Abstract
High pressure cylinders and gun barrels are known to fail by fatigue when subjected to pulsating internal pressures. Prior autofrettage and compounding with interference improves the fatigue life for a given pressure range. This paper presents methods for predicting the life of each cylinder accepting that failure may arise from the propagation of one or more cracks that continuously change their geometry, from straight to elliptical, as they penetrate the cylinder wall. A bounding method is employed, giving predictions for the most severe condition of fatigue failure resulting from a single, straight-fronted crack, to that of failure under the least severe stress intensity for 30 elliptical cracks in cylinders of Ni-Cr-Mo steel. It is shown that the propagation lives observed under higher repeated pressure ranges generally lie within these bounds for plain-bored and rifled-bored monobloc cylinders in both the unautofrettaged and autofrettaged conditions. Compounding analyses apply to plain-bored, two-component, shrink-fit cylinders, with components of the same and different materials. To account for the increased lives observed under lower pressure ranges, it is necessary to account for that portion of life expended initiating a crack. However, the initial condition of a cylinder bore is much less important to that portion of life consumed by initiation following an autofrettage treatment. The effect of mean stress in the fatigue cycle and the degree of autofrettage are also examined in the case of monobloc cylinders.
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© 1990 Elsevier Science Publishers Ltd
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Rees, D.W.A. (1990). Predicting Fatigue Failures in Thick-Walled Cylinders Under Pulsating Internal Pressure. In: Hyde, T.H., Ollerton, E. (eds) Applied Stress Analysis. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0779-9_1
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DOI: https://doi.org/10.1007/978-94-009-0779-9_1
Publisher Name: Springer, Dordrecht
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