I have question : how to achieve contact with option infinite friction ?
generally there is option contact type hard or linear and second row friction
Specify very high value of the friction coefficient. It’s bad for convergence though. CalculiX, unlike Abaqus, doesn’t have rough friction type.
generally there is for contact analysis in first row hard and in second row friction could you explain how it behave ?
Hard contact is for the normal direction. In theory, it means that once surfaces come into contact, any contact pressure can occur between them. From Abaqus documentation:
In practice, hard contact in CalculiX is just linear pressure-overclosure relationship with the default constants (for stiffness it’s the first Young’s modulus in the input file times 50) and is enforced with penalty method allowing some small penetrations. Of course, you can adjust the constants which is very often done in CalculiX. You can find some recommendations on the CalculiX forum where it was discussed extensively.
Friction is simple. That’s the behavior in the tangential direction, Coulomb friction model where you mainly specify the coefficient of friction or just omit it / set it to zero which means frictionless contact.
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