Welding Thin-Walled Projectiles for Penetrating Multi-Layered Reinforced Concrete Targets
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摘要: 为研究焊接薄壁侵彻弹体的技术可行性，进行了有限元数值仿真，并参考数值仿真结果设计了一组对比实验，利用100mm口径滑膛炮作为发射平台，开展了焊接薄壁弹体侵彻多层钢筋混凝土靶实验。通过实验对比分析了4种不同焊接薄壁弹体的结构响应和靶板破坏情况，优选出了较佳的头部焊接工艺和位置，并对尾部连接方式的强度进行了考核。研究结果可为焊接薄壁弹体的结构设计提供参考。Abstract: To appraise the technical feasibility of welding thin-walled projectile for penetrating multi-layered reinforced concrete targets, we used the finite element method to simulate the penetration process and designed a set of comparative tests based on the simulation results.The welded thin-walled projectiles were launched from a 100-mm-diameter, smooth-bore powder gun, impacting the multi-layered reinforced concrete targets.A comparative analysis of the structural response characteristics for four projectiles and the damaging effects on the targets were conducted, the optimal techniques and location on the projectile head for the welding were determined, and the joint strength of the projectile tail was measured.These results can serve as reference for the structural design of welded thin-walled projectiles.
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图 3 弹体侵彻多层钢筋混凝土靶的过程
Figure 3. Process of projectile perforation on the multi-layered reinforced concrete target
表 1 实验弹体参数
Table 1. Parameters of experimental projectiles
Projectile type m/(kg) Nose connection type Tail connection type Projectile Ⅰ 11.33 Electron beam welding Screw joint and argon arc welding Projectile Ⅱ 10.80 Electron beam welding Screw joint and argon arc welding Projectile Ⅲ 10.38 Carbon dioxide arc welding Entire machine Projectile Ⅳ 10.56 Carbon dioxide arc welding Entire machine 
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表 2 随炉试件力学性能检测结果
Table 2. Properties of heat treated specimens
Type Rp0.2/(MPa) Rm/(MPa) Z/(%) As/(%) Aku2/(J) 35CrMnSiA 1563 1917 11.4 42.5 48.3 Electron beam welding line 1534 1885 10.4 44.3 35.0 Carbon dioxide arc welding line 825 12 47 42.3
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表 3 混凝土材料参数
Table 3. Parameters of JHC model for reinforced concrete
ρ/(g/cm3) fc/(GPa) Ac Bp C Sfmax G/(GPa) D1 D2 N 2.4 0.045 0.79 1.60 0.007 7.0 14.86 0.04 1.0 0.61 εfmin T pcrush/(GPa) μcrush plock/(GPa) μlock K1/(GPa) K2/(GPa) K3/(GPa) $ {\dot \varepsilon _0}$ /(s-1) 0.01 0.004 0.016 0.001 0.8 0.001 0.085 -0.171 0.208 0.001
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表 4 35CrMnSiNiA材料本构模型参数
Table 4. Parameters of steel 35CrMnSiA for Johnson-Cook constitutive model
ρ/(g/cm3) E/(GPa) ν A1/(MPa) B1/(MPa) C1 n m Tm/(K) 7.85 210 0.29 1280 346 0.015 0.372 1.027 1775
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表 5 实验弹侵彻实验结果
Table 5. Experimental results of projectiles penetrating reinforced targets
Projectile type v/(m/s) Penetration results Recovered projectiles Projectile Ⅰ 403.5 Perforation of 5-layered targets Integrity Projectile Ⅱ 409.8 Perforation of 5-layered targets Fracture in welding line of nose and tail Projectile Ⅲ 406.5 Perforation of 5-layered targets Fracture in welding line of nose Projectile Ⅳ 418.5 Perforation of 5-layered targets Fracture in welding line of nose
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表 6 靶前漏斗坑尺寸
Table 6. Sizes of craters on the front surface of the reinforced cncrete targets
Proectiletype dh/(mm) dv/(mm) Dh/(mm) Dv/(mm) T1 T2 T3 T4 T5 T1 T2 T3 T4 T5 T1 T2 T3 T4 T5 T1 T2 T3 T4 T5 Projectile Ⅰ 110 110 110 120 140 110 140 150 205 190 240 190 180 150 190 190 170 190 260 230 Projectile Ⅱ 130 140 175 125 150 150 170 190 220 340 225 180 190 190 240 235 230 260 300 420 Projectile Ⅲ 110 110 130 140 220 110 110 130 145 150 230 170 210 180 260 260 190 180 170 240 Projectile Ⅳ 120 130 165 170 130 130 150 165 200 255 195 200 250 240 195 215 225 240 240 310
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