Accession Number : ADP009090

Title :   Dynamic Strain Waves and Permanent Bore Enlargement.

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

Personal Author(s) : Hasenbein, R. ; Hyland, E.

Report Date : SEP 1993

Pagination or Media Count : 26

Abstract : The purpose of this study was to explore the effect of dynamic strain waves on tube strength, specifically to determine whether they are capable of causing permanent radial expansion of the bore. To accomplish this, previous test firing of three tubes were studied. The first two (the 120-mm TT2 and the 105-mm CT2) were experimental tubes fired in the mid-1980s, and the third (the 120-mm M256) is the standard main gun for the M1A1 Abrams Tank. Inspection reports after test firings indicated that the first two tubes had undergone permanent radial expansion, despite having static factors of safety of 2.5 and 2.0 respectively. There are no known reports that the third tube experiences permanent bore deformations due to firing ammunition in current production. A non-linear, elastic-plastic, dynamic finite element analysis was performed that emulates firing tests of each of the above tubes. The analysis successfully reproduced the permanent bore dilations actually experienced by the first two tubes, and it also correctly predicted that the third tube would not fail in this manner.

Descriptors :   *FINITE ELEMENT ANALYSIS, *TANK GUNS, *DYNAMIC LOADS, AMMUNITION, BORES, DEFORMATION, DYNAMICS, EXPANSION, INSPECTION, SAFETY, STANDARDS, GUN BARRELS, FIRING TESTS(ORDNANCE).

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE