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A6FEA, this is a quite late answer, but the reason you do not get an answer here, is that this is not the right forum. There is no chance to do a vibration fatigue analysis with NASTRAN alone. Vibration fatigue typically has two diffrent loading conditions: random excitations (defined by a...

marine59, the singularity is an artifical one in the stress field modelling a seam weld connection just by connecting shells. That's in fact the reason to look in the lement nodal forces and moments that have no singularity in the weld line. And yes the singularity is not a mesh size problem...

Let me just give an idea on the difficulties in weld assessment and the ideas to solve them. The main problem is that the local geometry of a weld is complex not known before manufacturing Due to the complexity one wants to avoid to model the weld in the finite element model, wherefore one...

Dear all, just a few comments to this problem. In principle a strain-life approach using the four events one after the other. Due to the low number of complete cycles one has to take the cycles that occur due to the consequtive loading of the different events into account, as well. Software...