Damage accumulation simulation and residual performance evaluation of ceramic ballistic plate under the multi-hit strikes
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摘要: 陶瓷/纤维材料复合防弹板广泛应用于单兵防护装备,研究其抗多发冲击性能对于减少士兵伤亡有重要意义。基于53式7.62 mm穿燃弹冲击 SiC/UHMWPE 防弹板工况,利用数值模拟方法对多次冲击下防弹板的破坏分布和残余抗弹性能进行分析。利用陶瓷、纤维破坏及粘结面剥离程度表征整板损伤,并建立不同损伤区域下防弹板残余性能的分布规律。结果表明:第一次冲击下,防弹板损伤半径(R)为30 mm,当R<15 mm时,损伤(D)大于0.6,靶板无法抵御第二发子弹冲击;两次冲击下,两发子弹间距(ΔL)小于50 mm时,中间破坏区损伤有明显累加现象,当ΔL>50 mm时,损伤累加效应不显著。将防弹板以5 mm×5 mm网格离散,得到不同损伤面积占比,得出在两次冲击下整板穿透概率为0.94%。三次冲击下的整板穿透概率与第二次冲击位置有关,且当ΔL=20 mm时,三次冲击下整板穿透概率达到1.94%。Abstract: The ceramic/fibre composite ballistic panels are widely used in personal protection equipment, and the performance of the ballistic plate under multiple impact loadings are important to keep soldiers safe. The numerical simulation was used to analyze the failure distribution and residual ballistic performance of ballistic panels subjected to multiple impacting, and specifically focusing on the operating condition of 53-type 7.62 mm armor-piercing bullet impacting SiC/UHMWPE ballistic panels. The damage of the ballistic plate was characterized by the ceramic failure, fiber deformation and bond surface stripping, and the residual properties of the bulletproof plate with different damage were established. The results show that the damage radius (R) of ballistic panels is 30 mm under the first impact, and the damage (D) is greater than 0.6 when R<15 mm, and the target can't resist the second bullet impacting. Under two impacts, the damage in the middle zone becomes seriously when the distance between two bullets (ΔL) is less than 50 mm, and the cumulative effect of damage is not significant when ΔL>50 mm. Ballistic panels are discretized with 5 mm×5 mm grid, and the proportions of different damage areas are obtained. The penetration probability of the integral ballistic plate is 0.94% under the two impacts' loadings. The penetration probability of the integral ballistic plate under the third impacting is decided by the striking distance of the first two impacts, and the penetration probability by the third impacting is 1.94% when ΔL=20 mm.
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Key words:
- ceramic composite armor /
- failure characteristics /
- finite element analysis /
- impact point /
- multi-hit
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Parameter ρ/(g·cm−3) G/GPa A/GPa B/GPa n C $\dot \varepsilon _0^{}{\text{ /} }{ {\text{s} }^{ {{ - 1} } } }$ m Steel 7.85 206 1900 1100 0.065 0.05 1.0 1.0 Copper 8.96 124 90 292 0.31 0.025 1.0 1.09 Parameter t0/K tm/K D1 D2 D3 D4 D5 Steel 300 1800 0.2 — — — — Copper 300 1356 0.54 4.89 -3.03 0.014 1.12 Notes: ρ−Density; G−Shear modulus; A−Static yield strength; B−Strain hardening coefficient; n−Strain hardening exponent; C−Strain rate coefficient; ${\varepsilon }_{0}^{\dot{} }\text{ }$−Reference Strain rate; m−Thermal softening exponent; t0−Reference temperature; tm−Melting temperature; D−Damage constant. Parameter E1/GPa E2=E3/GPa ν12=ν31 ν23 G12/GPa G13/GPa G23/GPa UHMWPE 153 11.3 0.3 0.4 6 6 3.6 Parameter Xc/MPa Xt/MPa Yc/MPa Yt/MPa Zc/MPa Zt/MPa UHMWPE 2537 1580 2537 1580 340 180 Notes:E1, E2, E3−Elastic modulus in x, y and z directions, respectively; v12, v13, v23−Poisson's ratios; G12, G23, G13−Shear modulus; XC, XT, YC, YT, ZC, ZT−Compressive and tensile strengths in x, y, z directions. Parameter ρ/(g·cm−3) G/GPa A B C M N T/GPa SiC 3.125 193 0.96 0.35 0.009 1.0 0.65 0.75 Parameter PHEL/GPa D1 D2 β K1/GPa K2/GPa K3/GPa SiC 5.13 0.48 0.48 1.0 220 361 0 Notes:ρ−Density; G−Shear modulus; A−Intact strength coefficient; B−Fracture strength coefficient; C−Strain rate coefficient; M−Fracture strength exponent; N−Intact strength exponent; T−Maximum tensile pressure strength; PHEL−Pressure at HEL; D1−Damage coefficient; D2−Damage coefficient; K1−Bulk modulus; K2−Pressure coefficient. Parameter Numeric value K/(MPa·mm−1) 106 N/MPa 30 S/MPa 80 T/MPa 80 GI/(kJ·mm−2 ) 0.31 GI/(kJ·mm−2 ) 0.63 GIII/(kJ·mm−2 ) 0.63 Notes:K−Initial stiffness; N, S, T−Corresponding normal and shear strengths; GI, GII and GIII−Critical energy release rates of Model I, II and III. 表 5 子弹冲击SiC/UHMWPE实验结果与数值模拟结果比对
Table 5. Comparison between experimental results of bullet impact SiC/UHMWPE with numerical simulation results
Bullet velocity
/(m·s-1)Depth of penetration/mm Dorsal convex height/mm Mean to diameter
/mmCitations 808 6.7 1.5 25.5 Numerical simulation 808 7 1.6 23.67 表 6 第二发子弹穿透SiC/UHMWPE板概率
Table 6. Probability of the second bullet penetrate the SiC/UHMWPE plate
Penetration conditions Probability/% Ps2 3.77 Pp2 25.00 P02 0.94 Notes:Ps3−Probability that the second bullet will hit the damaged area; Pp3−Probability of a second bullet penetrating the damaged area; P03−Probability of the second bullet penetrating. 表 7 第三发子弹穿透SiC/UHMWPE板概率
Table 7. Probability of the third bullet penetrate the SiC/UHMWPE plate
Penetration
conditionsΔL/mm 15 20 35 50 80 Ps3 5.92% 7.40% 7.42% 8.9% 9.2% Pp3 26.07% 26.24% 25.53% 21.18% 20.49% P03 1.54% 1.94% 1.89% 1.89% 1.89% Notes:Ps3−Probability of the third bullet hitting the damage area of the second bullet; Pp3−Probability of the third bullet penetrating the damage area of the second bullet; P03−Probability of penetration of the third bullet. -
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