Hi All,
I am simulating the development of oxide layers on metal and I have referred to the following paper:
How can I use a UMAT to set STRESS and STRAIN to zero in every increment?
- Training Expert asked 1 year ago
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Hello,
In the UMAT subroutine, you can set the stress and strain to zero, but you may encounter the convergence issue. In such cases, the stress and strain will usually be set to a value near zero to avoid convergence issues. Usually, the value is one-hundredth of the stress applied to the model. For example, the stress is applied to the steel in the MPa scale, so you should set the stress to 2 or 5.
If you have a problem writing the UMAT subroutine, I recommend referring to the links below.
https://caeassistant.com/blog/start-writing-your-1st-umat-in-abaqus-foundation/
https://caeassistant.com/blog/start-writing-your-1st-umat-for-abaqus-construction/
https://www.youtube.com/watch?v=96sfwnvLHkA
Best regards.
- Training Expert answered 1 year ago
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