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  1. ttavio

    Error in a UMAT subroutine

    I am trying to implement a creep model for saline rocks through a UMAT subroutine. From other works, I understood that during the implementation the Jacobian DDSDDE is defined considering the elastic material. Done this, the increment of viscous deformation (delta_ev) is calculated and the...
  2. ttavio

    Implementation of a creep-damage model in ABAQUS using subroutines

    Thanks Fea Way and Marekcon. I read F. Ouyang's work and decided, at first, to implement Norton's law for plane deformation and axisymmetric problems. In this case, where there is no damage, would the Jacobian remain the same as the elastic material?
  3. ttavio

    Implementation of a creep-damage model in ABAQUS using subroutines

    Yes. Do you have an example of a UMAT subroutine with creep-damage model?
  4. ttavio

    Implementation of a creep-damage model in ABAQUS using subroutines

    Hello, I am trying to implement a subroutine in ABAQUS regarding a creep-damage model for salt rocks. Reading the manual, I saw that ABAQUS has a CREEP subroutine. In this subroutine, an creep deformation increment, DECRA(1), is defined and is multiplied by a vector n, i.e., the gradient of...
  5. ttavio

    Error stress results with subroutine USDFLD

    Hello. I am modeling an elastic cylinder with coupled damage, using an axisymmetric model and a USDFLD subroutine, which changes the modulus of elasticity, based on the value of the damage variable. In this model, internal and external pressure is imposed on the cylinder, where over time the...

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