Hello all,
I am learning to write an ABAQUS VUMAT subroutine for Deshpande Evans (DE)/ Preston-Tonks-Wallace Material (PTW)constitutive model. I didn't write a subroutine before. I would appreciate any guidance toward the development of a subroutine. If anyone can share a VUMAT subroutine for DE/PTW model it would be of great help!
Thank you!
Best Regards,
Arif
Hello,
I'm really not familiar with your model but for visco elastoplastic models we usually do as following :
Parameters reading.
Elastic stress for the first check and the first time step. Then make the assumption of elastic stress increment, compute your yield function and if your result is not coherent you have to define a solver to satify all your model equations. I hope for you you have only one variable to control your whole model, either it will be tricky.
You can define your own algorithm (Newton Raphson or Line Step if I'm right) or you can also find one on the web for the problem resolution.
Don't forget to save your internal variables at the end of each step once you reached equations equilibrium.
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