Large linear model with many CEs (i.e. MPC bonded contact pairs) generates incorrect reactions in ANSYS 8.1.
What is the cause? What is the workaround?

This is a Class 3 Error in ANSYS 8.1 (Ref ONYX Defect report #26142). The cause can be traced to the need to update constraint equations between iterations. It is a very rare occurrence and cannot be reproduced with small models. The workaround is to run nonlinear analysis (NLGEOM,ON).

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