Geometrical Nonlinear and Material Nonlinear

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Geometrical Nonlinear

In the geometrical nonlinear case, the relationship internal force-displacements is nonlinear.

Material Nonlinaer

In the material nonlinear case, the relationship of the stress-strain is nonlinear.

Of course these cases may be independent of each other or combined.

  • From Czeslaw Kazimierz Szymczak: https://www.researchgate.net/post/What_is_Geomertical_Nonlinearity/2