Learning Forum

[Pulsar123]

Dear all,nI am using Workbench 17.0, and was wondering how I can make one of the bodies in explicit dynamics made of Kevlar woven fabric. I know about Material Designer, but I can't seem to find enough info online about how to make Kevlar specifically and then make a body in explicit dynamics such that it is made of Kevlar and behaves in the same way. Help would be greatly appreciated.nThank you.n

[ramgopisetti]

Hi Array , Kevlar fabric is an Material and dependent on type of weave and layers, inorder to analyse the fabric with Kevlar, there are two approaches
1) RVE type
you will model the weave type and layers explicitly and apply Kevlar material to all threads and subject it to boundary conditions and this method is computational costly and u need texgen to creat the fabric models
2) Homogeneous type
In this method you will model an shell and apply homogenous material mostly ortho type elasticity and simple to use and model, that said state your goals for further help
Cheers Ram

[Pulsar123]

Thank you Array. Do you mean using texgen is costly? Also, can I import the texgen file into Ansys and make the geometry I have in designmodeler made from the Kevlar yarn?

[peteroznewman]

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Pulsar123

Adding to the list ramgopisetti started.

3) Cargo-Net of Links and Membrane of Shells

Here is the link to the ABAQUS paper. https://www.bodietech.com/pdfs/Predicting_Structural_Performance_of_Woven_Fabrics_AUC2003.pdf

The model would be built in Ansys using a grid of LINK180 elements and SHELL181 elements with only membrane stiffness, keyopt(1)=1.

One variation would be to use a the quadratic CABLE280 element and a quadratic SHELL281 element with only membrane stiffness.

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[Pulsar123]

Thank you very much Array. Do you know if I can model it in ABAQUS and import it into ANSYS. Unfortunately, there don't seem to be video tutorials online for using these functions/elements in ANSYS.

[Pulsar123]

Never mind. I have found one. But it doesn't indicate how I can simulate the influence of Kevlar microstructure. I will give it a try. Thanks.

[peteroznewman]

Array
Please reply with a link to the video tutorial you found,

[ramgopisetti]

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Hi Pulsar123 , Texgen is an opensource tool, you can download it over here http://texgen.sourceforge.net/index.php/Main_Page and you can export it to Ansys via a neutral file (ges) from the tool. Based on the Images you posted by the peteroznewman , the Author in that paper used shells with the membrare formulation with orthotropic elasticity ( you can find the properties in many journal and thesis ) . That said, based on your comment in following, you need microstructure or most approptiatly , RVE which can be achived via algorithmic design or using texgen. You can also use Material design -> woven type-> and creat the fabric and then export the structure as neutral file and proceed with the simulatio( limitations may apply based on generated bodies and mesh sizes)

My recommendations:: check this papers, they wil help you in your simulations

https://journals.sagepub.com/doi/abs/10.1177/2041419618776332?journalCode=prsa

Cheers, Ram

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[Pulsar123]

Array
These are the video tutorials that I found on YouTube.
https://www.youtube.com/watch?v=FKh-jtN1lz8
https://www.youtube.com/watch?v=2cs2KEDeslc

[Pulsar123]

Array thank you for the links. I do not have Material Designer, unfortunately, as my version of Ansys is 17.1. I will try both your texgen and the shell method recommended by Array.

[David Mercier]

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Hi, I think Ansys Composite PrePost could help you a lot, here some links:

• https://www.ansys.com/training-center/course-catalog/structures/introduction-to-ansys-composite-preppost
• https://www.youtube.com/watch?v=f2Nik2-Qs0M

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[David Mercier]

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And in the case where you need some reference material data for the Kevlar, there is many results in Ansys Granta Selector for example:

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