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Dr. Michael Okereke - CM Videos
Великобритания
Добавлен 19 окт 2007
CM Videos is an educational channel that uses videos to help viewers create effective solutions to their computational modelling challenges. The channel features videos on many materials, computational modelling strategies and tricks and tricks about the use of computational modelling software. Also, lectures on different principles of computational modelling are delivered on the channel to help users understand the principles that drive computational modelling solutions.
The channel has two objectives: (1) to help as many people get into computational modelling irrespective of level of experience and exposure to computational modelling and (2) to offer effective solutions to computational modelling problems. To achieve the first goal, the channel creates contents that are pitched at a level that many users can engage with without assumptions made on level of expertise expected. For the later goal, effective ways of finding solutions are presented for advanced users.
The channel has two objectives: (1) to help as many people get into computational modelling irrespective of level of experience and exposure to computational modelling and (2) to offer effective solutions to computational modelling problems. To achieve the first goal, the channel creates contents that are pitched at a level that many users can engage with without assumptions made on level of expertise expected. For the later goal, effective ways of finding solutions are presented for advanced users.
What is behind the Finite Element Software you use?
This video explores what is behind the FE software that you currently use.
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TIME STAMPS
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📥* DOWNLOAD LINK TO SOFTWARE
1. PBCGen2D: A software for applying periodic boundary condition
Download softwaree: cmvideos.ck.page/products/pbcgen2dv1
2. PBCGenlite: A lite version of software for applying periodic boundary condition
Download software: cmvideos.ck.page/products/pbc-gen-lite-v1pt0
3. MontCarlGen2D: A software for creating random inclusions in 2D RVEs
Download software here: cmvideos.ck.page/products/montcarlgen2dv1
📹 RELATED VIDEOS
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1. Numerical Insights into Tensile Testing - ruclips.net/...
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TIME STAMPS
--------------------------------------
📥* DOWNLOAD LINK TO SOFTWARE
1. PBCGen2D: A software for applying periodic boundary condition
Download softwaree: cmvideos.ck.page/products/pbcgen2dv1
2. PBCGenlite: A lite version of software for applying periodic boundary condition
Download software: cmvideos.ck.page/products/pbc-gen-lite-v1pt0
3. MontCarlGen2D: A software for creating random inclusions in 2D RVEs
Download software here: cmvideos.ck.page/products/montcarlgen2dv1
📹 RELATED VIDEOS
-----------------------------------
1. Numerical Insights into Tensile Testing - ruclips.net/...
Просмотров: 261
Видео
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Sir, can you please provide a video tutorial for simulating eroding target and eroding projectile in abaqus
Noted. Thanks. I am not able to make this video.
Hello Professor, Greatly appreciated your efforts for us, Is it possible for you to cover Topology Optimization topic in future videos for us wheather in Ansys or Abaqus
Noted... thanks.
Dear Dr. Michael Okereke, have you done any modelling of the metal matrix composite using cohesive elements on the interface? thanks
If not, what is the default bond in ABAQUS between the particle and the matrix in this video? thanks
No... I haven't.
For this video, it was perfect bonding between the materials. It should give you the upper bound predictions.
hi, can i use a hyperfoam material in the python script which is based on 2000 test data? it seems like it is not possible to link the json file into .py-data and run in abaqus. do i have to dump the test data in the .py data to run in abaqus? or is running the script with noGUI-Task directly in python an option as well? How would you define the hyperfoam material? Do you have any documentation i can take a look into? greetings!
I do not have much experience to be able to offer any help.
Hello Dr.Michael,I'd like to ask you what your formula is in the Posson,s Ratio column in Excel
It's in the formula section of the Excel file.
Sir, very informative video. How to get stress strain curve at different strain rates?
You run the simulations for different strain rates typically different velocities and then follow same steps as in this video for every simulation.
Like to promote your the channel! Thank you very much! I wish all viewers good health peace and happiness!!!!!! I wish everyone happiness!!!
Thanks very much.
Can you please suggest any reference book pdf for it
I don't understand. Do you mean a pdf of my book? If so, I don't have it. Thanks.
