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Can H-adaptive help us tell stress concentration or singularity if the stress is greater than yield strength?

Question asked by Felix Yang on Dec 14, 2018
Latest reply on Dec 15, 2018 by Felix Yang

Hi everyone, I met one problem and really need you guys to help me.

 

I used H-adaptive to attempt to get accurate results for static analysis. After 5 loops' calculation software said that the calculation has achieved 98% accuracy, so I thought the stress calculated must be accurate enough. But it turned out that my maximum stress is much greater than material's yield strength, which tells me I should consider using Non-linear and the maximum stress value may not be correct.

 

here is the problem, since stress value will not reach convergence if the singularity exists, those values will grow bigger with bigger increment every time I refine my mesh. But using h-adaptive is like having an automatic mesh refinement controlled by the software. Then reaching 98% similarity between calculated values from the closest two loops should give me an answer that stress has a tendency to convergent. But how could a static study using h-adaptive tell me the maximum stress of a yielded part?  Can H-adaptive help us tell stress concentration or singularity if the stress is greater than yield strength?

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