Prediction of Ballistic Limit of Composite GFRP Sandwich Panels under Hypervelocity Impact
doi: 10.11858/gywlxb.20170529
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摘要: 研究了玻璃纤维复合三明治板在圆柱形平头弹体打击下的预测弹道极限的理论预测方法。建立了玻璃纤维复合三明治板的三阶段侵彻模型，包括侵彻面板阶段、侵彻复合材料夹芯层阶段和侵彻内板阶段。基于高速弹体侵彻下靶板的局部变形假设建立了理论关系，将弹体侵彻复合材料夹心层时视为刚体处理，面板和背板的侵彻阶段考虑了弹体的墩粗效应和靶板的绝热剪切效应。基于能量平衡原理，推导了复合材料三明治板的弹道极限，并将理论计算结果与实验结果进行对比和分析，研究了不同侵彻速度、弹体质量和夹心层厚度对弹道极限的影响。结果表明，理论计算结果与实验结果具有较好的一致性。Abstract: In the present study, analytical solutions were presented for the prediction of the penetration and perforation of composite glass fiber-reinforced plastic (GFRP) sandwich panels struck normally by flat-nosed cylindrical projectiles over a wide range of impacting velocities, projectile mass and core thickness.The analysis model involved a three-stage perforation process including perforation of the front steel skin, the GFRP core, and the back steel skin.The formulation were based on assumptions that the deformations of steel skins are localized and the projectile is considered as a rigid body in the perforation of GFRP composite laminate.The energy absorption of the front and back steel skins and the GFRP core were estimated with the upsetting effect of the projectile and the adiabatic shear effect of the steel skins taken into consideration.In addition, based on the energy balance, the ballistic limit of the sandwich panel were obtained and compared with the available experimental results.The results show that the analytical predictions are in good agreement with the available experimental data.
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Key words:
- ballistic impact /
- sandwich panel /
- glass fiber reinforced /
- ballistic limit
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Figure 1. Schematic diagram of composite sandwich panels under impact of flat-nose cylindrical projectile
Figure 10. Experimental data of sandwich composite panels with a 60 mm thick GFRP core under impact of flat-nosed cylindrical projectile
Figure 11. Ballistic limit changing with the GFRP core thickness under impact of a 40 g flat-nosed cylindrical projectile
Figure 12. Ballistic limit of composite GFRP sandwich panels with a 60 mm thick core changing with the mass of projectile
Table 1. Mechanical and geometrical properties of steel skins
hf/mm hb/mm ρf/(kg·m-3) σu/MPa n γi 6.2 10.6 7 850 779 0.586 1.4 
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Table 2. Comparison of ballistic limit computed by theoretical model with experimental results
Mass/g Core thickness/mm Exp. value/(m·s-1) Calc. value/(m·s-1) Error/% 40 40 753.8 831.9 10.7 30 60 1 422.9 1 402.9 ─ 40 60 1 162.7 1 132.4 2.6 50 60 974.1 958.1 1.6 50 75 879.0 1 144.7 ─
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Table 3. Energy absorption ratio of composite GFRP sandwich panels under impact of flat-nosed cylindrical projectile with ballistic limit velocity
Mass/g Core thickness/mm (Efro/Eabs)/% (Ecor/Eabs)/% (Ebac/Eabs)/% 40 40 2.9 90.7 6.4 30 60 1.6 95.0 3.4 40 60 1.4 95.7 2.9 50 60 1.8 94.4 3.8 50 75 1.2 96.1 2.7
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