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Noted. Thanks. I am not able to make this video.

Noted... 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.

I do not have much experience to be able to offer any help.

It's in the formula section of the Excel file.

You run the simulations for different strain rates typically different velocities and then follow same steps as in this video for every simulation.

Thanks very much.

I don't understand. Do you mean a pdf of my book? If so, I don't have it. Thanks.

@@MichaelOkereke ok sir

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"

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

You are welcome.

You are welcome.

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

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 :)

Thanks and welcome

You are most welcome, as well, sir. Daalu.

Thanks for this. Glad it helped.

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!!!!!

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).

Noted. Thanks for the suggestion

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

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/

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.

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.

Thanks.

Happy to hear that!

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.

This should help you write a paper including review papers... ruclips.net/video/E1iDfcsh-m4/видео.html

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

You are welcome

Not sure about this... sorry cannot help.

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).

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.

Its difficult to say what is going on here. You may have to contact me directly via direct message on any of my socials.

Thanks

not sure about this error.

You're welcome 😊

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.

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.

You are most welcome

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.

Not yet, sorry!

Thanks for the offer. You can Direct Message me on my socials, especially LinkedIn.

Thanks. Glad you liked it.

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.

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.

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.

You are welcome!