Dear Dr.Michael, Thanks a lot for sharing these valuable tutorials. Can you please do a video on the modelling and analysis of a composite with random orientation of fibers. For ex: Fiber reinforced concrete. Thank you and good luck.
Hello @Just Cz, thanks for your interest in the channel. That is a good suggestion. I will consider it for a future video and see how this can be done so that most users/viewers can pick up on this. The challenge lie in random creation of the inclusions using the Monte Carlo Methods. You will need to randomize the location and orientation of the fibres. It is a double-loop randomness. Then, after that, you will also have to assign material orientations to the fibres. In the mean time, check out this excellent video by *Engineering Software* channel, as it will guide you in the process: ruclips.net/video/Tm0MwIs2qCY/видео.html
Dear Dr.Michael sir, Thanks for shearing these valuable tutorials, can you please do a video on the modeling and analysis of Repeted drop weight test as per ACI 544 code.
D.r. Michael, I'm wondering how you simulate the unidirectional composites with curved fibers RVE in Abaqus. The way you plot the stress-strain graph is excellent. I also attempted to plot the stress-strain graph after extracting the reaction force and displacement data from abqus to excel and pasting it into excel. However, it is not as good as your plot. So, could you please send me your Excel template, or could you tell me the procedure how to create the temple in excel?
Hello @Endalkachew, thanks for the comment. The excel file is in the description section of the video under the links provided as downloadables. Have you checked that? Try that and let me know if you had any problems.
@@MichaelOkereke No, I did not checked. Let me check it and if I find any problems, I will notify you. Thank you very much for taking the time to address all of our questions without becoming bored.
Dear Dr.Michael, thanks a lot for sharing these valuable tutorials. The fiber bundle is a transversely isotropic material, and the video does not seem to give direction to the fiber bundle, could you please tell me why?
Hello @Xiaoyu Wang, thanks for the observation and you are absolutely right. Especially as I have chosen to model the fibres as carbon fibre which has transverse isotropy properties. I did not include this in this video for now because I was not going to model the fibre in this video. In another video, I will modell the problem in which case I will specify a fibre orientation for this. The essence in this video of creating a material was simply to help me do section assignment of the constituents and so the materials are simply placeholder materials for this stage of the model development. I hope this makes sense and you understand.
@@MichaelOkereke Thanks a lot! Looking forward to the next video about how to specify the orientation, especially for fibers that are curved or non-straight.
Hello @Walid, thanks for the query. I missed the steps that focus on creating shear in this particular video. If you look around RVE modelling videos in this channel, you will see how apply shear. I also made a dedicated video on shear modelling (pure) for 3D RVEs which you can review here: ruclips.net/video/0EvtcFygIBI/видео.html
Hello @Shravan Bhadoria, thanks for your interest in the channel and your comments. Actually, the Shear Modulus on the YZ-plane is different from the Young's Modulus in the Z-direction. The modulus in the Z-direction is obtained from a uniaxial test while the shear modulus is derived from a shear test. The former characterizes size change while the modulus is a measure of shape change. In shear you have angular change of the structure and so the modulus measures this angular change i.e. shear modulus on YZ plane is a measure of how stiff/easy it is for the structure to be deformed in the YZ-plane. The Young's modulus on the Y-axis is a measure of how easy/stiff the structure is in terms of resisting size change along the Z-axis. I hope these explanations make sense to you.
Hello Zaho, I was just reading about this type of structure and it's fascinating. I will add it to my list of videos to do in future. Thanks for suggesting it.
Thank you Dr. Micheal for the video. I would like to showcase my composite model similar to how you did at 9:55 however I am having trouble finding the tools within Abaqus to make the fibers opaque color and the matrix partly transparent. What options should I use to get this model visualization? Thank you.
Hello Esam, since I am using RVE modelling with constituents of the composite modelled separately, I didn't need to use the homogenized model properties of say classical laminate theory. What you say becomes valid if you are modelling a homogeneous composite where you cannot distinguish the constituents properties.
Hello @Diane Farah, thanks for your interest in the channel. I can of course try modelling such lenses. It will help if you can share with me a reference publication you have of similar modelling so I can work off that. I need to understand the sort of problem with intraocular lenses that you are investigating i.e is it only mechanical deformations or do you want to model the CFD effects on the lenses?
I think this can be done similar to what I did here. Just sketch the fibre in the centre of the 2D view of the RVE and extrude it in along the length of the RVE. If you want the fibre to be broken, you will have to then extrude it to somewhere in middle of the RVE, then stop and repeat the process but allowing a break between the continuous fibre segments. I am not sure if this makes sense to you. You can email me and I can understand the problem more and then try and explain more about this to you.
