Material Law 12

Gokul Ramarathnam_20422

Hello,

 

I'm in the early stages of orthotropic material modeling using Law12. This is new to me, so I am trying to verify that the material law works for a simple isotropic coupon. I gave identical properties for all directions and identical values for yield. I am not sure how to get the values of B 'material hardening parameter' and n 'material hardening exponent'. Could you offer me some assistance regarding this? Also, can Law12 capture the plasticity that we see in say a simple Aluminum stress strain curve? I believe that B and n drive the non linearity but I am not sure how to effect that into the curve.

 

Appreciate your help. 

 

Thank you!

Pranav Hari

Hi Gokul Ramarathnam

 

Law 12 describes a solid material using the Tsai-Wu formulation that is usually used to model composites. This material is assumed to be 3D orthotropic-elastic before the Tsai-Wu criterion is reached.

This is new to me, so I am trying to verify that the material law works for a simple isotropic coupon. I gave identical properties for all directions and identical values for yield. I am not sure how to get the values of B 'material hardening parameter' and n 'material hardening exponent'.

 

The strain hardening exponent (n)and strain hardening parameter(B) is a material's constant which is used in calculations for stress- strain behavior in strain hardening

If you are having an isotropic property then a suggested workaround is that you can run an analysis using Material law 2 with the value of iflag=1. Then you will get the values of 'B' and 'n' as the output of the results. This values can be used as the input for Material law 12

 

 

Thanks