Defining the local stress components

When defining the number of local stress components, two things need to be considered. On the one hand, the local stress components should cover all critical regions and all local stress states of the detail model. On the other hand, the fatigue analysis is done on all stress components. Thus, including more local stress components will result in an increase in computation time. Therefore, the most critical locations are determined for each load case and each stress component.

In the case of the T-joint described in The load cases, there are eight load cases and three stress tensor components (only the plane stress at the surface is taken into account) leading to 24 critical stress components. Most probably a lot of them will coincide so that only a much smaller number has to be taken. The minimum number is one critical location for each tensor component leading to three stress components at minimum.

For the local stress calculation, it is assumed that the direction perpendicular to the seam weld corresponds to the x-direction in the local coordinate system of the element in the notch. The direction parallel to the seam weld corresponds to the local y-direction. The superscripts denote the element/node ID of the remaining nodes and # is the number of load cases. With these notations, the matrix σk looks like the following table.

	LC1	...	CL#
		...
		...
		...
...	...	...	...
		...
		...
		...

Selected Critical Stress for the Different Load Cases for a T-Joint Fine Seam Weld Model

This procedure can be repeated for each notch of the detail model. The resulting matrices are combined to get the total matrix for the seam weld detail.

Learn more

The development of a weld detail library

The detail model

The load cases

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

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Defining the local stress components, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });