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Non-convergent simulation Hypermesh Optistruct (NonLinearStatic)

Hi everyone,

I'm running a model to simulate delamination in mode II. The model has two substrates and a layer of cohesive elements in between them. The simulation does not converge and it is giving me this graphical representation of the problem. Can anybody help me?

Thank you in advance

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Accepted answers

FaroukMaabs

Hello,

You should correct the orientation of the CIFHEX elements to ensure proper behavior.
Additionally, since LGDISP is enabled, I recommend including the CONSLI option in your contact definition.
It would also be beneficial to use a smaller increment size in the NLPARM settings to improve convergence stability.

Please try the proposed setup and let me know if the issue persists.

Rgds,

All comments

FaroukMaabs

Hello,

Could you please share the model?

Thanks,

Penarol

Absolutely, thank you

enf_paper2.fem

FaroukMaabs

Hello,

Please try the proposed setup and let me know if the issue persists.

Rgds,

FaroukMaabs

Hello,

Please try the proposed setup and let me know if the issue persists.

Rgds,

Penarol

I have switched the faces of the cohesives and added the option CONSLI and it has converged now but there is still something I don't get.
As you can see from the picture, despite reaching complete damage, the cohesive elements remain in place and do not get removed or disconnected from the substrates.

How can I solve this issue?

Thank you in advance for your time!