FAQ 002615 EN

7 March 2019

Frank Faulstich Calculation RFEM RF-MAT NL

Do I have to calculate according to the second-order or large deformation analysis when using plastic material?

Answer

No, it is not absolutely necessary to calculate according to the second-order or large deformation analysis when using a nonlinear material model. The material nonlinearity is also considered in the case of the calculation according to the linear static analysis.

The calculation according to the second-order analysis or the large deformation analysis means that the equilibrium is set on a deformed structure. So it is geometric nonlinearity.

The difference between the second-order and large deformation is that large rotation may occur in the case of the large deformation analysis.

Thus, if there is no stability problem or if the stability problem is further analysed, the calculation according to the linear static analysis is sufficient.

Keywords

Calculation Second-order analysis Large deformation analysis Plastic Nonlinear material model

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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