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VUMAT subroutine showing wierd results

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  • VUMAT subroutine showing wierd results

    Dear Jurgen and friends,
    I have written a simple VUMAT code for a continuum damage model.
    The problem I am facing is really strange to me.
    The SDV which takes the damage value works fine as long as I keep it zero and dont update it.
    As soon as I accumulate damage (ddam = ddamone + damold) where damold is stateOld(k,5) and ddamone is the increment part, the SDV 5 disappears saying the primary variable is not available for any frame.
    I have given zero values as initial condition in input file.
    The code is attached.
    I would appreciate any help in this regard.
    It is impossible to work when I see no logic in the code result and it makes me panic.
    Kindly help

  • #2
    That is very strange. A SDV should not disappear.

    I'm not sure how that can happen.

    Jorgen Bergstrom, Ph.D. PolymerFEM Administrator