Hello @Aditya, I actually have an online course about modelling of 2D woven composite. Not yet for 3D composites. Please subscribe to my CM Videos Insider Group (see description section of this video) and via that you can contact me directly.
Hi @Funny Moments, here are three immediate things you can try: 1. Change/reduce the seed size to make it into a finer meshed model. 2. Change element type to triangles (2d system) or tetrahedron (3d system). Most models will mesh with these types of elements. 3. Partition the model at places where you find intersections in the model. Use the partition tool. If all these do not work, try checking those places in the model where intersections exist and spread the model about. The translation tool can be used to move fibres around so that the system will not have intersections. Let me know how you get on.
Hello @Esirael Jhon, thanks for the request. I understand steel fibre reinforced concrete beam but what about the geopolymer aspect? Please can you provide more guidance on what geopolymer you have in mind? Maybe, a link to a journal paper on this issue will help. Thank you.
Okay @Esirael, now I sort of understand the question. I might not be able to do this model now but will consider it in future. I am working on other projects at the moment. Thanks for taking time to explain what you need.
Hello @Maryam Mohammadi, thanks for your interest in the channel. I am not working on XFEM videos for now. In future, I might do so keep watching the channel for when such become available. However, there are videos though on RUclips about XFEM - maybe not for RVE models but you can use their ideas with my approach to create something. Have you considered looking at those videos? Good luck with your research.
i couldnt explain myself in the live stream sir, what i want to know, as you said this is a little sample. as an engineer i am analysing large scale models that is not made of composite right now. but i want do improve my skills. for a simple material we apply test datas to determine new material properties in the software. let say i am gona analysis a F1 race car body which is made of composite material in this video. there are two ways to do it; 1- modeling whole car body like this using tiny fibers, which is really hard and time consuming and need to super computers to solve. 2-? this is my question sir; is there any other aproach to solve it without consuming too much source.(time money power) what i guess is doing a small scale analysis then extract the results of material properties as a new material. then could we use this stress strain result to our new model without consist little fibers. any idea how accurate will be the result? sory for my bad english sir, hope i could express myself, and sorry for my ignorence in the advanced FEA field.
Hello @Hamza Djeloud, I apologize for missing out on the downloadable resources. I have now added them. Please go back to the video description and you should be able to download the script and other resources.
@@MichaelOkereke Thank you sir for your interest because you can download a file I wanted to make sure to find a text in MATLAB that gives the random values for the fiber center.
Hi Sir, I just subscribed to your channel. I find your videos very helpful, such important content!! I have a special request. I'm still a newbie in Abaqus, but I'm working on soft actuators that are based on liquid metals. I have designed a rectangular prism elastomer made of Ecoflex with a rectangular hole, which will be filled with liquid metal Gallium. I want to simulate the stretching and contracting of this elastomer when a load is hanged or applied to the other end, and the liquid metal is heated to change phase from liquid to solid or vice versa.
Thank you, sir, Dr. Michael Okereke, you have great content.
Thanks Hamza for your kind comments. I hope you enjoy the video
Dr. Okereke, thanks a lot for this video, really helpful for my researches.
thank you so much for this video, i had struggle in curved fibers modeling it helped me so much
Glad it helped.
The content you make has been very helpful Sir. Thank you so much.
Glad you found them helpful @Arpit Panwar
Dear Dr.Michael, Thanks a lot for sharing these valuable tutorials. Can you please do a video on the modelling and analysis of a composite with random orientation of fibers. For ex: Fiber reinforced concrete. Thank you and good luck.
Hello @Just Cz, thanks for your interest in the channel. That is a good suggestion. I will consider it for a future video and see how this can be done so that most users/viewers can pick up on this. The challenge lie in random creation of the inclusions using the Monte Carlo Methods. You will need to randomize the location and orientation of the fibres. It is a double-loop randomness. Then, after that, you will also have to assign material orientations to the fibres. In the mean time, check out this excellent video by *Engineering Software* channel, as it will guide you in the process: ruclips.net/video/Tm0MwIs2qCY/видео.html
@@MichaelOkereke Thank you so much for your directions Dr. Michael. I'll check this video. Eagerly waiting for your tutorial video on this. Thank you
Dear M.Okereke
can you send me the script file using for generating the inclusion
THANK YOU SO MUCH DOCTOR
Thanks Esam.
Dear Dr.Michael sir, Thanks for shearing these valuable tutorials, can you please do a video on the modeling and analysis of Repeted drop weight test as per ACI 544 code.
