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September 20, 2022 at 2:05 pm
Andreas Koutras
Ansys Employee

Hello,

Is the thickness of the metal sheet shells very small? A small shell thickness can cause the contact to be released before expected. You can try to increase the contact stiffness by setting SOFT=1 in the *CONTACT optional card A, set the scale factors SFS and SMF to a low value (such as 1e-12), and increase the SOFSCL to 0.4. Otherwise, try with the segment-based contact invoked by SOFT=2. Details are available in the LS-DYNA Theory Manual under Section 29.7.

Note that AUTOMATIC contacts account by default for the shell thickness offset. 

Contact examples are available here:

https://www.dynaexamples.com/introduction/examples-manual/contact

Regards,

AK