Finite strain plasticity in principal space UMAT ABAQUS HELP
Finite strain plasticity in principal space UMAT ABAQUS HELP
(OP)
Hello all,
I am trying to write an UMAT for finite strain plasticity in principal space (Algorithms for static and dynamic multiplicative plasticity that preserve the classical return mapping schemes of the infinitesimal theory -1992-Simo).
I am having convergence issues in abaqus. I verified my consistent algorithmic tangent modulus but could not find any problem with it. I am also attaching the expression of the spatial tangent modulus. It is obtained by pull back operations on the material tangent stiffness modulus.
I am little confused about the tangent modulus that I have to provide for the DDSDDE in abaqus. Do I need to change/modify the spatial tangent modulus (attached) to get compatability with ABAQUS.
Any help is greatly appreciated.
-Ravi
I am trying to write an UMAT for finite strain plasticity in principal space (Algorithms for static and dynamic multiplicative plasticity that preserve the classical return mapping schemes of the infinitesimal theory -1992-Simo).
I am having convergence issues in abaqus. I verified my consistent algorithmic tangent modulus but could not find any problem with it. I am also attaching the expression of the spatial tangent modulus. It is obtained by pull back operations on the material tangent stiffness modulus.
I am little confused about the tangent modulus that I have to provide for the DDSDDE in abaqus. Do I need to change/modify the spatial tangent modulus (attached) to get compatability with ABAQUS.
Any help is greatly appreciated.
-Ravi





RE: Finite strain plasticity in principal space UMAT ABAQUS HELP
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