The LS-DYNA time step size should not exceed 1.003E-08 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface. too many prescribed nodal displacements for rigid body part ID 8 limit=1. Nodal list: *** Error 30006 (INI+6) initialization completed with 3 or more fatal errors please check messag file Memory required to begin solution : 9457818 Additional dynamically allocated memory: 4663760 Total: 14121578 *** Error 30006 (INI+6) initialization completed with 3 or more fatal errors please check messag file