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Fatigue Plots/Results

Question asked by James Jones on Oct 2, 2019
Latest reply on Oct 3, 2019 by Steven McCallion

Consider a cantilever loaded at one end with a zero based fatigue load bending it downwards. This causes positive first principal stress (tensile) in the top of the cantilever and compressive stress in the bottom of the cantilever. According to crack mechanics, only tensile stresses pull cracks apart and so fatigue is only ever due to positive first principal stresses. Why then, even when I check the tick box for P1 in the "computing alternating stress using" box, do I see equal amounts of fatigue damage in the top and the bottom of the cantilever? It doesn't make any sense to me. I have some complex analysis to do, but this issue is getting in the way. fatigue fatigue analysis solidworks simulation