Reply To: Lsdyna rolling process,negative volume

[Pedram Samadian]

Hi,

It can have several reasons, including large time steps, inappropriate material model, contact issue, and so on. Please use the provided advice in the previous comments. For mass scaling, use the *CONTROL_TIMESTEP card in the LS-DYNA to ensure the time step adheres to the Courant’s stability criterion. Revisit the defined contact parameters. Use a proper value for the parameter “Soft” in the optional card A for the contact defintion. 

Details about the mentioned cards can be found in the LS-DYNA Keyword User’s Manual Vol. 1 (LSDYNA Manuals).

Thanks,

Pedram