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Do you agree that a purely hinged flat head will only have (general) primary bending stresses? IMHO there are two cases: if you calculate the primary bending stress as if the flat head was purely hinged (often primary stresses are calculated by formula), then all other bending stresses due to the restraint at the periphery will be secondary, but if you calculate the bending with a model of the actual boundary restraint, then you'll have to classify the bending at the periphery as primary general.there will be some secondary bending stress due to straining of the flat head in order to reach some curvature