Hello @Kesavamoorthi, thanks for your interest in the channel. I am not able to make this video so sorry. I wish you the best with your work.
D.r. Michael, I'm wondering how you simulate the unidirectional composites with curved fibers RVE in Abaqus. The way you plot the stress-strain graph is excellent. I also attempted to plot the stress-strain graph after extracting the reaction force and displacement data from abqus to excel and pasting it into excel. However, it is not as good as your plot. So, could you please send me your Excel template, or could you tell me the procedure how to create the temple in excel?
Hello @Endalkachew, thanks for the comment. The excel file is in the description section of the video under the links provided as downloadables. Have you checked that? Try that and let me know if you had any problems.
@@MichaelOkereke No, I did not checked. Let me check it and if I find any problems, I will notify you. Thank you very much for taking the time to address all of our questions without becoming bored.
Dear Dr.Michael, thanks a lot for sharing these valuable tutorials. The fiber bundle is a transversely isotropic material, and the video does not seem to give direction to the fiber bundle, could you please tell me why?
Hello @Xiaoyu Wang, thanks for the observation and you are absolutely right. Especially as I have chosen to model the fibres as carbon fibre which has transverse isotropy properties. I did not include this in this video for now because I was not going to model the fibre in this video. In another video, I will modell the problem in which case I will specify a fibre orientation for this. The essence in this video of creating a material was simply to help me do section assignment of the constituents and so the materials are simply placeholder materials for this stage of the model development. I hope this makes sense and you understand.
@@MichaelOkereke Thanks a lot! Looking forward to the next video about how to specify the orientation, especially for fibers that are curved or non-straight.
Hi teacher, i want to ask you for how did you do the : xy shear , xy shear case ...... ??
Hello @Walid, thanks for the query. I missed the steps that focus on creating shear in this particular video. If you look around RVE modelling videos in this channel, you will see how apply shear. I also made a dedicated video on shear modelling (pure) for 3D RVEs which you can review here: ruclips.net/video/0EvtcFygIBI/видео.html
Hello Dr. Michael. One doubt here. Isnt the shear modulus YZ equal to Young's modulus in the Z direction? (Time: after 34:05)
Hello @Shravan Bhadoria, thanks for your interest in the channel and your comments. Actually, the Shear Modulus on the YZ-plane is different from the Young's Modulus in the Z-direction. The modulus in the Z-direction is obtained from a uniaxial test while the shear modulus is derived from a shear test. The former characterizes size change while the modulus is a measure of shape change. In shear you have angular change of the structure and so the modulus measures this angular change i.e. shear modulus on YZ plane is a measure of how stiff/easy it is for the structure to be deformed in the YZ-plane. The Young's modulus on the Y-axis is a measure of how easy/stiff the structure is in terms of resisting size change along the Z-axis. I hope these explanations make sense to you.
Hi sir. can you do video on Directionally distributed steel fibre reinforced concrete
Will try
Sir, How to change fiber orientation angle in the composite. such as fiber would be orientated at 15, 45, and 60 degree angles.
Hello, you may find this video helpful: ruclips.net/video/w9htHtQtzS8/видео.html. I showed how to create fibre bundles of different angles.
Thank you Mr can you make video how to madel a bouligand structure
Hello Zaho, I was just reading about this type of structure and it's fascinating. I will add it to my list of videos to do in future. Thanks for suggesting it.
@@MichaelOkereke tkanks Mr Michael for ur effort
Thank you Dr. Micheal for the video. I would like to showcase my composite model similar to how you did at 9:55 however I am having trouble finding the tools within Abaqus to make the fibers opaque color and the matrix partly transparent. What options should I use to get this model visualization? Thank you.
Show transparency so we see inside an RVE #abaqustutorial
I have one question about material put in because in the material library the is special for fiber composite material you did not use it
Hello Esam, since I am using RVE modelling with constituents of the composite modelled separately, I didn't need to use the homogenized model properties of say classical laminate theory. What you say becomes valid if you are modelling a homogeneous composite where you cannot distinguish the constituents properties.
Hi Dr., are you able to share how to model an intraocular lens (folded as a u-shape) on Abaqus? Thank you
Hello @Diane Farah, thanks for your interest in the channel. I can of course try modelling such lenses. It will help if you can share with me a reference publication you have of similar modelling so I can work off that. I need to understand the sort of problem with intraocular lenses that you are investigating i.e is it only mechanical deformations or do you want to model the CFD effects on the lenses?
Sir, I wanted to place a broken fibre in centre of RVE. Could u please help me with the steps needed to be followed?
