RVE Modelling of Short Fibre Composites in ABAQUS

[@user-df9zx2fg6l]

Dear Dr.Michael, thanks for this tutorial about random short fiber. I need to create a fiber composite consisting of multiple cylindrical centers around which short fibers are arranged in a rotating pattern. I don't know how to create this model. If you share your suggestions with me, I would be very happy. I thank you in advance.

[@MichaelOkereke]

Hello, thanks for your query. I am not sure I understand what you are trying to do here. What I think you mean is that you want to create a micromechanical model of a short fibre composite but with the fibres distributed around a circular shaped RVE? Is this correct? What is the reason for this sort of RVE? What sort of loading are you looking to apply on such a circular shaped RVE? Is this a 3D or 2D problem, and if 3D, then I assume the RVE should be cylindrical. YOu did reference that the short fibres are small cylinders so I am thinking you are working on 3D domain. Please let me have some more information and then I will be able to provide more answers. Alternatively, just send me a message on my linked in here: www.linkedin.com/in/miokereke

[@anashijazi6953]

Dear Dr. Michael, Thanks so much for these videos. They are so helpful to start composites simulations. I really appreciate your efforts and time. Keep going sir.

[@MichaelOkereke]

You're very welcome Anas. Glad you found them helpful and in deed, I will keep going.

[@liverpoolkoplee57]

So kind sir! These videos are very helpful to me! Thanks very much!

[@MichaelOkereke]

Glad to hear that, thank you too!

[@zicofran]

thank you very much sir. these videos have helped me a lot with my thesis. very thankful.

[@MichaelOkereke]

Glad to hear that Francisco and good luck with your research. If you have ideas of videos you will want me to make, I am happy to hear them. Most of the videos on the channel are a response to user requests and if I can make the videos, I will.

[@peekcf844]

Dear Dr.Michael, thanks for this wonderful tutorial about random short fiber/aligned fiber, You mentioned in the video you provided the link for downloading "montcalgen2d" software but I couldn't find it in the description box, could you please share it with us. Thank you so much keep the good work. Appreciated a lot!

[@MichaelOkereke]

Hello @PEEK CF, thanks for your interest in the channel and the query. Yes, I did indicate that there will be a downloadable link to MontCarlGen2D. This is not yet ready. I am working my way to releasing the code for public use. Please keep bearing with me and I am working on it. Please keep coming back.

[@303sandhya4]

Thank you so... Much... Sir.... This is very useful to me❤❤❤

[@MichaelOkereke]

You are most welcome Sandhya and thanks for your interest in the channel.

[@ashfakursalehinlemon]

Sir, how can I know 58% Epoxy Matrix corresponds to E= 4.5 & V= 0.4 And 20% E glass fibre corresponds to E= 73 & v= 0.20?

[@MichaelOkereke]

I think for this problem you ahve to determine first the composite properties based on the given volume fraction. This is the only way you can prove what you are suggesting. I am not sure if this is the answer you are looking for as it is not clear to me what the question is.

[@anniewu4920]

Thanks for your helpful video, Really mean a great, could you give some hints about how to define cohesive behavior between the different parts?

[@MichaelOkereke]

Hello @Annie Wu, thanks for your kind comments and am glad you found the videos helpful. On cohesive zone issues, I am really working on this as there is a lot of comments/requests for such a video. I want to be sure I make a good video that will be helpful to my viewers. So, do keep coming back to the channel and see when this is done. I am going to prioritize making such a video as there is an overwhelming request for this.

[@Jade-jv6eq]

@@MichaelOkereke it will be helpful if you consider cohohesive zone covering the 3D random distributed short fiber( injected plastic product). can i have you email to send you a peper for reference?

[@mimidan-bi9yp]

plc Dr. Michael i need full tutorial video of importing the basalt fiber bar in abaqus

[@MichaelOkereke]

Hello @mimida@27 n 16, thanks for the comment. I do not have such a video and if you provide me with some reference material that describe this problem (a link to a reference paper will do), then I can review it and see if I am able to make such a video. I need to better understand the problem.

[@victorzhang8869]

when the montcarGen2D software will be available to us? cannot wait longer for that, lolol

[@MichaelOkereke]

Hello Victor, I apologise for the delay. I have been lately improving the usability of the code so that users can use it with minimal effort and where errors occur, the error-catching algorithms in the code will suggest to users what the error is and how to correct it. I believe this is essential for any software so that you will have a good experience with the code. I am also working on including some heuristics to the classic Monte Carlo process so that MontCarlGen2D can generate a higher volume fractions of RVE which is not always easy. If you know about the Monte Carlo process, it suffers from a jamming limit and this is typically at a volume fraction of about 40%-50%. Beyond this, the code will take too long to run. A heuristic implementation is normally included in the classic Monte Carlo process. This allows for stirring or shaking of the original inclusions in the box/RVE so that they 'settle' making more space for further inclusions to be added to the box. I am incorporating this 'stirring algorithm' into MontCarloGen2D hence the delay. I am also recording two videos to go with the Monte Carlo methods, the first being a discussion of the theory of the Monte Carlo Methods and the second showing how MontCarlGen2D works. Thanks for your continued patience and in the next couple of weeks, you will have the code.

