Learning Forum

[zmohamma]

I’m trying to better understand the methods used by LS-DYNA contact cards for calculating friction forces. Are all contact types based solely on the Coulomb friction model? If so, it seems redundant to have over 100 contact cards in the software.

 

From what I’ve gathered, LS-DYNA first calculates the normal contact force—potentially using different approaches depending on the card—followed by a friction force typically based on a Coulomb model. However, it’s unclear to me why only one friction model would be used across so many different contact types, and I haven’t found any sources that clearly explain whether other friction models are implemented.

 

Are there any references or internal documentation sources that specifically discuss the underlying friction force formulations or coding implementations for LS-DYNA contact cards?

[Dennis Chen]

there are a ton of information in the ls-dyna theory manual.  try this link or go to the Ansys ls-dyna download page - https://ftp.lstc.com/anonymous/outgoing/web/ls-dyna_manuals/DRAFT/DRAFT_Theory.pdf

You can also check in this place - https://www.dynasupport.com/tutorial/ls-dyna-users-guide/contact-modeling-in-ls-dyna