Thank you bro. , I have saw this video for first time and I very like it and but I wished if you mentioned what the sub divisions mean such like : Sf , Mf , ... etc, thanks for your blessed effort
i just stumbled upon this video. You are so much clearer than that Al Tab guy!! He takes it so fast that you have to backup all the time. Anyways, thanks for the video. ETA: He doesn't even explain why he's doing something.
Thanks a lot for your comment. Everyone has their own strength and weaknesses. In terms of LS DYNA knowledge, I believe Al Tab has more experience. However, my tutorials are made for those who has zero knowledge in LS DYNA, that's why I try to explain as much as I can. :)
One more question. Say with the ball, if I have hit "accept" by mistake and can't change the settings for the ball, is there a way to delete the ball and start over? Thank you.
@@Ingeniero8206 I don't have a video on that but you can check the following presentation www.dynamore.de/de/fortbildung/konferenzen/vergangene/2018-ls-dyna-forum/forum-2016-de/m-02-schenke-dynamore-mod.pdf
Thank you so much Sir! Your help in learning this software is HUGE! Do you have something about erichsen cupping test on a circular specimen? Or maybe a tensile test on a welded specimen ?
You can check the following paper to see how to modeled the heat affected zone (HAZ) which was caused by welding: Truong (2020). Prediction of slamming pressure considering fluid-structure interaction. Part I_ numerical simulation
Hello! Your video is very helpful. I wnat to change the plate to glass(not aluminumn), so should I use 280-MAT_glass? If so, may I know what properties I should put in? Thank you!
I have a tutorial on the torsion test of brittle material. I used a different material model. But from that video you can learn where to search for material properties.
@@AmeenTopa Thank you for your answer! We changed the tutorial above 18-MAT_POWER_LAW_PLASTICITY to 210-MAT_GLASS. However, BOUNDARY_SPC doesn't catch the edge part. May I know what to do? Looking forward to hearing from you!
@@AmeenTopa Thnak you for your answer! I'm sorry, but it's not easy to find physical properties. Is there a way to find examples related to glass? I can't find examples related to glass anywhere....
@@윤재광-x4p You need to learn how to use Google. Type the following (including the quotation marks): "LS-DYNA" "GLASS" "MAT280" And the thesis below is one of the results: core.ac.uk/download/154833183.pdf Now, read that thesis. Then, check the references of the thesis for more reading materials. ALL THE BEST!
Hi, Dr Ameen, thank you for this vedio, do you know how to output the contact area during the impact? this question is killing me, I didn't find this in lsdyna, hope you can help, thanks!
Thanks for your video. It helps me a lot for beginner like me. While watching your simulation, i came up with two questions. 1) how much does the ball weigh? I've searched video and dyna's options but there is no options for mass (when making part) 2) what is the differences between density when you make model (below the radius) and one in material? Tahnks again
You are welcome. Please share my videos if you find them useful. To answer your question, you can check my tutorial: Reinforced Concrete and Wrecking Ball
Thank you for your great videos! One of the literal only step by step resources on LS-Dyna that's freely available. As a request could you do some more videos on ICFD and by extension FSI simulations? There are even fewer videos about those available.
You are most welcome. Unfortunately, I currently have very little time to create new tutorials on my channel. Most of my recently uploaded videos are from my old recordings. With that being said, if you are interested in an online consultation session, then you can contact my team and they will arrange the time.
Ameen,thanks for the lesson. Could you help me? I downloaded the student version LS-DYNA from the official site Ansys, and i only have Ls-PrePOST, LS-Run and LS-Dyna pOwer shell. I don't have LS-DYNA program manager.How can i solve this problem?
@Ameen Topa Thank you for the tutorial! Can we import the .k file into Workbench LS-DYNA? What is the difference between LS-DYNA in Workbench and the LS-DYNA Program Manager?
Hello there, using LS-PREPOST you will generate .k files which need LSDYNA manager or LSRUN to be solved. If not mistaken, LSDYNA WORKBENCH generates different a type of files.
Hi,Ameen. Thanks a lot for your fantastic videos. I have a question about the type of contact. If I set the ball as an elastic or plastic part und plate remains plastic behaviour, in this case which contact type should I use?
@@meinleben-v5l still no need to change the contact. But if the ball elements are expected to be eroded (deleted), then use CONTACT ERODING SURFACE TO SURFACE.
nice to get your reply, thanks a lot. By the way,do you think it is a safe way to have the automatic surface to surface for most common cases? @@AmeenTopa
Hello, I'm getting a lot of help from the video you uploaded. I'm a student who made an impact reducer with aluminum honeycomb and is doing a collision analysis. The condition I want is that a car weighing 3000N needs to absorb more than 7350j of energy in the event of a collision, is there any way to give weight to aluminum honeycomb? Thank you for the great video.
Thank you mr ameen.. The video was really helpful... But i have a doubt whether repeated loading on the cylinder concrete specimen can be simulated in ls dyna....????
Seismic analysis are not my field of area. You can find some good information in this link: www.lstc.com/applications/soil_structure/pml/implementation
thanks，Very useful, except that the video is a bit difficult to understand for people whose first language is not English, I wish there were subtitles!
Excellent work!; During solid sphere creation step, the input needed is position vector (x,y,z) and two direction vector such as direct1 and direct2 . What is the meaning of two direction vector in the solid sphere command? What is significance of the direction vectors? Thank you
I have not investigated this matter. But as far as I know, there is no effect as long as you make your mesh adequately sized. The way how pre post makes the sphere, is making a circle first, then rotate that circle around an axis which goes through it. I believe this is the meaning of the two vectors. The normal of the circle and the axis of rotation.
Hi Ameen, thank you for the useful video!! I was wondering why you changed from the Keyword Manager to the Create Entity button in order to define the boundaries. Was it necessary? Could I set the boundaries from the keyword manager? What is the difference?
Hi Ester, there is no reason. For me, it is easier to use create entity to define the boundary conditions. It can be done from keyword manager too. And they are no difference between the two of them...as far as I know.
