The development of a weld detail library

Specialist Durability offers an extensive library of weld detail joints. The detail models account for structural parameters, such as sheet thickness and joint angles. [1]

The idea implemented behind the Specialist Durability seam weld method is based on using coarser mesh models (to increase computational efficiency) in combination with the detail models of the seam welds (to obtain the desired accuracy of the fatigue life of the seam weld). For each detail model a set of potentially critical elements is identified for which the influence of a set of specific load cases is analyzed. The number of the critical element depends on the type of seam weld. The coarse models are used to calculate the load flow through the structure for all the load cases. In the coarse models the forces at the nodes of the seam weld are chosen to be the quantities representing the loading situation. The nodal forces that are applied on the fine mesh model are the nodal forces that are acting on the corresponding nodes of the coarse mesh model. Use of the nodal forces, directly delivered by the FEA, rather than the weakly defined structural stresses, which undergo all kinds of derivation procedures, has proven to be critical for this new approach. [1] Considering both the forces in the coarse model and the local stresses in the detail model a transition matrix from forces to local stresses can be derived. This transition matrix, characteristic for each seam weld, is then stored in the weld detail library.

Specialist Durability allows extending the weld library with non-standard models. This means that companies can define their own company-specific nominal weld geometries (FE models) and transition matrices.

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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

Seam weld solution for shell-solid connection modeling

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The development of a weld detail library, Simcenter 3D 2021.1 Series

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