It is preferred to use solid geometry meshed with sweep method and Solid Shell element type . This is equivalent to using shell mesh, but it eliminates manual mid-surface pre-processing work.
It is preferred to model weld seams with the Add Welds instead of geometry parts. This allows for easy optimization of the weld configuration and throat thickness without updating geometry, contacts and mesh.
Nominal Stress Fatigue is mainly used for base material fatigue evaluation. Available stress types: Principal, Sum of Principal, Stress Intensity, Equivalent, Normal X/Y/Z, Shear XY/YZ/XZ. The geometric stress in Nominal Stress Fatigue can be derived using the Hot-Spot Stress Fatigue method.
Hot-Spot Stress Fatigue is recommended for weld fatigue evaluation of shells and solids. Available stress types: Normal (default), Parallel, Shear, Principal (no limit), Principal (IIW limit), Equivalent, Equivalent (DNV). Use “mesh inflation” to create at least one element between Hot-Spot and first interpolation line. Use “Weld mesh” method to create weld mesh connections and hot-spot imprints in a shell model.
Effective Notch Stress Fatigue is recommended for evaluation of the weld toe or weld root and requires detailed geometry and mesh preparation, min 4 elements in a 90° fillet.
Results are displayed if mesh is good enough. Check result item Life quality is 100% ±50%.