HELLO MR AMEEN : THANK YOU VERY MUCH FOR YOU WONDERFUL VIDEOS JUST TWO QUESTIONS PLEASE : 1- HOW CAN I MODEL AND STIMULATE PERFECT IDEAL BOND BETWEEN STEEL AND CONCRETE 2- HOW CAN I DRAW STEEL SECTIONS ( IS THERE ANY READY SECTIONS " H , I . HOLLOW SECTIONS ...ETC ) THANKS IN ADVANCE
Hi Mr. Obada, 1- Can you explain more what do you mean by perfect ideal bond? If it is Steel Reinforced Concrete, then you use CONSTRAINED_LAGRANDE_IN_SOLID 2- You can simply draw any of those shapes, and then extrude them like any CAD software. As far as I know, there is no ready sections.
hi mr ameen : first ; is it posibble to give me you email : i mean perfect bond betgween steel bar and concrete , have you got any model for r.c to check it , to train to fill data in CONSTRAINED_LAGRANDE_IN_SOLID thanks in advance mr ameen i really appreciate your efforts
Hello Ameen Sir, I am learning LS-Dyna from very basics and your videos are incredible. I have a very basic question, how can I attach few nodes from one part with few nodes of another part so that they remain attached when I collide it with something? I don't know where to find this.
Make a full sphere then delete half of it. I recommend you to watch my playlist "Mesh it with PREPOST" there are lots of video that might help. Biased mesh of square plate, search this video in my channel. I have shown there how to make a hemi sphere.
Bro, please do 1000 - billions of tutorial videos on LS DYNA, and please don't forget to upload the model files that you are using in each and every tutorial videos in the youtube
Bro, please do more car crash test tutorials and do trillions of live training sessions on LS DYNA CAE from basic to professional level . I support all your content
You are welcome. Unfortunately, I am not a full time RUclipsr. I have a full time job as a consultant. If you need any personal training, I am available for paid consultation. 😁
Hello, Ameen, do you mind if I post this course translated into Russian on my channel? I would be grateful if you allow me to do this P.S. I will definitely credit you as the author of the original video.
What you need is covered in my tutorials. If you watch them all, then you will be able to do it yourself. If there is possibility for research collaboration, then we can contact further and I can guide you,.
Hi Ameen thank you for the tutorial, when I run the model my plate did not tear it just crept. and I used inivel for the velocity assignment instead of 'initial>>velocity' but I got 'node out of range velocity' error. What is the problem:(
There are few things that you can check: - The velocity is assigned to the bullet not to the target - The value of velocity is not extremely high (check the units) - The material properties (check for typos) The above three are general tips. I need more information to give a more useful answer. For more tips, check out my blog entry here: lsdynauniverse.blogspot.com/2021/03/instabillities-in-explicit-analysis.html
Depends on the actual case that you want to model. If you have a spherical projectile, then no need to add mass, just follow the example. But, if your impactor is a cylinder with a hemispherical end, and you model only a sphere, then you need to increase the mass to match the mass of your cylindrical impactor.
@@AmeenTopa I mean let's say I'm modelling a rebar which is meshed into 100 elements. And later on I wanted to mesh it into 30 elements for example. Is it possible to make those 100 elements as 1 element so I can re-mesh it into 30 elements ?
sir please clear my doubt, what is the unit of mass density(RO) at 4:32 . i saw the density of aluminium around 6.7 g/cm3, to which unit the conversion is made?
Sure. Is there anyway to modify the parts? Lets say that after you saw the results, you would like to move the ball position, or increase/decrease the meshing resolution of the plate. How can you do that? Thanks in advance, kindly.
Yes. To change the position of the parts, you go to Element Tools, then Choose Transform, click on Translate, enter the axis, n distance and select the elements you want to move. To refine the mesh, go to Element Tools, Element Editing.
The only part that may be tricky is how to define the motion of the drill. You can do that with prescribed motion option. Other commands are straight forward.
This video is the first is the playlist: LS-DYNA BASIC TUTORIALS. Watch all the videos on that list and you will be able to do the bullet vs body armor simulation.
Hello Ameen, I think I did everything like you have shown on your video, but my alimunum plate is not broken after impact. So the deformations was just increasing and increasing during test but there is no failure. I have checked the failure strain EPSF in my model and it is 0.4876 as you shown. Where I was wrong?
No. The ball will travel at the given initial velocity until it hits the target. This is because we didn't define gravity in this example (it is not needed here). To see how to define gravity, check my tutorial on Reinforced Concrete and Wrecking Ball.
@@AmeenTopa I am doing project on low velocity impact analysis on aluminium 6061, can you help me? Like how to plot graphs like force vs displacement and velocity vs time. Thank you
Thank you for the nice tutorial, can you help me with these error? " Error 20389 (STR+389) thin shell element 10001 references part number 2 that does not reference a thin shell section" (this error start from 10001 untill 10050 ) and this error "Error 20230 (STR+230) element ID 10001 has a nodal thickness that is less than or equal to zero." i have student version...
Hello, I am trying to do a similar case but the master PID where s ball impacts it's made of rubber. Do you know what kind of MAT I could define if I expect that the master PID will fail?
@@AmeenTopa thank you, I've checked previously too but my model fails because the impact ball requires high velocity. In this example the velocity is low so there is no failure. I appreciate your answer, thank you.
@@alvarogarciamendez6147 to add failure of the material, you may use MAT ADD EROSION. As far as I know, there is no hyper elastic material model in LS-DYNA that has a built-in failure criteria.
1:10 I want to make a rigid plate of the length 914.4mm and width 609.5 and thickness 6.35mm. How do I input my numbers here in this coordinate system to make this plate?
It simply depends on how thick you want your plate to be. If you want the plate to be 3mm thick, then you put this value on T1,T2,T3,T4 in Section Shell
@@AmeenTopa I am actually designing a Side Under Ride Guard for a truck. So for the guard is 100mm thick and 20 feet wide. So for T1,T2,T3,and T4 can I use 100mm?
@@manojdanthuluru7913 Yes, shell elements are suitable for plate structures. Thin plates are measured by its slanderness ratio which is the ratio of its length to its thickness. In your case, the width is 20 feet which is much more larger than the thickness.
Hello Ameen, I followed the exact same steps as you, but the velocity of the ball stayed constant after impacting the plate. How do I change it that the velocity of the ball decreases after impact?
sir, if the material used is isotropic elastic plastic, do I need to key in all the parameters, or is there any parameters that compulsory to be filled in order for the simulation to work?
Hi sir, can we do repeated impact on one plate, that is the hammer shld hit the surface of plate and come back to original place and again hit the plate and the process shld continue until the plate fails.!?? Can you please help me with this
Yes. You can have use multiple stage simulations approach. Check out my springback tutorial to see how to do this method. Another way is to make more than one hammer, then apply the velocity on all of them and put them behind each other so they hit the target plate at different times.
