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Hybrid model, UMAT

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  • Hybrid model, UMAT

    Hi,

    I have written a UMAT for hybrid model (Bergstrom et. al). In the UMAT, I used fourth elastic modulus tensor as jacobian. It seems to create convergence issues right at begining from the first increment. The primary stress equation is (sigma_ij=2mu*epsilon_ij+lamda*epsilon_kk*delta_ij ) and I used that expression to compute the jacobian.

    Has anyone written a UMAT for this model? All suggestions are welcome.

    Thanks
    Brunda

  • #2
    I have coded that model as an Abaqus UMAT. Using a linear elastic Jacobian should be perfectly fine as long as the strains are small.
    My guess is that you have some other bug :(

    -Jorgen
    Jorgen Bergstrom, Ph.D. PolymerFEM Administrator

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