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What do you need to know before using SOLIDWORKS Non-linear Simulation?

The concept of nonlinear
Linear static analysis assumes that the relationship between loads and the induced response is linear. For example, if you double the magnitude of loads, the response (displacements, strains, stresses, reaction forces, etc.), will also double. 
All real structures behave nonlinearly in one way or another at some level of loading. In many other cases, the linear solution can produce erroneous results because the assumptions upon which it is based are violated. Nonlinearity can be caused by the material behaviour, large displacements, and contact conditions. In the nonlinear static analysis, dynamic effects like inertial and damping forces are not considered. Processing a nonlinear study differs from processing a static study in the following ways:

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