Metallurgical Examination of 1 inch and 2 inch Thick Cast Armor Used for the Development of 57mm and 105mm Proof Projectile Shock Tests
WATERTOWN ARSENAL LABS MA WATERTOWN ARSENAL United States
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Except for a few cases, the ballistic performance of 1-in and 2-in thick coat shock tested at velocities of 1000 and 1100 ft.sec. with 57 mm and 105 mm. proof projectiles respectively does not correlate with the shock properties of the armor as revealed by metallurgical tests. There is evidence that low hardness is the factor responsible for the failure of 1-in thick plates during the shock test. In general, the ballistic failures resulted from complete penetrations Army criterion rather than from breakage or excessive cracking. Complete penetrations are not considered reliable indices of the shock resistance of armor. As presently conducted, the subject ballistic shock tests are not considered satisfactory for inclusion in Specification AXS-492-5.