[@sadiqamin6425]

I have an assembly made of chopped fibre and it has no proper orientation, and want to simulate it using Abaqus? Can you please direct me that how can I define a chopped fibre in Abaqus?

[@MichaelOkereke]

Hello @Sadiq Amin, thanks for your interest in the channel. I think what you are asking is how to specify properties to a fibre constituent in a chopped-strand short fibre composites. I will also assume that when you created the models, you had to design the fibre and the matrix independently, and within ABAQUS used the assembly module to combine them to form the short fibre composites. If these assumptions are true, then I will suggest you use the 'REMOVE SELECTED' button (on the menu bar) to select the Matrix (in the ASSEMBLY module) and this will remove the matrix leaving behind the fibres. With this, you can assign properties to the fibres by selecting all of them at once and using SECTION ASSIGNMENT to assign properties to the fibres. I hope this helps.

[@subratkumarmaharana213]

Sir..is it possible to introduce the orientation tensor in the script...so that we can get the results for different orientations..

[@MichaelOkereke]

Hello Subrat, you make a really good comment about the orientation tensor. It is very possible to do that but this has to also follow the Monte Carlo method of randomness. I always want the code to be independent of human interference so that you do not have to go and choose rotation tensors 'manually' and apply those onto the fibres. This is a half-way house, what I propose is an automatic way of choosing and implementing the rotation tensor. So for randomness of orientation to be included in the current implementation, the code should allow for a fibre orientation between 0 and 360 degrees and the chosen angle should be randomly determined. So, if you think about it, you will be looking at randomness in location and orientation. This will certainly slow the code down but it is possible to do. In future, I plan to incorporate the rotation-based Monte Carlo algorithm within MontCarlGen2D. Thanks for the suggestion though.

[@rashmigopalan4686]

Dear Dr. Michael. How to define the stacking sequence, material property of a combined mat consisting both woven roven mat and a CSM in alternative layers. I tried to do define the delamination of such mat such cohesive zone modelling. But I'm stuck with geometrical modelling of this combined mat. Can you please make a video of this. Or how to go about this modelling in abaqus without using any user-subroutines.

[@rashmigopalan4686]

Thanks in advance. Your video's are so useful.

[@MichaelOkereke]

Thanks Rashmi, this is not easy with mixing laminates without woven composites. I will need to consider it for the future. Thanks.

[@MH-be8lz]

Hello , how can i have script?

[@MichaelOkereke]

The links to downloadable are in the description section of this videos.

[@camiliiascreen2023]

Thank you sir, but I have a question, please how you can to select the start point of the fibers, are they selected randomly in the software?

[@MichaelOkereke]

Yes @Kamilia Leksir, the start point of the fibres is randomly generated. Based on that start point, we now create the required rectangle for the fibre. Someone can make the randomization to be based on the centre of the fibre but I chose to do it differently here. So, basically, the monte carlo methods generate random x and y coordinate positions to represent the start point of the rectangle i.e. the bottom left hand corner of the rectangle.

[@camiliiascreen2023]

@MichaelOkereke thank you so much Docteur, hope you a good job

[@camiliiascreen2023]

@@MichaelOkereke Dear doctor, can I get your email or any contact , please , i would like for your help

[@MichaelOkereke]

There is an email on the About page of my channel which you can contact me with.

[@camiliiascreen2023]

@@MichaelOkereke ok thank you 👍

[@narendrakumarjharesearchsc5159]

Hello sir can you make video on isotropic and concentric 3d printed composite tensile and 3point bending test

[@MichaelOkereke]

Hello Narendra, thanks for your interest in the channel. I have actually not modelled a 3D printed composite but following your comment, I looked at some papers on it and it does sound interesting. It is very much like a laminated composite, and one can quite easy do a microscale simulation of it. I will review your query with interest and maybe sometime in future make a video of 3D printed composites. Good luck with your research. If you have a research paper that you can suggest, that will be a good start off point for me to consider making a video that matches your interest.

[@narendrakumarjharesearchsc5159]

@@MichaelOkereke okay sir give me your mail id

[@MichaelOkereke]

Hello @@narendrakumarjharesearchsc5159 - here is a link to join my CM Videos Insider group, where I get to engage more closely with members in the group. You will also be able to email me directly from the welcome email. cmvideos.ck.page/16a99bd0e3

[@sameerkumar2833]

how to apply this unit model in any complex structure, please share a video

[@MichaelOkereke]

Of course this is possible depending on the details you have in mind.

[@sameerkumar2833]

@@MichaelOkereke can you share your email id? my question is how to apply 3d woven fabric in aerospace part.