What is the best way to transfer the force between solids and surfaces?

Answer

Since a surface is a 2D element and therefore the transition from surface to solid is a line, singularities may occur here. Especially the moments m-y and m-x may cause some problems.

The best way to create the transition consists is to use rigid members, as shown in Figure 01.

In this option, the rigid members cover the height/thickness of the surface, and thus ensure a clean introduction of the moment into the solid. Furthermore, the rigid members must protrude into the surface; the depth has been selected to be a half of the surface thickness.

Figure 02 shows the calculation results. The model without the rigid members has a large deformation, which illustrates the effect. However, the model with the rigid members shows the same deformation as the pure surface model or solid model in some cases.

Keywords

Modeling Volume Surface Transition Singularity

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RFEM Main Program
RFEM 5.xx

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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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