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Failure Analysis of the Lightweight Company Mortar System 60 mm Mortar Fin
ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ LARGE CALIBER WEAPONSYSTEMS LAB
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An investigation of the XM27 fin section was conducted to determine the failure mechanism associated with the longitudinal separation of the fins during test firings. The investigation implied that improper process controls during billet cooling resulted in microcracks, with high concentrations of magnesium and silicon in the area of the cracks. Upon extrusion, this defect was transferred to the extruded fin section resulting in fins which would not withstand the internal pressures attained during firing. Several recommendations are made to eliminate all defective fins from the final accepted parts. Author
APPROVED FOR PUBLIC RELEASE