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  1. jojo998

    UMAT - definition of DDSDDE

    Thank you very much for you answer. However, I cannot believe that I am the only one facing this problem (I have not found an answer in forums), continuum mechanics is described via several strain measures, Green-Lagrange strains, Euler-Almansi strains, Rate of deformation tensor, let's even...
  2. jojo998

    UMAT - definition of DDSDDE

    In a UMAT calculation I have to return the STRESS and the tangent DDSDDE, I am not sure about the correct definition of the tangent. (1) The STRESS is the Cauchy stress. (2) The Green-Lagrange strain E is calculated via the deformation gradient F=DFGRD1 as E = 1.0/2.0 * ( transpose(F)*F - 1)...
  3. jojo998

    access to data in iterations

    Hi, I am doing a simple plasticity simulation on large deformations using UMAT. The simulation is not converging even for very small time steps. With URDFIL it is possible to access data for each increment (equilibrium). Is it possible to access results (displacements for instance) for each...

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