Seam weld solution for shell-solid connection modeling

The shell-solid connection method for seam welds was developed to fulfill the need to connect sheets with casted structures. Especially for aluminum or hybrid (such as steel/aluminum) components (frames, axles), which are more and more used in lightweight engineering, this is becoming a typical connection type. The typical modeling technique in these cases is to model the sheets with shell elements and the casted part with solid elements. To transfer the loads weighted spiders are used to model the connections (see the following figure). The latter is true even if a compatible meshing would be available, as the rotational degrees of freedom need to be transferred. An alternative approach would be to use a shell skinning technique on the solid part to obtain a load transfer evaluation that is equivalent to the standard shell-shell approach. [3]

Shell - Solid Connection Using Weighted Spiders

For the shell-solid connection, modeling the number of possible connections is reduced compared to the general case and some additional modeling guidelines are needed. Typical connections are Y-joints and corner joints, but the modeling can also be used for butt joints.

Once the loads transfer is achieved, the same principle as for the shell-shell, solid-solid connections can be used. The solid part is assumed to be infinite in the sub-modeling case. This means that new fine models are created. [3]

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The development of a weld detail library

The detail model

The load cases

Defining the local stress components

The coarse model

The transition matrix

Seam weld solution for shell-shell connection modeling

Seam weld solution for solid-solid connection modeling

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Seam weld solution for shell-solid connection modeling, Simcenter 3D 2021.1 Series

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