Hybrid Composites: An ABAQUS RVE Modelling Tutorial

[@marketzone157]

Dear Sir..Thanks for your videos on RVE .. All your videos are really helpful..I appreciate your efforts to help others by sharing your knowledge...God bless you..

[@MichaelOkereke]

You are most welcome Ramesh. Thanks for your interest in the channel.

[@eng2164]

Thank you Dr Michael, its really valuable

[@MichaelOkereke]

Glad you think so! Thanks for your interest in the channel.

[@dileckma7552]

Thank you so much Dr Michael

[@MichaelOkereke]

You are very welcome

[@allanshadowrine5187]

Thanks for the video, I was wondering what hydride properties I would use to define an inclusion for modelling an RVE

[@MichaelOkereke]

Hello @Allan, I am not sure about the question. What kind of composite are you referring to? Is it a hydride composite as used in hydrogen storage? If so, I have never worked on such composite so unsure about the properties you'd need. Have you looked at journal publications in the research area? Are you interested in elastic, plastic or damage predictions? It all depends on what sort of modelling you are interested in but by all means, a relevant RVE designed for such composite will be a good start of point. Let me know more about the question!

[@allanshadowrine5187]

@@MichaelOkereke Hello Dr. Michael, Thank you so much for the reply. I am interested in elastic predictions of Zircalloy hydride. I have tried creating an RVE on Abaqus but I don't know how to generate randomly 100 inclusions using a script.

[@MichaelOkereke]

Hello @Allan, did you try using my MontCarlGen2D for creating random circular inclusions? Will this be diffrent from your kind of problem?

[@allanshadowrine5187]

@@MichaelOkereke Hello Doctor, I used a python code to create a 2D, then extruded my inclusions manually because my script couldn't model in 3D. Thank you so much

[@303sandhya4]

thank you so much sir for sharing this video ....it helps me a lot in gaining knowledge....

[@MichaelOkereke]

Glad to hear that

[@aslamsajad1112]

Thanks a lot sir. Can you please do a video on fibre and nanoparticles in matrix?

[@MichaelOkereke]

Thanks Aslam for your interest in the channel. What kind of material are you looking at? Do you have a journal article that I can reference? I will use it to consider making such a video.

[@BerkayVatansever]

Thanks for the video sir. Just have one question. Would greatly appreciate it if you could help out a little. I'm trying to model a hybrid composite out of metal and GFRP. My professor suggested we should use a cohesive behavior and damage under interaction properties. I'm having a hard time determining the parameters for that though. The geometry of the model is not straightforward so I can't use my experimental data to determine the parameters. The actual physical prototypes were manufactured with injection molding. We are trying to recreate tensile tests on Abaqus. Can this be done without the CZM? Like you did here.

[@MichaelOkereke]

I think you can use this method but I will suggest you also create a cohesize zone element around the fibres. Modelling it is not trivial you will have to get the properties. I do not have any video about the complete modelling of the system with a cohezive zone element. Here is a video where I did model the interface in a different way - you can explore this or stick with your supervisor's suggestion as that is always better: kzbin.info/www/bejne/hqHbhp2ej62onbM

[@sifrugardgilby327]

Thank you for this video, it is very helpful in designing hybrid materials in ABAQUS! I can see that you are using SI-units for material data, but for the dimensions of the fibers/matrix you use μm as unit in stead of m, why is this? 🙂

[@MichaelOkereke]

Hello, thanks for the comment. I am indeed using SI units. I made a video to justify and explain the approach here: kzbin.info/www/bejne/j5amc3ehn6qgerc Please check it out.

[@sibajidas3666]

Thank you very much for posting the video. It is quite beneficial. However instead of using three layers, how can we disperse these fibres throughout the cross-section?

[@MichaelOkereke]

Hello Sibahi, I am not sure which instance the case you describe will apply. Hybrids seen here will normally be laminates in which case the fibre bundles will be localised in layers. If you want hybrids where the particles are distributed randomly without layering, that will seem to me to be a particulate composite. If so I have this video for your reference kzbin.info/www/bejne/bGaVc3SjpZKpeJo

[@mimidan-bi9yp]

thanks sir. plc make one model basalt fiber concrete cub under mass diffusion

[@MichaelOkereke]

Hello @Mimida, I have not modelled mass diffusion before so unable to help you here. Good luck with the work.

[@sadiqamin6425]

Thank You, Sir. I have to do a simulation of a big assembly made of chopped fibers in Abaqus. I don't know how to assign chopped fibers properties to all the part instances. Can you please instruct me or make a video?

[@MichaelOkereke]

Hello @Sadiqu Amin, please see my earlier comment where I tried to answer this query. Is that what you were asking about?

[@Potentflowconsult]

Very interesting explanation! Explained in a way that non-mechanical engineers can I understand. I am trying to model ABAQUS RVE for sandwich structure with UD CFRP skins. I guess I can use the same strategy?

[@MichaelOkereke]

Hello @Jide Williams, thanks for your interest in the channel. With careful thought on what your RVE should look like, I believe you can apply the strategy to your CFRP-skin sandwich structure. Good luck in the research.

[@kikinblade12]

Very useful video, Dr! I have a question, is it possible to apply PBC in a thermo-mechanical model and how to do it?

[@MichaelOkereke]

Yes you can!kinblade12. I believe you can apply PBCs to temperature histories as well. Since you are looking at thermo-mechanical study, you can use the normal displacement histories as usual but them apply temperature as a dirichlet BC. There is a bit of playing around but it is possible.

[@kikinblade12]

@@MichaelOkereke thank you, Dr! Is there any documentation or video you could provide?

[@MichaelOkereke]

@@kikinblade12 None for now but I will see if I can make a video to help in future.

