Umat subroutine for hyperviscoelastic behaviour

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Umat subroutine for hyperviscoelastic behaviour

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Hi everyone,
 I'm coding a umat for hyper-viscoelastic behaviour and i'm facing the following problem:
 I always get a false result because of the B-bar method in the umat. In fact my constitutive equations are functions of the deformation gradient F and the one passed into the umat (dfgdr1) is a modified deformation gradient .
 Can anyone help me
 Best regards
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