UMAT -Data retrieval

[peegeebee]

Hello all,

I am working on a UMAT.I have the following problem.

I have a 3d element(C3D20R).I calculate the stresses
at the integration points.For example, lets say.it calculates the Stress
values S1 at the integration Point 1 ,S2 at point 2
and so on...

How to get the values of S1,S2,..at the last point 8 ?

Could anyone help me?

Regards,
Baskar

[Jorgen]

Hello Baskar,

One of the (few) good things about writing a UMAT is that you typically do not need to worry about which integration point you are considering. The UMAT subroutine is called with the increment in strain, the deformation gradient, and the time increment. All you need to do is to calculate the new stress state and update any eventual state variables.

Can you explain more about why you are trying to get the stress values at the different integration points?

- Jorgen