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ST7-1.20.10.5 Nonlinear Static Convergence
A structural system can be considered nonlinear if the response is not linearly proportional to load. In reality, most systems are nonlinear, but can be considered linear within a reasonable load range. There are cases where the applied load may cause nonlinear effects. These include:
Material nonlinearity (e.g. yielding, changing stiffness, creep).
Geometric nonlinearity (e.g. buckling, membrane redistribution, mechanism behaviour).
Boundary nonlinearity (e.g. contact, compression-only...
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