Seam weld solution for solid-solid connection modeling

Even though the Specialist Durability method works nicely with simple shell modeling, the trend to faster prototyping on one hand and more computer power on the other hand leads to the fact that, especially for thicker sheet structures, more often a modeling by solid finite elements based on a simple CAD structure is used. [3]

These models do not include the modeling of the fictitious radii and cannot accurately predict the local notch stresses. While in shell structures an accurate load flow through the weld can be achieved directly by the element nodal forces in the weld connection, the load flow in a solid structure is much more complex. Therefore a new indirect approach has been developed in order to determine the loads by analyzing a complete set of structural stresses. [3]

For this new approach it is important that the solid modeling is first of all able to allow the correct load transfer trough the structure. While for shell modeling the load transfer may run over a line of nodes, for solids the connection must be modeled on the complete connection surface. For the application of the load flow-based methodology, you need to know:

• The structural stresses in a given distance in all sheets

• The weld connection line

Once this is known, you can back-calculate the forces and moments in the sheets at the weld connection line, shown in the following figure (). Those forces and moments are the same as if you would use shell modeling and take the element nodal forces in the connection line. Hence you can calculate the notch stresses in the same way as for shell structures (see the seam weld method) and apply the well proven fictitious radius approach (RxMS) for which the transition matrices are stored in the seam weld library. [3]

The Method Is Using All Structural Stresses to Back-Calculate the Load Transfer in the Connection

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Influence of the distance of the stresses to the weld line

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

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