Rigid-body critical transformation velocity of a high-strength steel projectile penetrating concrete targets at high velocities
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摘要: 刚体临界侵彻速度的理论准确预测分析是高强钢弹体高速侵彻混凝土靶研究中的关键问题,本文中利用二级轻气炮开展了克级高强钢(G50)卵形头长杆弹以
1010 ~1660 m/s的速度侵彻C40混凝土靶实验研究,获取了刚体临界侵彻速度和侵彻深度实验数据,并开展了刚体临界侵彻速度和考虑弹体头部磨蚀的侵彻深度理论分析,得到结论如下:(1)克级G50卵形头长杆弹侵彻C40混凝土靶时的刚体临界侵彻速度区间为1320 ~1520 m/s;(2)基于已有侵彻模型,建立了新的刚体临界侵彻速度理论模型,模型计算结果与本文及文献中的系列实验结果吻合较好;(3)建立了考虑头部侵蚀的侵彻深度模型,与实验结果吻合较好;(4)弹体屈服强度对刚体临界侵彻速度有显著影响,靶体无围压抗压强度对刚体临界侵彻速度有较小影响,实验前的弹体头形系数和弹体尺寸对刚体临界侵彻速度无显著影响。Abstract: The accurate prediction of the critical penetration speed of a rigid body is a key issue in the study of high-strength steel projectile penetration into concrete targets at high velocities. This paper conducts experimental research on the penetration of C40 concrete targets by high-strength steel (G50) ogive-nosed long rod projectiles at the velocities of1010 to1660 m/s using a two-stage light gas gun, obtaining experimental data on the critical penetration velocity and penetration depth of the rigid body. Theoretical analysis of the critical penetration velocity of the rigid body and the penetration depth considering the projectile head erosion is also carried out, and the following conclusions are drawn: (1) the interval of the critical penetration velocity for G50 ogive-nosed long rod projectiles penetrating C40 concrete targets is1320 to1520 m/s; (2) based on existing penetration models, a new theoretical model for the critical penetration velocity of the rigid body was established, and the calculated results of the model are in good agreement with the experimental results of this paper and the literature; (3) a penetration depth model considering head erosion was established, which also matches the experimental results well; (4) the yield strength of the projectile has a significant effect on the critical penetration velocity of the rigid body, the unconfined compressive strength of the target has a minor effect on the critical penetration velocity, and the shape coefficient and size of the projectile before the experiment have no significant effect on the critical penetration velocity. -
表 1 高速侵彻实验结果
Table 1. High-velocity penetration experiment results
实验编号 ν0/(m∙s−1) P/mm Lpr/mm βL/% Mpr/g βm/% 1 1 010 193 30.30 2.8 1.70 2.2 2 1 150 215 30.00 3.9 1.67 3.3 3 1 320 255 28.70 10.6 1.62 5.8 4 1 410 250 29.28 8.8 1.56 9.1 5 1 520 175 20.90 33.0 1.22 29.1 6 1 660 120 14.77 54.0 0.96 44.0 表 2 不同弹靶组合得到的刚体临界侵彻速度实验值与计算值的对比
Table 2. Comparison of experimental and calculated critical rigid-body penetration velocities obtained by different projectile-target combinations
编号 $ \psi $ 弹体材料 σs/MPa m0/g fc/MPa vr/(m∙s−1) 实验 计算 Case 1[4] 4.25 60Si2Mn 1200 约150 76.4 1120 ~1430 1194 Case 2[4] 4.25 60Si2Mn 1200 约150 61.3 1110 ~1470 1215 Case 3[4] 4.25 60Si2Mn 1200 约150 48.6 1140 ~1410 1235 Case 4[4] 9.25 60Si2Mn 1200 约150 48.6 1120 ~1345 1235 Case 5[4] 4.25 35CrMnSi 1275 约150 76.4 1235 ~1385 1244 Case 6[4] 4.25 60Si2Mn 1200 约150 34.8 1180 ~1420 1260 Case 10[4] 4.25 40CrNiMo 1610 约150 76.4 > 1390 1448 Case 7[1] 4.25 4340 钢1258 478 62.8 1024 ~1224 1251 Case 8[1] 4.25 4340 钢1258 1600 51 1201 ~1358 1269 Case 9本文 3 G50 1340 1.72 42.7 1320 ~1520 1335 -
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