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ST7-R3.20.10.2 Nonlinear Analysis Basics
This Webnote presents an overview of some of the basic concepts of nonlinear analysis, including iteration, load increments (or load steps), convergence and residual forces. Most nonlinear problems are solved by an iterative numerical procedure that needs to converge before the results can be accepted. Not all nonlinear problems are guaranteed to converge. However, convergence can often be improved by adjusting some of the solver parameters, depending on the model, the loads, and so on. Non-convergence can occur when attempting to solve for a physically impossible situation, or when the nonlinear solution algorithm is not sufficiently robust to solve a difficult nonlinear problem.
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