04 April 2017 2 6K Report

Hi all,

i'm coding a umat for hyper-viscoelastic behaviour and i wonder what formula use for the exact deformation gradient tensor F since dfgdr0 and dfgrd1 passed into the umat (according to Abaqus user subroutine reference manual 1.1.40) are a modified deformation gradients at the begining and the end of time increment respectively?

thanks in advance

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