Why not define contact for every joint where it may apply?
A contact simulation is nonlinear and requires an iterative solution technique. This can increase run times by orders of magnitude when compared to running the same models without contact. Also, contact is only valid for small deflection Static simulations. It does not work for Modal, Vibration or Thermal simulations and does not support friction. For practical reasons you should limit the use of contact, applying it only where required.
Basic rules for using the contact option in Pro/MECHANICA:
Contact allows two surfaces to pull apart but they cannot penetrate.
The 2 surfaces must be parallel to within 36 degrees.
A normal vector somewhere on the first selected surface must intersect the second surface selected.
The maximum distance between the 2 surfaces must be less than half the average diagonal distance across the 2 surfaces.
MECHANICA does not support friction or sliding.
Contact may only be used between solid elements in models, no shell contact.
Contact analysis only works for static loads.
More contact simulation topics:
> Contact Definition
> Analysis and Convergence Definition
> Crack in the Model Error
> Insufficiently Constrained Error
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