UMAT does not work under tensile displacement for Microscale RVE analysis

Dear all,

I have a problem in my microscale model which is 2d-hexagonal with
fiber/polymer components.In UMAT, I have used Eindhoven glassy polymer(EGP)
behavior for polymer and Abaqus calculates fiber elastically itself. My code
works under compression displacement while it does not work in tensile
displacement( since it is 2d, both displacements are transverse). In
compression, it also does not work even for compression after intrinsic
softening behavior of polymer starts.I could not figure out the reasons,
indeed the problem in the code. 

If anybody faced with that kind of problem and if you shared with me, I
would be glad a lot.

Senem



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