Study on the influence of attack angle and incident angle on ballistic characteristics of projectiles penetration into thin concrete targets
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摘要: 为了研究弹体斜侵彻有限厚混凝土靶板的作用特性，开展了尖卵形弹体斜侵彻间隔混凝土靶实验，获得了弹体侵彻过程中的姿态及弹道特性、靶板破坏参数，分析了攻角与入射角联合作用对弹体侵彻混凝土靶板“二次偏转现象”、靶后偏转角以及弹体侵彻间隔靶板弹道轨迹的影响规律。研究结果表明：入射角越大，“二次偏转现象”越明显，弹体靶后偏转角越大；初始攻角抑制“二次偏转现象”，攻角越大，抑制作用越显著；初始攻角与入射角方向相同时，初始攻角加剧靶后偏转角的增大；当攻角与入射角方向相反时，较小的攻角能够抑制弹体靶后偏转角的增大，而当初始攻角较大时，攻角成为影响弹体偏转的主要因素，攻角越大，弹体靶后偏转角越大。Abstract: Experiments of a 30 mm ogive-nose projectile penetration into two layers of concrete targets are carried out to study the characteristics of projectile oblique penetrating a finite thickness concrete target. A high-speed camera was used to record the projectile deflection, velocity, and trajectory in the process of penetration. Vernier caliper and ruler were used to measure the size of the front and rear craters. The parameters of the perforation damage of the concrete slab and the ballistic parameters and trajectories were obtained. The influence law of attack angle and incident angle on the characteristics of perforation damage of concrete slab, attitude deflection during the perforation process, deflection angle after penetration, and ballistic trajectory are analyzed and studied. The experimental results show that there is a phenomenon of secondary deflection in the penetration process. With the increase of incident angle, the phenomenon of secondary deflection is more obvious. The initial attack angle inhibits the occurrence of the phenomenon of secondary deflection. With the increase of the attack angle, the inhibition effect is more significant. With the increase of the incident angle, the deflection angle after penetration increases gradually. Compared with the incident angle, the initial attack angle has a greater influence on the deflection angle behind the concrete target. The initial attack angle promotes the increase of the deflection angle after penetration when the initial attack angle is the same as the incident angle. When the initial attack angle is opposite to the incident, a small initial attack angle can inhibit the increase of the deflection angle after penetration, but a large one becomes the main factor affecting the deflection angle after penetration. The larger the initial attack angle, the larger the deflection angle after penetration.
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Key words:
- impact dynamics /
- penetration /
- spaced concrete targets /
- penetration trajectory /
- attack angle /
- deflection angle
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图 6 弹体侵彻间隔混凝土靶弹道参数示意图
Figure 6. Schematic of ballistic parameters of a projectile penetrating two spaced concrete targets
图 17 第1发实验弹体侵彻过程偏转变化
Figure 17. Change of projectile deflection angle in the first experiment
图 18 第2发实验弹体侵彻过程偏转变化
Figure 18. Change of projectile deflection angle in the second experiment
图 19 第3发实验弹体侵彻过程偏转变化
Figure 19. Change of projectile deflection angle in the third experiment
图 20 第4发实验弹体侵彻过程偏转变化
Figure 20. Change of projectile deflection angle in the fourth experiment
图 21 第5发实验弹体侵彻过程偏转变化
Figure 21. Change of projectile deflection angle in the fifth experiment
表 1 弹体参数
Table 1. Parameters of projectile
材料 K d/mm l/mm m/g Q c/mm 30CrMnSiNi2A 45～48 30 180 520 4 94 
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表 2 靶板破坏参数实验结果
Table 2. Destruction parameters of targets under different operating conditions
工况 v/(m·s−1) α/(°) φ/(°) vr/(m·s−1) Dch/mm Dcf /mm Dcr /mm Hcf/mm Hcr /mm Vcf/cm3 Vcr/cm3 1-1 791 −1.60 −1.33 700 67 347 287 57 43 715 993 1-2 700 −5.11 −3.08 602 70 297 314 49 51 897 1170 2-1 705 +14.41 −0.70 624 47 289 247 63 37 547 700 2-2 624 +12.67 −1.44 531 53 278 294 52 48 570 603 3-1 515 +11.05 −4.22 409 42 248 289 58 41 510 825 3-2 409 +3.89 −1.19 310 44 223 366 47 53 475 960 4-1 515 +28.54 −1.03 428 61 268 335 52 48 453 1090 4-2 428 +27.34 −2.35 263 64 359 388 46 54 875 1037 5-1 694 +28.28 −1.52 576 68 261 300 56 44 748 1055 5-2 576 +25.91 −2.11 472 59 302 340 57 43 720 995
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表 3 弹体侵彻每层混凝土靶板前后弹道参数
Table 3. Parameters of projectile penetration under different initial conditions
编号 v/(m·s−1) α/(°) φ/(°) v/(m·s−1) Δv/(m·s−1) Δβ/(°) 1-1 791 −1.60 −1.33 700 91 +3.51 1-2 700 −5.11 −3.08 602 98 +7.64 2-1 705 +14.41 −0.70 624 81 +0.74 2-2 624 +12.67 −1.44 531 93 +2.92 3-1 515 +11.05 −4.22 409 106 +7.36 3-2 409 +3.89 −1.19 310 99 −0.82 4-1 515 +28.54 −1.03 428 87 +1.80 4-2 428 +27.34 −2.35 263 165 +2.01 5-1 694 +28.28 −1.52 576 118 +3.17 5-2 576 +25.91 −2.11 472 104 +4.78
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