Hello Can you axplain destruction conditions in this tutorial? and may be you have some literature about this? And one more...do you have information about Johnson Cook's model in LS-DYNA?
Failure strain is the criterion used in this tutorial. Literature are abundant online regarding material failure in LS Dyna. Material constant for Johnson Cook's model are available at: www.varmintal.com/aengr.htm
There is no direct way to set the units. The main thing, is you have to be consistent and follow a set of units. Check the following link: www.dynasupport.com/howtos/general/consistent-units
Hello sir I follow the same procedure as you explain ball also hit the plate but it's not crossing the plate. In my case ball hit plate again bounce back.. can you plz clear me where I made mistakes
It could be a problem in the material properties (such as you didn't define failure strain), the thickness of the plate is incorrect, or the ball velocity is too slow for full penetration.
@@mrpigeonalt4371 this "full speed" is not the actual speed in our real life. The simulation time is only about 10 milliseconds. This means the whole impact and bouncing that you see should occur in that short period of time.
Can you help me ? Same example but hypervelocity impact: I have the following issue: the intruder going trough the plate without breaking it; it’s like the plate can’t see the intruder. How can i solve ? My Vz is 1 km/s
@@grf00 if it is exactly similar to my example except for the velocity, then you need smaller timestep size. In CONTROL TIMESTEP, set TSSFAC = 0.1. or 0.01.
@@AmeenTopa thank for the answer. Time step is ok, in fact the problem is that during the simulation the intruder is like a ghost for the plate, it going through the plate “without touching it” (physically impossibile). I think that I have to change the material card or the number of nodes
@@grf00 your answer does necessarily mean that the timestep size is small. I am here talking about the calculation time step, not the output time step, which is something different. The higher the velocity, the smaller the needed timestep size. In my example, it is low velocity, so the default timestep size calculated is sufficiently small. In your case, it is high velocity, so you need a smaller timestep size. This can be achieved by either having smaller element size, or by following my first answer.
Hello everyone. I have a question. I am making strain plot to compare with the test results. I need to select elemental history plot strain. I have lower or upper ipt strain options. How do I know which one is on the strain gauge side surface? I mean how do we know which side is upper and which one is lower? Thanks.
I believe this depends on the normal of the shell elements. The normal will be pointing outward of the shell surface, which is the upper integration point.
@@AmeenTopa So positive normal is upper. I read integration point is not the same as surface but you can integrate on the surface via extra command. Thank you! 🙂
@@31.trianurhalizah76 have you tried running another model? You can get a sample file from dynaexamples.com This is just to confirm that you have installed the software correctly.
You can create the 3d geometry with any CAD software (like SOLIDWORKS) then import the igs file to LS-Prepost and mesh it with the tetrahedron Mesher tool. I discussed this in one of my videos in the playlist that I give to you in my previous comment.
@@AmeenTopa I want to ask you . When I build a 2d model in autocad and changed it to .igs but why I still can't open the igs file in Ls dyan. error : Can't import . :(
hello, your videos are incomparable... please help with this problem. when animating the rupture of the plate from your first lesson with the display of a stress diagram or stresses while waiting for the moment of rupture, the program crashes. without showing the stresses, the moleling occurs safely to the end. what could this be related to? perhaps a weak pc? thanks.
@@AmeenTopa Hello! It's a great job!! Thank you so much for your videos and lessons. Excuse me, but could you help me? Please tell me which type of material is better to choose for EPP (Expanded Polypropylene) material. It is used as an energy-absorbing material, in particular as an organizer in the trunk of cars for tools, as well as for inserting under the bumper. I know its characteristics (Young's modulus, density, Poisson's ratio and there is an experimental stress-strain curve). I am very grateful to you in advance.
brother ameen, i have met a problem during running a helmet imapact sim. the whole model with anvil, shell, foam liner and a head model. when the foam liner using original thickness and the acceleration is acceptable, but when i reduce the thickness of the liner so the head will crush the liner and impact the anvil, and the Z-acceleration of the model has surged to a illogical number, also the liner elements will deform and penetrate to the head model. how can i solve this problem
I think the liner is made of soft materials such as rubber or form. If that's the case, then watch my tutorial 3 points bending test. Also, check the materials in the description of that video.
@@AmeenTopa thank u so much ameen, i have one more question that before setting the contact_interior card for eps foam, the da2 and da4 in the foam set_part was set to 0.1 and 2, what does it mean? i've check the mannual but still not have a clue
I don't have a mouse, so I was using my laptop's keypad to do everything, till you selected the edges for the boundary conditions. As soon as I tried to select by click on the left button, it tries to rotate the view, rather than selecting anything. I'm stuck and don't know what to do. Please help.
@@AmeenTopa I selected the top view, but the selection wasn't happening, only rotating and panning were happening using left and right click respectively.
This is just a basic tutorial. The properties used are standard values which you can find in any text book. Check out my cylinder compression tutorial to see where you can find the properties of different grades of metals and alloys.
Dear Javeeth, You can check the following resources: www.dynaexamples.com/examples-manual/misc/airbag www.lstc.com/lspp/content/pages/3/airbag/airbag.shtml ruclips.net/video/4b9wiPE0sSw/видео.html ruclips.net/video/-ExfDi0uCYo/видео.html www.dynamore.de/de/download/papers/forum07/forum07/keynote/airbag-simulation-with-ls-dyna-past-2013-present www.dynalook.com/14th-international-ls-dyna-conference/modeling/roof-rail-airbag-folding-technique-in-ls-prepost-r-using-dynfold-option
You need to purchase the LS-DYNA license from LSTC and they will give you the program manager. Alternatively, you can check my tutorial on how to get the LS-DYNA students version. It comes with LS-RUN which functions like the program manager.
by far, it was the best tutorial of LS-DYNA in the youtube. thank you very much
You are welcome. Please share my videos so more people in the middle East can learn the software 😬😬😅
Mr Ameen, thanks for sharing your knowledge!!! Really appreciated!!! keep doing great job
most welcome!
