759x
002615
2019-03-07

Question

When using plastic material, should I perform the calculation according to the second-order or large deformation analysis?


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. Thus, 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 analyzed, the calculation according to the linear static analysis is sufficient.