@@MichaelOkereke ok sir
Thank you, Dr. Okereke, for always sharing your knowledge. I always enjoy watching your videos. Could you make a video about optimizing the shape of porous concrete blocks in terms of an interlocking mechanism, geometry, etc?
Thanks for the comment. I am not sure I understand the request, do you have a reference journal that I can read to better understand the problem?
@@MichaelOkereke Thank you, Dr. Allow me to send an email and explain further.
@@MichaelOkereke I have found a paper related to this subject, "Finite element modelling approach to determine optimum dimensions for interlocking concrete blocks used for road paving"
Didnt you set up contact properties ? or not necessary ?
I didn't use a contact property here. I assume perfect bonding between fibre and matrix. To be more accurate in your modelling, you probably need to incorporate some form of interface effect. I will not go with a contact property but this is possible, if you so desire but the better approach is to use an interface (cohesize zone/surface) effect.
@@MichaelOkereke Thanks for the answer
Thank you so much for the nice and detailed explanation
You are welcome.
Thank you so much
You are welcome.
is this linear or nonlinear ???
It should be nonlinear. Thanks.
@@MichaelOkereke where is the difference between linear and nonlinear in this Abaqus application? I'm working on ASTM D638 Type I analysis with synthetic resin material. but I was confused about entering material specifications and the summit process when I tried the error without success. Thankyouuu
can you compare it with girrafe neck effect? :)
Not sure about the 'girrafe neck effect'! Is it a real thing?
@@MichaelOkereke maybe if using yahoo translate instead of google translate? :) just found this term dog-bone in scoreflex trio brochure and have to find what is meaning :)
Great video, sir. Igbo kwenu.
Thanks and welcome
You are most welcome, as well, sir. Daalu.
thank you, Professor! it was very useful
Thanks for this. Glad it helped.
Hi Dr. Michael! I found really useful your video, I am doing my final degree project about RVE modelling and testing different materials. I followed all your videos and it helped me a lot. I don´t know if you could help me and say me what are the constraints and the BC for shear in plane XZ. That is what I have left. Thank you very much!
Glad it was helpful! Thanks for your kind comments. I have made an extensive video where I showed how to impose the shear loads (Pure shear). You can check out the whole video but if you start from the 13th minute, you will see description on imposing pure XZ shear through this link: ruclips.net/video/uzUQz4NPkEs/видео.htmlsi=IWr6puvLgTwuEZE9&t=792. Please let me know if you have any other queries. You can check other videos on shear loads, they might not be for UD composites as here but the implementation is still correct irrespective of the material under investigation.
@@MichaelOkereke Thank you very much, you have solved my doubt. It was very kind of you. Thanks!!!!!
Thanks for such informative tutorial. It helps me a lot. Sir, please explain the following input for an auxetic structure in dynamics explicit(Quasistatic ) in Abaqus CAE. 1. V=2mm/s, displacement of the model up to 30 mm. How can I apply both BCs at the same time or I am doing something wrong. 2. How von Mises stress is considered for different deformation values (Different nominal stress) for the same structure.
Hello @AmitSingh, thanks for the comment. 1. I will suggest if you want a pre-determined displacement of 30 mm, then input that directly using Static analysis. However, if you want to then run a dynamic analysis, then the ABAQUS Dynamic Explicit might do (but certainly not quasi-static). In that case, you may explore specifying velocity as V = 2 mm/s. In which case, if you want to achieve the 30 mm displacement, then your time-step will last for 15 seconds. It all depends on what you want to do. If you are more interested in the quasi-static analysis, then an ABAQUS Static General step will be okay and you simply specify the displacement as 30 mm. It makes analysis run quicker, easily and more accessible in terms of explaining the results. 2. In terms of Von Mises stress, I will think you are referring to homogenized (effective) stress state in the material. In the videos I make on this channel, I often extract the reaction forces attached to a retained node (where the displacement is applied). Using this, you want work out the normal stress (what you describe as nominal stress data). You can also calculate the strain which is displacement/gauge length. For this case, you would have to decide on what you want but changing the displacement would give you different nominal stress-strain values (as a homogenized value).