[@pranavgoyal2798]

Hi, are there any research papers that you can recommend in order to develop a better understanding of RVE and modelling hybrid composites or any sources that you obtained your data from?

[@MichaelOkereke]

Hello @Pranav Goya, thanks for your interest in the channel. I referenced some of the papers that I used in the video. Did you have a look at that? I will advise that you use Google Scholar to search for papers on RVE (or multiscale, or micromechanics) modelling of hybrid composites. This should point you to some publications. Having said that, there is not a lot of reading materials on the specific issue of RVE modelling of hybrid composites. I plan to do some short e-book series on RVE modelling of different materials (of which hybrid composites will be one of them). This can help my audience gain some insights from what I have learned. This is part of my 2022 plans. Is this something you will be interested in?

[@pranavgoyal2798]

@@MichaelOkereke Yes I did. Thank you for your help! Actually, I'm doing my final year project for my UG and I find your resources very helpful.

[@anisallahdinian5984]

thanks for your video.. if we need to define interaction between particle what should we do?

[@MichaelOkereke]

Hello Anis, the simple answe is that you have to specify the sort of interaction for the particles or fibers. This can be a contact mechanics specification to the model. This is how I will do it.

[@anisallahdinian5984]

@@MichaelOkereke yes i define interaction between them but i still have errors for that and my meshing .maybe i've defined wrong interaction. but i try to fix it .. thanks

[@MichaelOkereke]

Hello Anis, you can join my CM Videos insider group and you can via the email send me information about what problem you are solving and I can look into it to help you. Here is the link: cmvideos.ck.page/16a99bd0e3

[@anisallahdinian5984]

@@MichaelOkereke woow thankk a lot ...i will send you email in few days later an join your CM Videos too... thank you again

[@mazednpu3834]

Hello dear sir thank you very much for your videos. Sir is there any references where from you took the dimension of the fiber and properties. It will be so helpful for me sir,eagerly waiting for your response please sir

[@mazednpu3834]

Specially the diameters for different fiber

[@MichaelOkereke]

Hello @Mazed, I did not take it from any publication in particular. YOu can find these out from searching on the internet, for each fibre type. That is what I did.

[@mazednpu3834]

Thank you very much sir

[@303sandhya4]

sir ,could you please make a video ,,,if the fibers are randomly arranged in matrix.....no any specific direction....for example CNT's mixed in any metal ....

[@MichaelOkereke]

Hello 303 Sandhya, I am noting the request and will consider making a video about this in future.

[@303sandhya4]

@@MichaelOkereke waiting for your video sir😇😇😊😊

[@masfikunmahim4691]

how to find stiffness matrix of a structure (preferably in RVE modelling) in Abaqus?

[@MichaelOkereke]

Hello @Masfikun, I am not sure about doing this at RVE modelling scale. It can be done from the principle of Direct Stiffness Method. I have an extensive discussion of this in my textbook (see Chapter 3) where you can learn about this. Here is a link to the textbook: link.springer.com/book/10.1007/978-3-319-67125-3

[@joonabil]

Very interesting video but could you provide us with simple software to generate these random coordinates like Excel sheet. Thanks in advance

[@MichaelOkereke]

Hello John, thanks for your continued interest in the channel. I do not think there is a way of generating the randomness with an Excel sheet. It has to be done using some script that implements the Monte Carlo process. I am going to show some videos of this and so keep looking out for that.

[@qqiangg1]

Can you share the inp or CAE file here?

[@MichaelOkereke]

I will look into this request.

[@MichaelOkereke]

Hello @qqiangg, I have now added the CAE file as a downloadable resource in the Description Section of this video. YOu can extract the file here: tinyurl.com/8wskm99t. Good luck with your research.

[@rajeshkumars4121]

@@MichaelOkereke i have checked the link the file is not found. Sir, Can you share the script or CAE file here?

[@ashfakursalehinlemon]

Sir, if I use the formula N= [(4*Vf*L*W*H) / (pi*D^2*H)] to calculate the number of fibers, as you showed in this video (kzbin.info/www/bejne/i563qICHeaidfZY) the number of fibers for E Glass, Jute and Pineapple are 26, 46, 11 respectively. But in this video you've got 11, 19, 6 respectively for E Glass, Jute and Pineapple fibers. Which formula did you use here? Or, how can this calculation be mathematically valid if you used the same formula as the video I've mentioned earlier?

[@MichaelOkereke]

Hello, I think you might be getting it wrong. The Height, H for the hybrid composites is divided into three because of the three layers of the hybrid composite. So, instead of 240 microns, you have to calculate with 80 microns. Try that and see if it gives you the expected result.

[@aliakmal945]

hi can you send me the name of this paper please?

[@MichaelOkereke]

Hello @Ali, I gave the details of the paper within the video, if that is what your query is about. Let me know.

[@aliakmal945]

@@MichaelOkereke i didnt see the name of paper. can you just tell me the name of your paper.

[@aliakmal945]

hello Sir hope you will be fine, do have the videos of continuous fibers composites ?

[@MichaelOkereke]

Yes I have. Just search around the videos on the channel. In fact, this is a popular one for continuous UD fibre reinforced composite: kzbin.info/www/bejne/i563qICHeaidfZYsi=VmpmEO8QHoEijpvJ

[@aliakmal945]

@@MichaelOkereke Thank you so much Sir, is there any video about multi directions? like 0 and on 90 degrees.

[@MichaelOkereke]

I have a video on the channel on multilayer composite which can help. Here is the link to this video: kzbin.info/www/bejne/rWrLpXuqhtmtiZo

[@aliakmal945]

@@MichaelOkereke thank you so much you are so kind sir, i was just watchin this video. Sir i am trying to reach you through email, but i am not able to access your email in your about section. is there any other email do you have?

[@MichaelOkereke]

Its [e-mail]