In the properties for a non linear contact for sol601 there is the "constraint function contact algorithm" section, in which there are 3 parameters, "normal constraint" "frictional constraint" and "compliance factor".
I looked in the manuals for the meaning and defenition for these parameters and didnt find any.
Could someone please explain what each of them mean?
The value of the Normal Constraint is used as a coefficient in calculating normal contact forces. If used, this adds the EPSN entry to the NX Nastran BCTPARA contact property card. It is recommended in most cases to leave this value along.
Frictional Constraint is used to provide a transition in the frictional stick-slip model.
Compliance Factor (CFACTOR1 on the BCTPARA card) is the factor used for allowing penetration between contact surfaces: penetration = CFACTOR1 ×normal contact pressure.
Please refer to the NX Nastran Advanced Nonlinear Theory and Modeling Guide, Sections 4.2.1 and 4.4.6 for more details. This is accessible by selecting the Help -> NX Nastran command, then select the NX Nastran 8.5 link on the left column, then select the Advanced Nonlinear Theory and Modeling Guide under the Nonlinear group.
Best Regards, Chip Fricke Principal Applications Engineer - Femap Product Development