Dear, Dr. Jorgen

Im in trouble.

I have been trying to carry out simple calculation of pure shear deformation of liner [I]hypoelastic[/I] body in finite strain.

However, in my FE analysis, the body deform very strangely and I have never been able to find what is the problem because the subroutine is too simple.

I attach the input and user material subroutine file I wrote.

I have a plan to calculate pure shear deformation of polymer using elasto-viscoplastic constitutive equation based on molecuar chain network theory proposed by Dr. Mary C. Boyce. However, without solution of this simple problem, I wouldnt be able to step forward.

If you can answer to this problem, please tell me what is wrong in these files.

Sincerely yours,