Accession Number : ADA290931

Title :   Fatigue Life Analysis and Tests for Thick-Walled Cyclinders Including Effects of Overstrain and Axial Grooves.

Descriptive Note : Final rept.,

Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Personal Author(s) : Underwood, J. H. ; Parker, A. P.

PDF Url : ADA290931

Report Date : SEP 1994

Pagination or Media Count : 24

Abstract : A fracture mechanics-based fatigue life analysis was developed for pressurized thick-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 the expected preexisting defects, gave a good - description of the crack growth and fatigue life of the tests for cylinders with and without grooves. General fatigue life calculations summarized important and configurational effects on the fatigue life design of overstrained cylinders, including effects of material yield strength, cylinder diameter ratio, stress concentration-factor, and initial crack size. (MM)

Descriptors :   *FATIGUE LIFE, *GUN BARRELS, STRESS ANALYSIS, STRAIN(MECHANICS), FRACTURE(MECHANICS), EROSION, CRACK PROPAGATION, CYLINDRICAL BODIES, YIELD STRENGTH, FAILURE(MECHANICS), GROOVING, CYCLIC LOADS, HYDRAULIC PRESSURE, AUTOFRETTAGE.

Subject Categories : Guns
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE