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How VUMAT works for elements with more than one integration point?

Submitted by J_Fan on

Hi everyone

I am working on vumat subroutine for abaqus explicit. I know in the umat, the subroutine is called for each integration points. There are an argument that stand for integration number. So, I can output information (such as deformation gradient, stress ...) for each integration point.

However, in vumat, there's no arguments for integration points. I can only output element numbers. My question is, for an element with four integration points, how can I output information for each integration point? How the vumat is called for each integration point? Thank you!

Best,

Jiadi