http://www.cadfamily.com/downinfo/301387.html
When you work with the Analysis workbench, three types of hypotheses are made:
Small displacements (translation and rotation)
Small strain
Linear constitutive law: linear elasticity
Thus, If there is no contact feature (either virtual or real), no pressure fitting property and no bolt
tightening (being virtual or not) feature, then the problem is linear, which means that the displacement
is a linear function of the load.
On the other hand, If there is at least one contact feature (either virtual or real) or pressure fitting
property or bolt tightening (being virtual or not) feature, then the problem is non linear, which means
that the displacement is a non linear function of the load.
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