Fatigue Life Analysis and Tests for Thick-Walled Cyclinders Including Effects ofOverstrain and Axial Grooves

摘要

A fracture mechanics-based fatigue life analysis was developed for pressurizedthick-walled cylinders autofrettaged by overstrain and with one or several semi-elliptical-shaped axial grooves at the inner diameter. The fatigue life for a crack initiating at the root of the groove was calculated for various cylinder, groove, and crack configurations and for different material yielding condition. Comparisons were made with fatigue crack growth and laboratory life results from A723 thick-walled cylinders in which cannon firing tests were first performed to produce axial erosion grooves. followed by cyclic hydraulic pressurization to failure in the laboratory. The life analysis, with an initial crack size based on