Ho Mr. Okereke Great video, i tried plot my curves, but i don't known what happen this is my structural model ruclips.net/video/bC9VyL4d6Sg/видео.html
Sir, can you please explain on how the PBC can be applied to a 3D model manually in abacus.
Noted. Thanks for the suggestion
How to find displacement at failure for Johnson cook model and damage parameters or fracture energy for the same
This video should help you: ruclips.net/video/gpSh2KLWnqk/видео.html
@@MichaelOkereke Sir what about damage parameters
I specified these values in my FEM Applications textbook. If you can find it, it will help you identify damage parameters for a Johnson-Cook model for steel. Here is the link to the book: link.springer.com/book/10.1007/978-3-319-67125-3
Despite signing in, the Poster Template is not available for download
Please try this link and search for the video title, you would see a link to click yo download extra resources here: www.cmvideos.org/downloadable-resources/
how can we do structural analysis of fdm printed part and what should be the failure criteria!!
I think it can be done as any normal simulation of a lattice structure but just allow the material to experience failure. Please look at my videos for guidance.
That is a very helpful and detailed video Michael, I am writing my first paper in 4 years and got some good insights from your video. Also, to get many citations you actually have to work on a topic that is hot at the moment and also in the coming years!
Thanks Ronald. I am glad you found some ideas in the video helpful. Good luck with the new paper. You are right about 'working on a hot topic' to get more citations. This is true, and I referenced to this in the Research Question part of the video. Well done!
Glad it was helpful! I agree with you that working on a 'hot topic' is essential to see high citations. I referenced to this in my 'Research Question' part of this video. Thanks.
You are a legend
Thanks.
One of the knowledgable and helpful video that I found ever for my Mtech thesis. love from india ❤
Happy to hear that!
i am confused what method can be used for particulate composite simulation to find all mechanical properties, or can i use RVE method
Yes... you can use RVE method and use homogenisation to extract effective properties.
@@MichaelOkereke Sir, can mechanical tests be used to validate an RVE simulated model?
@@danielorueri6003 Of course, following homogenization, you extract properties that compare with macroscale mechanical tests data.
Sir, How to write review paper, i m confused pls help me. i am working on particulate composite ls help me in the simulation and experimentation
This should help you write a paper including review papers... ruclips.net/video/E1iDfcsh-m4/видео.html
Please Sir tell how to break porous metal material in abaqus
You would need to include a damage model yo your material model. I can suggest you consider this video: ruclips.net/video/gpSh2KLWnqk/видео.htmlsi=cNq4WBvj7EHVPlAL
Thank you 👍
You are welcome
Sir how to create failure in porous materials like you shown in the tensile test specimen video is it we have to put relative density like 0.5, 0.6 values in it by adding porous plasticity module?
Not sure about this... sorry cannot help.
If we did not create or model in abacus we don't get geometry option in sets. What to do instead in such case?
You can manually select those nodes/elements and put them into a set. You can also use other methods for extracting stress strain other than the homogenization approach here for example the experimental-equivalence approach (see my video on how to get stress-strain plots in abaqus by 3 approaches).
Great Work Sir, can you please do this for microstructure-based RVE modelling. I mean where I can upload my actual two-phase microstructure obtained using SEM.
This is possible. I do not have any video based on SEM-derived virtual domains. Direct-message me on my socials and we can explore what to do about this.
Hello Dr. Michael Okereke! I always appreciate your high-quality lectures. I have a question regarding the process of determining shear properties, as the stress values are not coming out correctly. I have set PBCs conditions and applied pure shear on the boundaries. Currently, the geometry information is as follows: Unit: [micrometer] N_number -> (x_coord, y_coord) N1 -> (0,0) N2 -> (300,0) N3 -> (300,300) N4 -> (0,300) The reaction forces at each node are as follows: Unit: [mN] N_number -> (RF1, RF2) N1 -> (-3400,-3130) N2 -> (0,3130) N3 -> (0,0) N4 -> (3400,0) Using this information to calculate the stress values results in a value of '0'. Could you please advise on what needs to be corrected? Thank you always.
