Plane Strain and Axysymetric models are very effective for comparing
various weld joint geometries for life comparisons. In the above
example, using a life regression exponent of 3 (or .333 depending on
your formula), the top weld joint is predicted to live through 73% more
cycles than the second weld joint. These computations little models
provide stress concentrations for the weld toe or root that give a more
accurate prediction based on the actual joint design and possibly as
fabricated geometry as opposed to a hot-spot extrapolation.
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