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Hello Abaqus users,
I’m writing UMAT for fatigue analysis. I use direct cyclic step for calculations. My properties depend on N cycles or total time. Do you know how to define the total time step or a number of cycles in UMAT?
Now, I calculate the total time by KINC parameter (increment number). It works fine until my results converge. If not, the total time reset to zero, but the increment number does not. I tried to call TIME(1) and TIME(2), but they just show step time, not the total time.
Abaqus experts, how to address this problem?
CAE Assistant in Social Media Abaqus   ResearchGate   UMAT   fatigue
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Hi,

I didn’t understand your question. However, when you want to use a subroutine to simulate fatigue in the composite structures, you define steps, and for each step, you define a specified number of cycles. Then, you can observe the effects of fatigue on material properties in each step.

I recommend checking the link below. You will learn many things about implementing subroutines to simulate composite fatigue. https://caeassistant.com/product/composite-fatigue-simulation-with-subroutine/

Best regards.

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