Hello Everybody,

      I am trying to implement Neo-Hookean hyperplastic model using VUMAT subroutine in abaqus explicit. I am able to run the single element model successfully but when I checked my energy balance, I found that my strain energy is to be zero. And therefore ETOTAL is same as external work. It would be great if any one can help me to resolve this problem. 

Best regards,

Rohan.