How does the Material Model - Plastic 1D work?

Answer

Currently, the plasticity for 1D elements only works in relation to the normal stresses in a member. This means that the interaction between an axial force and a moment is only possible. The shear force interaction is not taken into account. Furthermore, the stresses due to shear force are only calculated elastically.

When applying the plastic material model, it is also important to ensure a sufficient division of the elements since there is a cross-section generated internally at each Gauss point on the member element, where the stress is calculated and the stiffness is reduced to the re-distribution of internal forces, if necessary. For example, if increasing the number of divisions, the model may become unstable as the redistributions of stresses can no longer be performed, and thus there is too high loading in the cross-section.

It is generally recommended to use a division of "50" for member elements when using the plastic material model (see the figure).

Keywords

Plastic 1D

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  • Updated 8 November 2020

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