Is it possible to define different stiffnesses for tension and compression between two surfaces in the diagram of a line release?

Answer

The definition of different properties in the tension and compression area of a line release is possible as shown in Figure 01.

However, it is necessary to consider a special feature property of the released surface in the case of a line release between two surfaces. In the attached model, an identical line release is defined. In the left model, the bottom Surface 1 is released, but in the right model, the top Surface 4 is released. For both surfaces, the local y‑axis of the surface is aligned parallel to the global z‑axis.

The deformation diagram results in completely different deformations for both models.

In the left model with the lower released surface, the pressed area is very soft. For this axis orientation, the reaction force of Surface 2, pressing on Surface 1 from above is very soft.

In the model on the right, the upper surface is released, so that the reaction force of Surface 4 pressing on Surface 3 from above is very rigid.

Keywords

Reaction force Action force Diagram Stiffness

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