14 February 2016 1 3K Report

Hello everybody,

      My task is to write a UMAT for nonlinear viscoelastic material based on the attached paper. For now, I have written the UMAT (1D formulation) and I am able to generate the output. My problems are

  • Validity of the code I have attached the stress vs time graph for a relaxation test on 1D Truss element. The behaviour looks normal (correct me if you have to) to me.
  • If i change the input parameters, say I play with the initial time increment of Steps or change the displacement from 5 units to 10 units, the job keeps running and does not complete. I have to manually delete .lck file from the folder and again run the job. I am not able to understand what is going wrong. Would be really helpful if somebody could throw some light on it.

    • Thanks in advance for your time

    Shree

    P.S I have attached the input file and the UMAT for your reference

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