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Nonlinear UEL and UMAT

UMAT in ABAQUS

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Nonlinear UEL and UMAT

Hi,

I've been learning how to implement material models using UMAT in ABAQUS and I have

some simple questions:

 

I've been trying to implement the viscoelastic models in the paper:

Formulation and implementation of three-dimensional viscoelasticity at small and finite strains

Kaliske, M.; Rothert, H., Computational Mechanics, Volume 19, Issue 3, pp. 228-239 (1997) .

 

1) The variable "STRAN" in UMAT corresponds to the strain at time $t = t_n$ or $t = t_(n+1)$,

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