Great you are doing well I am following you from a long time. I am a cae engineer from India
Good. I hope you learn something from my videos. Please share my channel so more people can learn ☺️☺️
Thank you bro. , I have saw this video for first time and I very like it and but I wished if you mentioned what the sub divisions mean such like : Sf , Mf , ... etc, thanks for your blessed effort
You are welcome. Please elaborate which keyword card you are referring to?
i just stumbled upon this video. You are so much clearer than that Al Tab guy!! He takes it so fast that you have to backup all the time. Anyways, thanks for the video.
ETA:
He doesn't even explain why he's doing something.
Thanks a lot for your comment. Everyone has their own strength and weaknesses. In terms of LS DYNA knowledge, I believe Al Tab has more experience. However, my tutorials are made for those who has zero knowledge in LS DYNA, that's why I try to explain as much as I can. :)
Please do share my tutorial within your circles. Thanks
One more question. Say with the ball, if I have hit "accept" by mistake and can't change the settings for the ball, is there a way to delete the ball and start over? Thank you.
I found the delete but how would I edit it?
This is simply amazing! You make learning this software really exciting. Thank you so much.
You are welcome. Please share my videos so more people can learn. :D
Do you have any video on contacts or modeling screws in a steel beam? Thanks for sharing 👍. good video.
@@Ingeniero8206 I don't have a video on that but you can check the following presentation
www.dynamore.de/de/fortbildung/konferenzen/vergangene/2018-ls-dyna-forum/forum-2016-de/m-02-schenke-dynamore-mod.pdf
@@AmeenTopa Thank you, greetings from Chile 👍
Great explained in a very simple way .... Thanks a lot for your efforts in making this video Mr.Ameen
It's my pleasure. Please check out my other tutorials and don't forget to recommend my channel if you like my content. :D
Thank you brother!!! It was very helpful. Hope you continue with some complex part set impact.
You can check my other tutorials. You will get the enough basics to do most of beginners to medium level simulations
Great video for beginners. Thank you.🤝
I am glad you found it useful. Make sure to follow the rest of the videos in the playlist.
thank you for the video..this is my first simulation... clear presentation 👍👍🙂
you are welcome, please share my videos if you benefit from them!!
Thank you so much Sir! Your help in learning this software is HUGE!
Do you have something about erichsen cupping test on a circular specimen?
Or maybe a tensile test on a welded specimen ?
You can check the following paper to see how to modeled the heat affected zone (HAZ) which was caused by welding:
Truong (2020). Prediction of slamming pressure considering fluid-structure interaction. Part I_ numerical simulation
This is really helpful. Thank you very much
I am glad you found my work helpful. Please check my other videos.
Hello! Your video is very helpful. I wnat to change the plate to glass(not aluminumn), so should I use 280-MAT_glass? If so, may I know what properties I should put in? Thank you!
I have a tutorial on the torsion test of brittle material. I used a different material model. But from that video you can learn where to search for material properties.
@@AmeenTopa Thank you for your answer! We changed the tutorial above 18-MAT_POWER_LAW_PLASTICITY to 210-MAT_GLASS. However, BOUNDARY_SPC doesn't catch the edge part. May I know what to do? Looking forward to hearing from you!
I believe that the BOUNDARY SPC is working but the plate is breaking at the edges.
@@AmeenTopa Thnak you for your answer! I'm sorry, but it's not easy to find physical properties. Is there a way to find examples related to glass? I can't find examples related to glass anywhere....
@@윤재광-x4p You need to learn how to use Google.
Type the following (including the quotation marks):
"LS-DYNA" "GLASS" "MAT280"
And the thesis below is one of the results:
core.ac.uk/download/154833183.pdf
Now, read that thesis. Then, check the references of the thesis for more reading materials.
ALL THE BEST!
Simple demo of a simple problem shown well. Good one. Please share even higher level and more complex problems when you make more such demos.
Thank you very much. I am planning to make a new demo soon.
Hi, Dr Ameen, thank you for this vedio, do you know how to output the contact area during the impact? this question is killing me, I didn't find this in lsdyna, hope you can help, thanks!
Thanks for your video. It helps me a lot for beginner like me. While watching your simulation, i came up with two questions.
1) how much does the ball weigh? I've searched video and dyna's options but there is no options for mass (when making part)
2) what is the differences between density when you make model (below the radius) and one in material?
Tahnks again
You are welcome. Please share my videos if you find them useful.
To answer your question, you can check my tutorial: Reinforced Concrete and Wrecking Ball
You are doing a good job, sir! Thank you very much for that! :)
Thank you very much. Please do like, share, and subscribe to my channel.
Thank you for your great videos! One of the literal only step by step resources on LS-Dyna that's freely available.
As a request could you do some more videos on ICFD and by extension FSI simulations? There are even fewer videos about those available.
You are most welcome.
Unfortunately, I currently have very little time to create new tutorials on my channel. Most of my recently uploaded videos are from my old recordings.
With that being said, if you are interested in an online consultation session, then you can contact my team and they will arrange the time.
Thanks Dear Ameen Sir,
We wish to watch more and more tutorials from you.
This is the first tutorial in a series of 21 videos. Watch them all and you will learn the software!
Ameen,thanks for the lesson. Could you help me? I downloaded the student version LS-DYNA from the official site Ansys, and i only have Ls-PrePOST, LS-Run and LS-Dyna pOwer shell. I don't have LS-DYNA program manager.How can i solve this problem?
You need to run the files with LS-RUN as I showed in my video on how to install the student version.
@@AmeenTopa thank you! I try to do this!
Excellent video for beginners! Great work.
Thanks, I am glad it is helping someone.. :D
@Ameen Topa Thank you for the tutorial! Can we import the .k file into Workbench LS-DYNA? What is the difference between LS-DYNA in Workbench and the LS-DYNA Program Manager?
Hello there, using LS-PREPOST you will generate .k files which need LSDYNA manager or LSRUN to be solved. If not mistaken, LSDYNA WORKBENCH generates different a type of files.
@@AmeenTopa understand, thank you for the prompt reply!
Such a simple and clear explanation! Great Job!
Glad it was helpful! Please share my videos so more people can benefit! :D
Thank you Mr. Ameen Topa for a clear and informative video. May i know what should be the minimum system specification needed for this simulation?
This depends on the size of the your keyword file. Usually the files in my tutorials, I keep them small so that everybody can follow!
Thanks for the relevante class , excelent
You are welcome. Please share my videos if you find them useful!
Hi,Ameen. Thanks a lot for your fantastic videos. I have a question about the type of contact.
If I set the ball as an elastic or plastic part und plate remains plastic behaviour, in this case which contact type should I use?
