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How does 1D work plastically?

Answer

Currently, the plasticity for 1D elements only works in relation to the normal stresses in a member, which means that only an interaction between axial force and moment is possible. The shear force interaction is not taken into account. In addition, the stresses from shear force are only calculated elastically. When using one of the plastic material models, it is also important to ensure a sufficient division of the elements, because a cross-section is generated internally on each Gauss point on the member element where the stress is calculated and, if necessary, a stiffness reduction for redistribution of internal forces is performed. If, for example, the number of divisions is increased, the model may become unstable because the redistributions of stresses can not be carried out any longer, which means that the loading in the cross-section is too high.

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

Keywords

Plastic 1D

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