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Recent content by idaapm

  1. idaapm

    Material orientation information is not available

    Hi, I got the following error message when I tried to visualize the deformed shape of my model. “Material orientation information is not available in the current frame for any elements in the current display group. Please make sure the primary variable is element-based and orientation had been...
  2. idaapm

    Fortran - variables management

    Thanks!
  3. idaapm

    Fortran - variables management

    Hi everyone, I've recently started to implement an UMAT in Fortran to use with Abaqus/standard. I'm fairly new in this topic and I'm struggling with some issues related with variables initialization. My questions are: - Do I have to declare and initialize all the variables I use within the...
  4. idaapm

    Abaqus - Error message (Average Force NaN)

    Hi, I'm using my own subroutine and input files. The job runs successfully, but when I try to see the results I have the following error message: The selected Primary Variable is not available in the current frame for any elements in the current display group. I've analysed the message file...
  5. idaapm

    how to quantify the energy to failure?

    Hi, I'm implementing a 3D progressive damage model for fibre-reinforced composites using Hashin's theory. This theory uses de equivalente displacements to compute the damage variables. My question is: how can I quantify the energy to failure per unit volume? I need that to compute the equivalent...
  6. idaapm

    input file

    Hi, I've developed an UMAT but I don't know if the errors that I'm having are related with the UMAT or with the input file. How can I run my input file using a standard subroutine from Abaqus? Thanks.
  7. idaapm

    UMAT - How to compute Jacobian matrix?

    I'm implementing a 3-dimensional progressive damage model for FRC using Fortran. The current version of the UMAT accounts for damage initiation (based on Hashin’s criteria) and damage evolution (based on equivalent displacements). The input data to the UMAT subroutine includes the strain state...
  8. idaapm

    Abaqus error message: primary variable not available

    With the use of the user-defined material subroutine (UMAT), I've implemented an implicit finite element code in ABAQUS/Standard aiming to describe the 3-dimensional mechanical behaviour of fibre-reinforced composite materials. At the moment I'm testing a simple model with one C3D8 element...
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