陶瓷复合装甲抗侵彻能力数值模拟

【作者】 孙娟；

【导师】 黄小忠； 杜作娟；

【作者基本信息】 中南大学 ， 物理学， 2011， 硕士

【摘要】 子弹侵彻陶瓷复合装甲的研究具有重要的军事应用背景和民用价值,一直受到众多学者广泛的关注,对防护工程结构设计有重要意义。本文主要以直径为12.7mm,平动速度为500m/s的平头弹和圆头弹为例,利用LS-DYNA有限元程序对子弹侵彻靶板过程中的弹靶的损伤破坏机理及物理过程进行了研究。主要研究内容和成果如下：以3-20mm厚的钢板为基材,子弹选用Rigid、Plastic-kinematic和Johnson-cook三种本构模型对钢板抗侵彻能力模拟分析,得到钢板的极限穿透厚度分别为16mm、6.3mm、6.8mm,选Johnson-cook本构模型作为子弹后续试验模型；选用平头弹和圆头弹侵彻不同厚度钢板进行模拟分析,得到平头弹侵彻钢板的极限穿透厚度为6.8mm,圆头弹侵彻钢板的极限穿透厚度为7.5mm,平头弹的破坏区域较大,圆头弹有较强的侵彻能力。分析探讨B4C陶瓷／钢板复合靶板的防护能力与靶板结构设计之间的关系,得知B4C陶瓷做面板复合靶有较优的抗弹性能。B4C陶瓷/钢板复合靶层间界面的法向失效应力为43MPa,剪切失效应力25MPa时,子弹的剩余速度为22m/s；层问界面的法向失效应力为86MPa,剪切失效应力30MPa时,子弹的剩余速度为0m/s,得知提高靶板间界面强度可提高陶瓷复合靶抗弹性能。对约束状态下的B4C陶瓷复合靶板结构进行模拟研究。5mm厚B4C陶瓷做面板,背板分别取1-9mm厚的钢板、铝板和纤维板进行约束,得到钢板、铝板、纤维板的最优厚度比分别是6mm,6mm,4mm；纤维板做背板能够发挥较好的支撑作用。B4C(5mm)/钢板(3mm)复合靶中陶瓷面板侧向约束时,陶瓷锥的基本形成时间是6.4μs；陶瓷非侧向约束时,陶瓷锥的基本形成时间是6.6μs,得知陶瓷侧向约束提高复合靶抗弹性能；纤维板做盖板B4C陶瓷复合靶板有较优的抗弹性能。本文的研究结果为陶瓷复合靶结构设计提供了一定的参考价值。更多还原

【Abstract】 The research of bullet penetration ceramic composite targets has great significance both in military and engineering, and so that it always attracts the attention of scholars at home and abroad. It has important meaning for the structure design of the protective engineering.In this paper, finite element analysis software LS-DYNA was used to study the damage and its physical process of projectile and target during the process of impact projectile invading into armored materials which based on flat bombs and round shells of diameter 12.7mm and translational velocity 500m/s. The main research content and the achievement of this paper is as follows:Take 3-20mm thick steel plate as the basic material, Rigid, Plastic-kinematic and Johnson-cook material model was employed to simulation for Anti-penetration ability of the steel plate, Limit penetration by plate thickness are 16mm,6.3mm,6.8mm, Johnson-cook material model selected as the bullets follow-up test model; Flat bombs and round shells was employed to simulation for Anti-penetration ability of the steel plate of different thickness, penetrated by flat bombs, steel limit thickness is 6.8mm, penetrated by round shells, steel limit thickness is 7.5mm, flat bombs which destroyed large areas, round shells with strong penetration ability.Analysis the relationship between the structural design of the target plate with the protective capacity of the B4C Ceramic/metal composite plate, the simulation results show that, B4C ceramic to compound target’s panel have good anti-ballistic properties. B4C ceramic/steel composite target layer interface normal stress failure of 43MPa, Shear failure stress of 25MPa, residual velocity of bullet is 22m/s; Interface normal stress failure of 86MPa, shear failure stress of 30MPa, residual velocity of bullet is Om/s, enhance interfacial strength can improve ceramic composite targets anti-penetration performance.Several kinds of B4C ceramic composite targets were simulated. B4C ceramic of 5mm thick to compound target’s panel, back to take steel, aluminum and fiber board of 1-9mm thick to constrain, steel, aluminum, fiber board optimal thickness ratio are 6mm,6mm,4mm, fire backboard can play better supporting role. The confined B4C(5mm)/steel(3mm) ceramic composite targets, the basic form of ceramic cone time is 6.4μs; unconfined B4C ceramic targets, the basic form of ceramic cone time is 6.6μ.s, the confined ceramic composite targets have excellent protection ability compared to unconfined B4C ceramic targets to projectiles penetration; cover plates made of fibre has excellent anti-penetration performance under projectile impact.The results of this paper give reference to structural design of B4C ceramics compound target.更多还原