The weld module in LIMIT is used for the detailed assessment of seam welds. The following main features are offered:
- High flexibility since the actual weld geometry is not defined in the finite element model but in the post processing within LIMIT. This way different weld designs can be investigated without the necessity of additional FE analyses.
- Automated stress correction for nominal and structural hot spot stress concepts (see Stress Concepts Weld).
- Applicable to shell models and solid models using Sensors (see Sensor Technology).
- Different weld strength parameters depending on the loading direction with respect to the weld orientation are taken into account.
The following picture shows the stress components with respect to the local weld orientation. The components are the stress parallel to the weld, perpendicular to the weld and the shear stress. Standard assessment codes, such as FKM, EC3, DVS, define different fatigue strength parameters for each of these stress components.
- Computation of stresses in weld throats also taking into account additional bending in one-sided welds (see One Sided Welds). This is possible, since LIMIT calculates the section forces and moments along the welds and uses this information to calculate the stresses for different weld designs. The extraction of section forces and moments is simple in case of shell models, making this kind of modelling strategy very efficient for large thin walled structures such as railway cars or other lightweight structures.
- Multiple assessment points in order to cover all possible crack initiation spots of a welding in one run (see Assessment Points in Welds). LIMIT allows to cover all three failure modes, which are failure of the weld toe on either of the attached sheets or the weld root.