&nbsp;Experimental and numerical study on the ballistic performance of high strength 7A04-T6 aluminium alloy plate against blunt projectile impact

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (11) : 1-7.

Experimental and numerical study on the ballistic performance of high strength 7A04-T6 aluminium alloy plate against blunt projectile impact

Yuzhou SI-MA1 Xinke Xiao1 Yaopei Wang2 Wei Zhang3

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Abstract

Ballistic test of 6 mm thick 7A04-T6 aluminum alloy plate against 5.98 mm diameter rigid blunt projectile impact was conducted in a one-stage gas gun in the impact velocity of 73.9-446.5 m/s in order to learn the ballistic performance of high strength aluminum alloy against kinetic energy projectile impact. The projectile’s residual velocity after perforation and the fracture behavior of the target were recorded. By fitting the projectile’s initial versus residual velocity data, we obtain the ballistic limit velocity of the target. Meanwhile, numerical ballistic test was conducted by using 3D finite element model built in ABAQUS/Explicit, where the mechanical behavior of 7A04-T6 aluminum alloy was characterized by Johnson-Cook strength model and a modified Johnson-Cook fracture criterion. It was found experimentally that the high strength 7A04-T6 aluminum alloy plate under blunt projectile impact fails by shear plugging and obvious cracks can be observed in the surface of the plug. The ballistic limit is 156 m/s and the initial impact velocity enable shear plugging is about 90% of the ballistic limit. According to the numerical simulation, the finite element calculation can reproduce the shear plugging and the fracture pattern in the plugs. The ballistic limit is 168.8 m/s, i.e., 9% higher than that obtained in the test. It was also found that shear plugging comes into being when initial velocity is above about 92% of the ballistic limit, which is in close agreement with the experiment result.

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high velocity impact / metallic target / ballistic test / numerical simulation / ballistic limit velocity

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Yuzhou SI-MA1 Xinke Xiao1 Yaopei Wang2 Wei Zhang3. Experimental and numerical study on the ballistic performance of high strength 7A04-T6 aluminium alloy plate against blunt projectile impact[J]. Journal of Vibration and Shock, 2017, 36(11): 1-7

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