Accession Number : ADA293655

Title :   Fatigue Life and Fracture Analyses for the M185/M284 Breech Ring.

Descriptive Note : Final rept.,

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

Personal Author(s) : Underwood, J. H. ; Troiano, E. ; Kapusta, A. A.

PDF Url : ADA293655

Report Date : JAN 1995

Pagination or Media Count : 21

Abstract : Fracture mechanics and fatigue life analyses were performed for Ml85/M2S4 breech rings, with emphasis on ring Serial No. 1659, which failed during safe life testing after 109 pressure cycles. Mechanical and fracture properties from the breech rings were measured and used to perform yield-before-break fracture analysis. Scanning electron fractography was used to determine the size of defect present in ring Serial No. 1659 prior to laboratory testing and the types of cracking that occurred during laboratory testing. Mean fatigue life calculations were prepared for various sizes of defect and applied pressures, including the defect size measured from fractography. the pressure of the laboratory test, and the pressure of the rounds that are fired with this type of breech ring. (MM)

Descriptors :   *GUN BARRELS, *BREECH MECHANISMS, *RINGS, MECHANICAL PROPERTIES, FATIGUE LIFE, CRACKING(FRACTURING), TOUGHNESS, STRAIN(MECHANICS), FRACTURE(MECHANICS), ELECTRON MICROSCOPY, FRACTOGRAPHY, DEFECTS(MATERIALS), PRESSURE, SAFETY, MEAN, YIELD STRENGTH, GUNS, FAILURE(MECHANICS), CHARPY IMPACT TESTS, CLEAVAGE.

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE