Hello researchers,
Hope you are doing good. I am trying to see the Bullet Impact on helmet using LSDyna software. But I need to use Orthotropic Properties for Helmet geometry. So I tried with MAT_ORTHOTROPIC_VISCOELASTIC material card and getting error as image attached. How I can overcome this error? Which material card is suitable for this analysis as I need to see the deformation of the Helmet due to bullet Impact. Or Suggest Properties for Kevlar orthotropic material as I inserted all the necessary material props which I have for reference
Your suggestions are welcome. Thank you in advance.
This error, as the message indicates, is due to Poisson's ratio.
The Elastic Moduli (E11, E22, E33), and the shear moduli (G12, G23, G13) are related to each other through Poisson's ratio. So, the Poisson's values that you used violates this relationship.
Try defining only one Poisson's ratio instead of all three and see how it goes.
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