Residual Stresses in Swage-autofrettaged Thick-walled Cylinders

Description

Autofrettage of thick-walled pressure vessels involves permanent expansion of the cylinder bores using hydraulic pressure or an oversize swage, and is used to increase the elastic strength of the cylinder. The beneficial residual stresses which produce this effect also retard the growth of fatigue cracks which may form at the bore surface on cyclic pressurization, and are therefore of major importance in determining the life of the cylinders which are fatigue-limited in operation., This report describes predictions of residual stress distributions and cylinder expansions for swage autogrettage of a large-calibre gun barrel forging, and evaluates these predictions by comparison with experimental residual stress determinations. (Author).

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