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EuaIuation of Fatigue of Fillet Welded Joints in Vehicle Components Under Multiaxial Service Loads 41

3. The coarse finite element model is unsuitable for usage in conjunction with the local stress
approach. Therefore, a submodel of the failure-critical detail has been created here. Due to
the finer mesh, the number of elements is increasing. The results obtained here show that
weld geometry optimisation is only possible with the local stress approach.
4. In general, higher numerical expense does only make sense, if failure-critical locations
should be investigated more exactly. In the majority of engineering applications, a finer
mesh or more detailed model is often an unrealisable option due to technical and
commercial reasons.
5. To calculate fatigue lives in accordance with the local stress approach, no experimental
input data are required, when using the universal local o-N curve.

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