A study on structural response characteristics of projectile penetrating on granite target
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摘要: 为探究弹体斜侵彻花岗岩靶体的结构响应特性,基于30 mm弹道炮平台,开展了弹体斜侵彻花岗岩靶试验,获得了非正侵彻作用下弹体结构破坏参数。在此基础上,结合数值模拟方法研究了弹体斜侵彻花岗岩靶的弹体结构变形及断裂机制,分析了侵彻初始条件对弹体结构响应的影响规律。研究结果表明:弹体非正侵彻花岗岩靶体时,易发生弯曲和断裂;弹体头尾部所受非对称力是影响弹体响应特性的主要因素,弹体的变形破坏程度由弹体头尾部角速度差峰值大小决定;随着攻角的增大,弹体弯曲程度线性增大,攻角增大到8°时,弹体发生断裂;随着着角的增大,弹体弯曲程度先增大后减小再增大,着角为15°时,弹体弯曲程度最小,着角达到30°时,弹体发生断裂;与着角相比,攻角对弹体结构响应行为的影响更显著;攻角与着角联合作用时,着角的引入会增大弹体临界断裂正攻角,负攻角会削弱弹体抵抗弯曲变形和断裂的能力;撞击速度高于
1600 m/s时,弹体撞击速度成为弹体产生不同响应行为的主控因素。Abstract: In order to explore the structural response characteristics of projectile obliquely penetrating granite target, based on a 30 mm ballistic gun platform, the tests of projectile obliquely penetrating granite target were carried out, and the damage parameters of projectile structure under non-normal penetration were obtained. On this basis, combined with the numerical simulation, the deformation and fracture mechanism of the projectile structure of the projectile obliquely penetrating the granite target are studied, and the influence of the initial conditions of penetration on the structural response of the projectile is analyzed. The results show that the projectile is prone to bending and fracture when it is not penetrating the granite target. The asymmetric force on the head and tail of the projectile is the main factor affecting the response characteristics of the projectile. The degree of deformation and failure of the projectile is determined by the peak value of the angular velocity difference between the head and tail of the projectile. As the yaw increases, the bending degree of the projectile increases linearly, and the projectile breaks when the yaw increases to 8°. With the increase of the impact angle, the bending degree of the projectile increases first, followed by decrease and then increase again. When the impact angle is 15°, the bending degree of the projectile is the smallest. When the impact angle reaches 30°, the projectile breaks. Compared with the impact angle, the yaw has a more significant effect on the response behavior of the projectile structure. When the yaw and impact angle are combined, the introduction of the impact angle will increase the critical fracture positive yaw of the projectile, and the negative yaw will weaken the ability of the projectile to resist bending deformation and fracture. When the impact velocity is greater than1600 m/s, the impact velocity of the projectile becomes the main controlling factor for the different response behaviors of the projectile.-
Key words:
- projectile /
- penetration /
- rock target /
- structural response
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表 1 弹体主要参数
Table 1. Main parameters of projectile
材料 d/mm l/mm CRH m/g ht/mm HRC 30CrMnSiNi2A 30 180 3 550 5 45-50 表 2 弹靶交会初始条件
Table 2. Initial condition of projectile-target intersection
试验编号 v0/(m·s−1) α/(°) β/(°) 1 467 −1.1 1.1 2 666 −3.0 3.0 3 749 2.3 2.3 4 792 −10.6 10.6 5 834 9.0 9.0 6 892 −3.5 3.5 表 3 弹体侵彻花岗岩靶的试验结果
Table 3. Test results of projectile penetrating granite target
试验编号 v0/(m·s−1) α/(°) β/(°) P/mm Vc/cm3 弹体结构破坏 1 467 −1.1 1.1 90 1660 侵蚀 2 666 −3.0 3.0 128 4360 − 3 749 2.3 2.3 137 5143 弯曲 4 792 −10.6 10.6 82 2318 断裂 5 834 9.0 9.0 93 2784 断裂 6 892 −3.5 3.5 168 10440 弯曲 表 4 不同工况下弹体的质量损失率与长度缩短率
Table 4. Mass loss rate and length shortening rate of projectile body under different working condition
试验编号 v0/(m·s−1) α/(°) β/(°) δ/% γ/% 1 467 −1.1 1.1 0.8 0.3 2 666 −3.0 3.0 − − 3 749 2.3 2.3 2.3 1.7 4 792 −10.6 10.6 22.3 55.6 5 834 9.0 9.0 − 61.1 6 892 −3.5 3.5 4.0 3.06 材料 ρ/(g·cm−3) E/GPa A/MPa B/MPa n C v 30CrMnSiNi2A 7.85 210 1314 1028 0.479 0.019 0.3 ρ/(g·cm−3) G/GPa fc/MPa ft* fs* A1/GPa A2/GPa A3/GPa B0 B1 2.66 21.9 167.8 0.04 0.21 25.7 37.84 21.29 1.22 1.22 T1/GPa Pel/MPa Pco/GPa α0 n A N Q0 B βc 25.7 125 6.0 1.0 3.0 2.44 0.76 0.68 0.05 0.026 βt Af nf g*c g*t ξ D1 D2 ε 0.007 1.78 0.80 0.53 0.7 0.5 0.04 1.0 0.015 -
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