Jh. Underwood et Ap. Parker, FATIGUE LIFE ANALYSES AND TESTS FOR THICK-WALL CYLINDERS INCLUDING EFFECTS OF OVERSTRAIN AND AXIAL GROOVES, Journal of pressure vessel technology, 117(3), 1995, pp. 222-226
A fracture mechanics-based fatigue life analysis was developed for ove
rstrained, pressurized thick-wall cylinders with one or several semi-e
lliptical-shaped axial grooves at the inner diameter. The fatigue life
for a crack initiating at the root of the groove was calculated for v
arious cylinder, groove, and crack configurations and for different ma
terial yielding conditions. Comparisons were made with fatigue crack g
rowth and laboratory life results from A723 thick-wall cylinders, in w
hich cannon firing rests were first performed to produce axial erosion
grooves; followed by cyclic hydraulic pressurization to failure in th
e laboratory. The life analysis, with an initial crack size based on t
he expected pre-existing defects, gave a good description of the crack
growth and fatigue life of the tests for cylinders with and without g
rooves. General fatigue life calculations summarized important materia
l and configurational effects on the fatigue life design of overstrain
ed cylinders, including effects of material yield strength, cylinder d
iameter ratio, stress concentration factor, and initial crack size.