If you only change the material type then no need to change the contact.
what happens with the contact typ if I use solid mesh for ball and shell element for plate? thnaks a lot in advance! @@AmeenTopa
@@meinleben-v5l still no need to change the contact. But if the ball elements are expected to be eroded (deleted), then use CONTACT ERODING SURFACE TO SURFACE.
nice to get your reply, thanks a lot. By the way,do you think it is a safe way to have the automatic surface to surface for most common cases? @@AmeenTopa
@@meinleben-v5l yes, for most applications, CONTACT AUTOMATIC SURFACE TO SURFACE will work.
I always answer the questions in the comment section. 🙂
Can we please make a video on frontal vehicle crash test with wall
or recommend some course to learn ls dyna for checking crashworthiness of vehicles
Check my tutorial on Car Collision.
Good Job Sir
Thanks! Please share my videos so more people can benefit from my free tutorials. :)
I subscribed right away. Excellent explanations.
Awesome, thank you! Please share my videos so more people can learn!
Very nice
Thank you cat man. Please share my videos if you find them useful. 😃
Hi it was great. it helped me as a beginner.
Great to hear! Please share my videos so it can reach more people!
Hello, I'm getting a lot of help from the video you uploaded.
I'm a student who made an impact reducer with aluminum honeycomb and is doing a collision analysis. The condition I want is that a car weighing 3000N needs to absorb more than 7350j of energy in the event of a collision, is there any way to give weight to aluminum honeycomb?
Thank you for the great video.
You can increase the density of the material to increase the weight.
Thank you for simplicity!
You are welcome! If you are new to my channel, please subscribe and share my channel so it reaches more people!
very helpful. thank you, sir!
You are welcome. Check out my other tutorials!
Excellent Professor!!! Thank you!
You are welcome, I am glad my video is helping.. :D
Thank you mr ameen.. The video was really helpful... But i have a doubt whether repeated loading on the cylinder concrete specimen can be simulated in ls dyna....????
Yes, of course it can.
Can u help me to model it sir??
@@kaverikalai3560 drop your email here and I will contact you. I cannot help you if I don't know the details.
@@AmeenTopa kalaikaveri95@gmail.com thz is my email id sir...
thank you very much, a nice, informative tutorial
You are welcome! I am glad you found it useful. Please check my other videos and don't forget to subscribe to my channel! :D
Nice tutorials, sir! Please make tutorial on seismic analysis in ls dyna. Thank you
Seismic analysis are not my field of area. You can find some good information in this link:
www.lstc.com/applications/soil_structure/pml/implementation
Great job brother
Thanks, i hope you learned something. Please share my videos so more people can benefit and learn.
@@AmeenTopa yes brother , this 1st video helped me a lot ..
Keep doing this great job❤
Glad to know that. 👍👍
thanks，Very useful, except that the video is a bit difficult to understand for people whose first language is not English, I wish there were subtitles!
You are welcome. There is the auto generated subtitles by RUclips.
In this video, the unit system for mass is expressed in kilograms (kg), but how should I configure the settings to convert this to tons or kgf·s²/mm?
@@ポルポルポル you may check this website: www.dynasupport.com/howtos/general/consistent-units
Excellent work!; During solid sphere creation step, the input needed is position vector (x,y,z) and two direction vector such as direct1 and direct2 . What is the meaning of two direction vector in the solid sphere command? What is significance of the direction vectors?
Thank you
I have not investigated this matter. But as far as I know, there is no effect as long as you make your mesh adequately sized.
The way how pre post makes the sphere, is making a circle first, then rotate that circle around an axis which goes through it. I believe this is the meaning of the two vectors. The normal of the circle and the axis of rotation.
Hi Ameen,
thank you for the useful video!!
I was wondering why you changed from the Keyword Manager to the Create Entity button in order to define the boundaries. Was it necessary? Could I set the boundaries from the keyword manager? What is the difference?
Hi Ester, there is no reason. For me, it is easier to use create entity to define the boundary conditions. It can be done from keyword manager too. And they are no difference between the two of them...as far as I know.
@@AmeenTopa thank you a lot!!
Great tutorial! Thankyou!
Thanks! Please share my channel so it can reach more people
HELLO MR AMEEN :
THANK YOU VERY MUCH FOR YOU WONDERFUL VIDEOS
JUST TWO QUESTIONS PLEASE :
1- HOW CAN I MODEL AND STIMULATE PERFECT IDEAL BOND BETWEEN STEEL AND CONCRETE
2- HOW CAN I DRAW STEEL SECTIONS ( IS THERE ANY READY SECTIONS " H , I . HOLLOW SECTIONS ...ETC )
THANKS IN ADVANCE
Hi Mr. Obada,
1- Can you explain more what do you mean by perfect ideal bond? If it is Steel Reinforced Concrete, then you use CONSTRAINED_LAGRANDE_IN_SOLID
2- You can simply draw any of those shapes, and then extrude them like any CAD software. As far as I know, there is no ready sections.
hi mr ameen : first ; is it posibble to give me you email :
i mean perfect bond betgween steel bar and concrete , have you got any model for r.c to check it , to train to fill data in CONSTRAINED_LAGRANDE_IN_SOLID
thanks in advance mr ameen
i really appreciate your efforts
Thanks
Welcome
Sir please make a video of blast test, and a air soil interaction in blast with detonation
Yes coming soon. For now, you can check my blast wall tutorial! :D
Hello Ameen Sir, I am learning LS-Dyna from very basics and your videos are incredible.
I have a very basic question, how can I attach few nodes from one part with few nodes of another part so that they remain attached when I collide it with something? I don't know where to find this.
You can try tiebreak contact.
@@AmeenTopa Thanks! also do you have any video in which you attached something similar to this so I can better understand?
@@sanskarsogani3137 Check out my tutorials:
- Hollow Tube Impact on a Rigid Wall
- Delamination and Cohesive Zone
@@AmeenTopa Thanks Sir!
@@sanskarsogani3137 No problems. Please support my channel so I can keep uploading more good videos. Share this video with you friends and colleagues.
thank you for the tutorial, can I know how to construst a hemisphere model?
Make a full sphere then delete half of it. I recommend you to watch my playlist "Mesh it with PREPOST" there are lots of video that might help.
Biased mesh of square plate, search this video in my channel. I have shown there how to make a hemi sphere.