Its difficult to say what is going on here. You may have to contact me directly via direct message on any of my socials.
Very interesting video Dr Okereke
Thanks
dear doctor!Great vedio~i have a question: abaqus Explicit computation Applying periodic boundary error? How to modify ***ERROR: Abaqus/Explicit has formed at least one very large implicit system of equations associated with enforcing constraints.abaqus explicitly computes an error when applying a periodic boundary? How to modify ***ERROR: Abaqus/Explicit has formed at least one very large implicit system of equations associated with enforcing constraints.
not sure about this error.
Thank you 😊
You're welcome 😊
hello sir, thank you for your clean explanation. but there is something i want to share with you. based on ABAQUS documentation, "Fracture Strain" means "Equivalent fracture strain at damage initiation". so there is a contraction between what you defined in the video and ABAQUS documentation. in another way, the strain you defined in the video, is more like "rupture strain" based on ABAQUS documentation. have I missed something ?
Thanks for the info. I believe the essence of the video is right, the specific way you or I interpret these boundary values might differ but you ahve to keep iterating your simulation until experimental data matches numerical data. This video is simply a guide for the beginner modeller in this area.
excuse me, Can I ask some question that is not relative with this video ? My model is hybrid composite between KFRP and CFRP under low velocity impact condition but I cannot get force value or plot force and time graph. Can you explain how to I solve this problem.
I think this is possible. YOu need to track a set of node/nodes from which you extract forces or displacements. You have to kinematically linked a reference point to a section of the material. I have a few videos on this channel on RVE modellign where I showed this kinamtically linked *EQUATION approach of using a reference point node to load and extract properties from a model.
Wonderful Explanation Sir, Thank you so much🙏
You are most welcome
Thank you for the video. So if we change the mesh size do we also need to change the displacement at failure parameter?
Yes, because the mesh is linked ot the characteristic length. You can play around with it and see if it makes any difference but theoretically, yes you need to.
Do you have any video on fatigue analysis of composite? If it is there please share...
Not yet, sorry!
A Lively video🙌 Btw I'm not really sure if it is the best time to ask but, While watching I noticed a few opportunities to improve the video, I've prepared a short video outlining some tips. Mind if I sent it over?
Thanks for the offer. You can Direct Message me on my socials, especially LinkedIn.
This is so comprehensive and easy to follow. Thank you
Thanks. Glad you liked it.
Thank you very much Dear Prof for this video , i want to know, how can i apply a displacement for only one direction (Normal to the surfaces) for example 1mm to the Part of an ellipsoid ? and how can i do it ? please . Thank you again.
I think you can use a direct attachment to a set of nodes on that part of the ellipse you want to apply. Alternatively, use the Expressions to impose your load. This video should help you understand how to impose loads with expressions. YOu simply need to find the corresponding expression of load/displacement for your elliptical surface.
@@MichaelOkereke Thank you very much for your answer, I am not sure that I understood your suggestion correctly, can you provide us if it is possible a small video that will clarify the steps to follow.
Dear Dr. I hope everything is going well with you, In one of your videos regarding the pure shear stress analysis you used the slope of the stress-strain graph and divided the value by 2 to get the shear modulus, Why in this video there is no dividing and only the slope is considered? Thank you for your time
It depends, if you do pure shear then you divide by two. If simple shear where you only have shear in one direction (then you can divide by two). I had a detailed theory about this in the videos where I described implementation of pure shear in 3D RVEs. There is a 2D shear one where i compared pure and simple shear. Please look at those videos as they would help you.
Dear Sir thank you for your video, Could you explain what is the value two when dividing the slope of stress, strain to the value 2? Thank you for your time.
Pure shear will have two strain values, hence averaging out the strains will give you the overall strain in the body. The 2 is merely an averaging effect between the two strains.
Thanks you for tutorial!
You are welcome!