AD TECHNICAL REPORT ARCCB-TR-97004 STRESS CONCENTRATION, STRESS INTENSITY, AND FATIGUE LIFETIME CALCULATIONS IN AUTOFRETTAGED TUBES CONTAINING AXIAL PERFORATIONS WITHIN THE WALL ANTHONY P. PARKER STEPHEN N. ENDERSBY TIMOTHY J. BOND JOHN H. UNDERWOOD SABRINA L. LEE JOHN HIGGINS FEBRUARY 1997 US ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER CLOSE COMBAT ARMAMENTS CENTER BENET LABORATORIES WATERVLIET, N.Y. 12189-4050 APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED 199704U Q51 DTIC QUALITY INSPECTED »