@@AmeenTopa thank you, it helps a lot 😁
Bro, please do 1000 - billions of tutorial videos on LS DYNA, and please don't forget to upload the model files that you are using in each and every tutorial videos in the youtube
And I support your content bro
Bro, please do more car crash test tutorials and do trillions of live training sessions on LS DYNA CAE from basic to professional level . I support all your content
Your channel has all the clear contents on LS DYNA . Please do Btrillions of videos on it.
You are welcome. Unfortunately, I am not a full time RUclipsr. I have a full time job as a consultant.
If you need any personal training, I am available for paid consultation. 😁
Bro I know but I am asking you to make videos in your channel when you are free that is my only request
Hello, Ameen, do you mind if I post this course translated into Russian on my channel? I would be grateful if you allow me to do this
P.S. I will definitely credit you as the author of the original video.
Yes sure. As long as proper credits are given, I don't mind.
Thanks for your efforts in translation.
Sir plz make video on how to apply 10g or any other acceleration on GHBMC or any other body to check it's effect on body parameters
What you need is covered in my tutorials. If you watch them all, then you will be able to do it yourself.
If there is possibility for research collaboration, then we can contact further and I can guide you,.
@@AmeenTopa ok I will go through it, thanks for ur reply, surely i will reach u soon.
It's fantastic! Thank you!
Thank you too! Please share my videos if you find them useful!
Great Ameen, keep it up bro.
Thanks! please share my channel so more people can benefit!
Hi Ameen thank you for the tutorial, when I run the model my plate did not tear it just crept. and I used inivel for the velocity assignment instead of 'initial>>velocity' but I got 'node out of range velocity' error. What is the problem:(
There are few things that you can check:
- The velocity is assigned to the bullet not to the target
- The value of velocity is not extremely high (check the units)
- The material properties (check for typos)
The above three are general tips. I need more information to give a more useful answer.
For more tips, check out my blog entry here:
lsdynauniverse.blogspot.com/2021/03/instabillities-in-explicit-analysis.html
Hi , should we apply mass to the impactor i,e ball or mass density is enough
Depends on the actual case that you want to model. If you have a spherical projectile, then no need to add mass, just follow the example.
But, if your impactor is a cylinder with a hemispherical end, and you model only a sphere, then you need to increase the mass to match the mass of your cylindrical impactor.
nice work Ameen
would ou make tutorial about drilling please or provide documantations
ruclips.net/video/I3A96om3a20/видео.html
@@AmeenTopa thanks a lot Ameen
My question is not correlating to the video, but I hope you can answer.
Is it possible to merge beam elements ?
Thanks for your time!
Beam elements are made of nodes. You can merge (connect) them using Merge Duplicate Nodes. The beams will be merged at the overlapped nodes.
@@AmeenTopa I mean let's say I'm modelling a rebar which is meshed into 100 elements. And later on I wanted to mesh it into 30 elements for example. Is it possible to make those 100 elements as 1 element so I can re-mesh it into 30 elements ?
sir please clear my doubt, what is the unit of mass density(RO) at 4:32 . i saw the density of aluminium around 6.7 g/cm3, to which unit the conversion is made?
In this video, I am using kg and mm3. So, aluminum density is 6700 e-9 kg/mm3.
Great initiation tutorial, thank you.
You are most welcome. Please do like and share my videos so everyone can benefit!
Sure.
Is there anyway to modify the parts? Lets say that after you saw the results, you would like to move the ball position, or increase/decrease the meshing resolution of the plate. How can you do that?
Thanks in advance,
kindly.
Yes.
To change the position of the parts, you go to Element Tools, then Choose Transform, click on Translate, enter the axis, n distance and select the elements you want to move.
To refine the mesh, go to Element Tools, Element Editing.
Ameen Topa Thanks, man!
You are most welcome bro.
Nice tutorial, have you done a video of composite drilling analysis in LS- DYNA ?
No. I can do a video of a normal drilling. But not composite drilling.
could share me the steps for drilling in ls dyna ?
The only part that may be tricky is how to define the motion of the drill. You can do that with prescribed motion option. Other commands are straight forward.
Sir, please make a video on bullet penetrating a body armour
This video is the first is the playlist: LS-DYNA BASIC TUTORIALS. Watch all the videos on that list and you will be able to do the bullet vs body armor simulation.
Hello Ameen, I think I did everything like you have shown on your video, but my alimunum plate is not broken after impact. So the deformations was just increasing and increasing during test but there is no failure. I have checked the failure strain EPSF in my model and it is 0.4876 as you shown. Where I was wrong?
There maybe few reasons: velocity of the projectile is less, the thickness of the plate is higher, the density of the material is not high enough...
Sir does height of the ball makes difference like if we take different height does the result changes
No. The ball will travel at the given initial velocity until it hits the target. This is because we didn't define gravity in this example (it is not needed here).
To see how to define gravity, check my tutorial on Reinforced Concrete and Wrecking Ball.
@@AmeenTopa I am doing project on low velocity impact analysis on aluminium 6061, can you help me?
Like how to plot graphs like force vs displacement and velocity vs time.
Thank you
@@AmeenTopaAnd for material properties of plate , what should I use
Johnson crook or the property used in the video, sir please reply
@@Mecharena188 this is no material model called Johnson Crook 😂😂😂
Using the same material model as in this video is fine for low velocity impacts.
@@AmeenTopa ok thank you sir
Thank you for the nice tutorial, can you help me with these error? " Error 20389 (STR+389)
thin shell element 10001 references part number 2
that does not reference a thin shell section" (this error start from 10001 untill 10050 ) and this error
"Error 20230 (STR+230)
element ID 10001 has a nodal thickness
that is less than or equal to zero." i have student version...
You are mixing between shell and solid elements.
For part ID 2, you created solid elements but you defined SECTION SHELL for it (or vice versa)
Hello, I am trying to do a similar case but the master PID where s ball impacts it's made of rubber. Do you know what kind of MAT I could define if I expect that the master PID will fail?
@@alvarogarciamendez6147 check out this example:
lsdyna.ansys.com/contact-rubber/
Take note that a different unit system is used in this example..
@@AmeenTopa thank you, I've checked previously too but my model fails because the impact ball requires high velocity. In this example the velocity is low so there is no failure. I appreciate your answer, thank you.
@@alvarogarciamendez6147 to add failure of the material, you may use MAT ADD EROSION.
