I want to use both predefined fields and the UMAT user subroutine code in Abaqus 2020. In the initial step, I imported stress from an odb file using a predefined field and performed the analysis along with the UMAT code. I specified SDVn (State Dependent Variables) through field output requests. However, as the time step progresses, the values of each SDVn become the same in all elements.
For example:
- At time increment 1, SDV1 has a value of 10.0 in all elements, and SDV2 has a value of 50.0 in all elements.
- At time increment 2, SDV2 becomes 12.0 in all elements, and SDV2 becomes 47.0 in all elements.
When I use only the UMAT code without predefined fields, the SDVns show an appropriate distribution in each element. Similarly, when applying only predefined fields without the UMAT code, the analysis proceeds without any issues.
I need assistance in identifying and resolving this issue. Any comments would be welcome.
It seems you are encountering a complex issue in Abaqus 2020 related to coupling predefined fields with a UMAT subroutine. While it is difficult to pinpoint the exact cause without looking at the actual code and the complete setup of your simulation, here are some general strategies you can use to identify and possibly resolve the problem:
Remember, coupling predefined fields with user subroutines can be a complex process, and it may require a deep understanding of both the Abaqus system and your specific simulation to identify the cause of the problem. By working systematically and seeking assistance from experts or technical support if needed, you may be able to identify and resolve the issue.
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