07 July 2017 3 7K Report

Dear All,

I want to using Abaqus UMAT to model stress relaxation due to the viscoelastic behavior of the material.

I created a 3D RVE contains fiber(elastic) and matrix(viscoelastic) and applied periodic boundary conditions. I already have Prony series of matrix, so I know the properties of matrix in each time step. I know abaqus has viscoelastic function for isotropic materials, but I need the umat work so that I can analyze viscoelastic behavior of anisotropic material later. The umat codes are attached. I don't know how to apply constant displacement loading on my model so that the STRAIN in umat is constant in the time loop.  Any comments and suggestions are highly appreciated.

Thanks

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