As far as I know, there is no hyper elastic material model in LS-DYNA that has a built-in failure criteria.
1:10 I want to make a rigid plate of the length 914.4mm and width 609.5 and thickness 6.35mm. How do I input my numbers here in this coordinate system to make this plate?
The plate has four corners. You need to put the x,y,z location of each corner.
Hey Mr.Ameen, can you please tell me how do you decide on what thickness value to use in the section ID for a part?
It simply depends on how thick you want your plate to be. If you want the plate to be 3mm thick, then you put this value on T1,T2,T3,T4 in Section Shell
@@AmeenTopa I am actually designing a Side Under Ride Guard for a truck. So for the guard is 100mm thick and 20 feet wide. So for T1,T2,T3,and T4 can I use 100mm?
@@manojdanthuluru7913 Yes, shell elements are suitable for plate structures. Thin plates are measured by its slanderness ratio which is the ratio of its length to its thickness. In your case, the width is 20 feet which is much more larger than the thickness.
Hello Ameen, I followed the exact same steps as you, but the velocity of the ball stayed constant after impacting the plate. How do I change it that the velocity of the ball decreases after impact?
It could be that the shell thickness is very small.
it is showing me solver not selected what does that mean after importing running the solution? and how to select one in this simulation
this means you have not completed setting up the solver yet.
@@AmeenTopa but u haven't setup solver in the tutorial can you tell me where did u setup it in the video?
@@rushikeshattarde9431 you need to go to tabs in the manager: Solver, Select LS-DYNA solver
Hi Ameen, whats the difference between VELOCITY & VELOCITY GENERATION type control?
Velocity Generation is like an updated version of Velocity where you have more options. That's all.
sir, if the material used is isotropic elastic plastic, do I need to key in all the parameters, or is there any parameters that compulsory to be filled in order for the simulation to work?
You can check the keyword manual. It will indicates which parameters are necessary.
@@AmeenTopa thank you sir😁
@@AmeenTopa hi sir, I have conduct the simulation of ball impact on plate, how can I extract the data for displacement-force curve generation?
Check out my tutorial: "Post Processing Tutorial (with LS-Prepost)"
Hi sir, can we do repeated impact on one plate, that is the hammer shld hit the surface of plate and come back to original place and again hit the plate and the process shld continue until the plate fails.!??
Can you please help me with this
Yes. You can have use multiple stage simulations approach. Check out my springback tutorial to see how to do this method.
Another way is to make more than one hammer, then apply the velocity on all of them and put them behind each other so they hit the target plate at different times.
Thank you sir I will check and will return to you if any doubts.
Mr Ameen , How to change the units from m to mm or kg to gram ?
Watch my tutorial on torsion simulation. I have covered it there.
Hello
Can you axplain destruction conditions in this tutorial? and may be you have some literature about this?
And one more...do you have information about Johnson Cook's model in LS-DYNA?
Failure strain is the criterion used in this tutorial. Literature are abundant online regarding material failure in LS Dyna. Material constant for Johnson Cook's model are available at: www.varmintal.com/aengr.htm
why when I open ls run, the simulation results are not all zero, even though I have followed every step you explained in the tutorial?
There is must be an error in your model. Please check again. The example worked well for others.
thank you sir
You are welcome. Please share my videos so more people can learn.
hi mr ameen thanks for this video i want to know how to set the units in ls-dyna?
There is no direct way to set the units.
The main thing, is you have to be consistent and follow a set of units. Check the following link:
www.dynasupport.com/howtos/general/consistent-units
Hello sir I follow the same procedure as you explain ball also hit the plate but it's not crossing the plate.
In my case ball hit plate again bounce back.. can you plz clear me where I made mistakes
It could be a problem in the material properties (such as you didn't define failure strain), the thickness of the plate is incorrect, or the ball velocity is too slow for full penetration.
tbh its kinda funny especially at full speed it just goes "boing boing boing"
@@mrpigeonalt4371 this "full speed" is not the actual speed in our real life. The simulation time is only about 10 milliseconds. This means the whole impact and bouncing that you see should occur in that short period of time.
@AmeenTopa my bad it's still pretty funny with it looping
when defining contact rule the ssid msid and sstyp arnt there
I guess you are using the new LS-Prepost. For version 9.0 or higher, the slave and master are replaced by Surface A and Surface B.
Hello! Could you help me. How to create a parallelepiped and make a hole of a certain shape in it, such as a square hole
It is a bit complicated shape. You better use another CAD software to make this geometry then import it to LS-PREPOST in igs format
@@AmeenTopa i can't to subtract the volume of one shape from another?
Use the bolean tool. This must be done before the meshing step.
In my case, the resultant rigid body velocity have a constant horizontal line set at 20. Why this is happening?
I used LS RUN to solve the file.
Maybe the thickness of the plate or the material properties are incorrect.
@@AmeenTopa okk thanks
@@AmeenTopa And I want to perform one drop test and want to set acceleration. But there is no option of setting acceleration. How to do it?
Good job. Tanks
Thanks! Please share my videos so more can benefit!
Can you help me ? Same example but hypervelocity impact: I have the following issue: the intruder going trough the plate without breaking it; it’s like the plate can’t see the intruder. How can i solve ? My Vz is 1 km/s
@@grf00 if it is exactly similar to my example except for the velocity, then you need smaller timestep size. In CONTROL TIMESTEP, set TSSFAC = 0.1. or 0.01.
@@AmeenTopa thank for the answer. Time step is ok, in fact the problem is that during the simulation the intruder is like a ghost for the plate, it going through the plate “without touching it” (physically impossibile). I think that I have to change the material card or the number of nodes
@@grf00 how do you know the timestep size is okay?
First, try with lower velocity first (100/s) and see if it works or not.
@@AmeenTopa because in the simulation I can see the intruder going into the plate. Anyway thank you for your answeres!
@@grf00 your answer does necessarily mean that the timestep size is small. I am here talking about the calculation time step, not the output time step, which is something different.
The higher the velocity, the smaller the needed timestep size. In my example, it is low velocity, so the default timestep size calculated is sufficiently small. In your case, it is high velocity, so you need a smaller timestep size.
This can be achieved by either having smaller element size, or by following my first answer.
should the rigid body be as master surface instead of plate in this case?
I also have this query. Cause the ball is rigid.
The Master is the body that will be hit (target). The slave is the moving body. It does not necessary be rigid. It can be deformable also.
Ok. I see. Thank you!