I think this can be done similar to what I did here. Just sketch the fibre in the centre of the 2D view of the RVE and extrude it in along the length of the RVE. If you want the fibre to be broken, you will have to then extrude it to somewhere in middle of the RVE, then stop and repeat the process but allowing a break between the continuous fibre segments. I am not sure if this makes sense to you. You can email me and I can understand the problem more and then try and explain more about this to you.
@@MichaelOkereke Thank you Sir for your timely reply
@Dr Okereke can you please show us how to model 2D woven and 3D woven composites?
Thanks Adi
Hello @Aditya, I actually have an online course about modelling of 2D woven composite. Not yet for 3D composites. Please subscribe to my CM Videos Insider Group (see description section of this video) and via that you can contact me directly.
Thank you Dr. Michael. But, when I did the way for higher volume fraction, the RVE gets orange and it is not meshable.
Hi @Funny Moments, here are three immediate things you can try:
1. Change/reduce the seed size to make it into a finer meshed model.
2. Change element type to triangles (2d system) or tetrahedron (3d system). Most models will mesh with these types of elements.
3. Partition the model at places where you find intersections in the model. Use the partition tool.
If all these do not work, try checking those places in the model where intersections exist and spread the model about. The translation tool can be used to move fibres around so that the system will not have intersections. Let me know how you get on.
@@MichaelOkereke Thanks for your kind response. I will do your points.
Thank you D.r...Can you Model steel fibre reinforced geopolymer concrete beam on Abaqus please?
Hello @Esirael Jhon, thanks for the request. I understand steel fibre reinforced concrete beam but what about the geopolymer aspect? Please can you provide more guidance on what geopolymer you have in mind? Maybe, a link to a journal paper on this issue will help. Thank you.
Dear D.r I mean to say that assembling steel fibres with concrete beam L:1m h:300mm,width b:200mm....geopolymer mean concrete... sorry Doc
Please D.r help me how to model multi hooked end steel fibre into 1m length matrix
Okay @Esirael, now I sort of understand the question. I might not be able to do this model now but will consider it in future. I am working on other projects at the moment. Thanks for taking time to explain what you need.
@@MichaelOkereke please D.r I need your help to simulate it....urgently i am Msc researcher and if you do this until february 2023 i am waiting on it
Hi Dr. Michael
Please tech how to Place and grow crack s by xfem method in a rve containing particle with random distrubtion
Thankful
Hello @Maryam Mohammadi, thanks for your interest in the channel. I am not working on XFEM videos for now. In future, I might do so keep watching the channel for when such become available. However, there are videos though on RUclips about XFEM - maybe not for RVE models but you can use their ideas with my approach to create something. Have you considered looking at those videos? Good luck with your research.
@@MichaelOkereke
Yes i watched
Thank you doctor
i couldnt explain myself in the live stream sir, what i want to know, as you said this is a little sample. as an engineer i am analysing large scale models that is not made of composite right now. but i want do improve my skills. for a simple material we apply test datas to determine new material properties in the software.
let say i am gona analysis a F1 race car body which is made of composite material in this video.
there are two ways to do it;
1- modeling whole car body like this using tiny fibers, which is really hard and time consuming and need to super computers to solve.
2-?
this is my question sir; is there any other aproach to solve it without consuming too much source.(time money power)
what i guess is doing a small scale analysis then extract the results of material properties as a new material. then could we use this stress strain result to our new model without consist little fibers. any idea how accurate will be the result?
sory for my bad english sir, hope i could express myself, and sorry for my ignorence in the advanced FEA field.
Hello, thanks for your extended explanation. Option 2, as you describe, will be an improvement on option 1. This is the right way.
@@MichaelOkereke thanks for your return sir.
Dear M.Okereke
can you send me the script file using for generating the inclusion.
Hello @Hamza Djeloud, I apologize for missing out on the downloadable resources. I have now added them. Please go back to the video description and you should be able to download the script and other resources.
@@MichaelOkereke Thank you sir for your interest because you can download a file I wanted to make sure to find a text in MATLAB that gives the random values for the fiber center.
My next video will be about this very issue so Hamza please look for it when it's released. I believe you will find it helpful.
@@MichaelOkereke I hope so, sir
Hi Sir, I just subscribed to your channel. I find your videos very helpful, such important content!! I have a special request. I'm still a newbie in Abaqus, but I'm working on soft actuators that are based on liquid metals. I have designed a rectangular prism elastomer made of Ecoflex with a rectangular hole, which will be filled with liquid metal Gallium. I want to simulate the stretching and contracting of this elastomer when a load is hanged or applied to the other end, and the liquid metal is heated to change phase from liquid to solid or vice versa.