7A04-T6高强铝合金板对平头杆弹抗侵彻行为的试验与数值模拟研究

司马玉洲1,肖新科1,王要沛2,张伟3

振动与冲击 ›› 2017, Vol. 36 ›› Issue (11) : 1-7.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (11) : 1-7.
论文

7A04-T6高强铝合金板对平头杆弹抗侵彻行为的试验与数值模拟研究

  • 司马玉洲1,肖新科1,王要沛2,张伟3
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 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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摘要

为了解高强铝合金对动能杆的抗侵彻性能,在一级轻气炮上开展了直径5.98 mm的平头刚性弹侵彻6 mm厚7A04-T6铝合金靶板的打靶试验,撞击速度范围为73.9-446.5 m/s。获得了弹体贯穿靶板后的剩余速度以及靶板的断裂行为,通过拟合初始-剩余速度数据得到了弹道极限。同时,在ABAQUS/Explicit中建立了三维有限元模型对打靶试验进行了数值计算,7A04-T6的力学行为通过Johnson-Cook本构模型和修正的Johnson-Cook断裂准则描述。试验结果表明,7A04-T6高强铝合金靶板在平头弹撞击下发生剪切冲塞,塞块表面有明显裂纹产生,弹道极限为156.0 m/s,剪切冲塞可在撞击速度不低于约0.90倍弹道极限时形成。数值仿真发现,有限元计算可成功再现靶板的剪切冲塞及冲塞表面的断裂;预报的弹道极限为168.8 m/s,比试验结果高约9%;撞击速度不低于0.92倍弹道极限时靶板发生剪切冲塞破坏,与试验结果十分接近。

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.

 

关键词

冲击动力学 / 金属靶板 / 打靶试验 / 数值模拟 / 弹道极限

Key words

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

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司马玉洲1,肖新科1,王要沛2,张伟3. 7A04-T6高强铝合金板对平头杆弹抗侵彻行为的试验与数值模拟研究[J]. 振动与冲击, 2017, 36(11): 1-7
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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