Nope. Not necessary. If you want it to be deformable then it is okay also.
hi I need some help with MAT_ADD_EROSION for aluminium ball hitting aluminium plate gissmo model.
You can check this reference:
www.dynamore.de/de/download/papers/forum11/entwicklerforum-2011/haufe-gissmo.pdf
Hello everyone. I have a question. I am making strain plot to compare with the test results. I need to select elemental history plot strain. I have lower or upper ipt strain options. How do I know which one is on the strain gauge side surface? I mean how do we know which side is upper and which one is lower? Thanks.
I believe this depends on the normal of the shell elements. The normal will be pointing outward of the shell surface, which is the upper integration point.
@@AmeenTopa So positive normal is upper. I read integration point is not the same as surface but you can integrate on the surface via extra command. Thank you! 🙂
@@Kenan2730 Yes you are correct. No worries.
Hi sir, i am doing crushing simulations and some of the simulations just stop after one step. I am not able to figure out what is the reason.
Hi there. There could be many reasons: inconsistent units, not enough termination time, etc...
Sir, I have followed the tutorial that you taught, but why can't my program be run in LS Dyna Run?
What's the error?
@@AmeenTopa The program is terminated
I've tried fiddling with it but it still terminates
@@31.trianurhalizah76 have you tried running another model? You can get a sample file from dynaexamples.com
This is just to confirm that you have installed the software correctly.
How to fix if there is a warning in the section?
When I want to build a complex and difficult 3D model, how should I do it? Hope you reply
You can check my playlist: MESH IT WITH LS-PREPOST.
@@AmeenTopa Thank you, but I want to build a 3d model by myself, how do I do it? I feel like building that is quite difficult
You can create the 3d geometry with any CAD software (like SOLIDWORKS) then import the igs file to LS-Prepost and mesh it with the tetrahedron Mesher tool. I discussed this in one of my videos in the playlist that I give to you in my previous comment.
@@AmeenTopa That is useful knowledge. Thank you so much senior
@@AmeenTopa I want to ask you . When I build a 2d model in autocad and changed it to .igs but why I still can't open the igs file in Ls dyan.
error : Can't import .
:(
hello, your videos are incomparable... please help with this problem. when animating the rupture of the plate from your first lesson with the display of a stress diagram or stresses while waiting for the moment of rupture, the program crashes. without showing the stresses, the moleling occurs safely to the end. what could this be related to? perhaps a weak pc? thanks.
Hi there, maybe d3plot intervals are very small. Try increase the value of DT in BINARY D3PLOT
@@AmeenTopa Hello! It's a great job!! Thank you so much for your videos and lessons. Excuse me, but could you help me? Please tell me which type of material is better to choose for EPP (Expanded Polypropylene) material. It is used as an energy-absorbing material, in particular as an organizer in the trunk of cars for tools, as well as for inserting under the bumper. I know its characteristics (Young's modulus, density, Poisson's ratio and there is an experimental stress-strain curve). I am very grateful to you in advance.
@@vladimirlubimov2318 Check my tutorial on three point bending of sandwich structure. Also, check my publication about crushable foam.
@@AmeenTopa Thank you. I do it.
@@AmeenTopa sorry. Could you tell me where I can find a publication about crushable foam? can you provide a link, please?
brother ameen, i have met a problem during running a helmet imapact sim.
the whole model with anvil, shell, foam liner and a head model. when the foam liner using original thickness and the acceleration is acceptable,
but when i reduce the thickness of the liner so the head will crush the liner and impact the anvil, and the Z-acceleration of the model has surged to a illogical number, also the liner elements will deform and penetrate to the head model. how can i solve this problem
I think the liner is made of soft materials such as rubber or form. If that's the case, then watch my tutorial 3 points bending test. Also, check the materials in the description of that video.
@@AmeenTopa thank u so much ameen, i have one more question that before setting the contact_interior card for eps foam, the da2 and da4 in the foam set_part was set to 0.1 and 2, what does it mean? i've check the mannual but still not have a clue
@@AccelifeLiam check out this link: www.d3view.com/contact-interior-for-foams-honeycombs-and-rubbers/
@@AmeenTopa so much thanks to you ameen, you are my savior
Can you give the reference of the material properties of Aluminium?
Hi, watch my other videos where I mentioned about varmintal's engineering website.
What about ls-dyna_smp_s_R12_0_0_winx64_ifort170 file? You use it? Thx for the video!
I am using smp_d_R11. This is the latest version that I have.
@@AmeenTopa thx
no problem. Please share my videos so more can learn the software :)
I don't have a mouse, so I was using my laptop's keypad to do everything, till you selected the edges for the boundary conditions. As soon as I tried to select by click on the left button, it tries to rotate the view, rather than selecting anything. I'm stuck and don't know what to do. Please help.
To select the view, you can choose Top, Bottom, Right, or Left view of the bottom tool bar.
Only if you hold CTRL or SHIFT, then the view will rotate.
@@AmeenTopa I selected the top view, but the selection wasn't happening, only rotating and panning were happening using left and right click respectively.
@@bethechange5942 make sure your shift or ctrl are not being pressed. I work without a mouse sometimes and there are no problems.
What kind of aluminum is in the video?
This is just a basic tutorial. The properties used are standard values which you can find in any text book. Check out my cylinder compression tutorial to see where you can find the properties of different grades of metals and alloys.
Can u pls provide tutorial for air bag simulation in ls-dyna
Dear Javeeth,
You can check the following resources:
www.dynaexamples.com/examples-manual/misc/airbag
www.lstc.com/lspp/content/pages/3/airbag/airbag.shtml
ruclips.net/video/4b9wiPE0sSw/видео.html
ruclips.net/video/-ExfDi0uCYo/видео.html
www.dynamore.de/de/download/papers/forum07/forum07/keynote/airbag-simulation-with-ls-dyna-past-2013-present
www.dynalook.com/14th-international-ls-dyna-conference/modeling/roof-rail-airbag-folding-technique-in-ls-prepost-r-using-dynfold-option
How to install LS-Dyna program manager sir
You need to purchase the LS-DYNA license from LSTC and they will give you the program manager.
Alternatively, you can check my tutorial on how to get the LS-DYNA students version. It comes with LS-RUN which functions like the program manager.
Hello sir , when I click on run button I get error as " Restart file is not found"
What might be the issue?
d = d3dump is activated in the run command. Remove that!