Linear perturbation steps have no effect on subsequent general analysis steps. A general analysis step contributes to the response history of the system; a linear perturbation step allows the investigation of the linearized response of the system at any stage during the response history. Search Help. Model Setup Overview of how to build a finite element model. When a contact point opens, this is readily accomplished: the tensile force is set to zero, resulting in a force residual at the surfaces that were in contact.
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