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Variable Elasticity (Young) Modulus

I need to simulate a sheet forming but I must consider the variation of Young modulus with plastic strain.

Has anybody tried this? How can I implement a function for this? I have never worked with UMAT / VUMAT.

Thank you. 

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I've tried this but not with a UMAT. I write a USDFLD / VUSDFLD and it works well.

There's a good example in Abaqus User Subroutines Reference Manual. For version 6.8, it's at  §1.1.43. You can modify this example by calling variable "PE" and then define field(1)=array(7) which is variable "PEEQ".

Thank you.

I will try. 

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