冲击波-破片联合载荷对固支方板的耦合作用机理  

Mechanism of Coupling Effect of Shock Wave and Fragments on Clamped Square Plate

作　　者：周猛 梁民族[1] 林玉亮[1] ZHOU Meng;LIANG Minzu;LIN Yuliang(College of Science,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学理学院,湖南长沙410073

出　　处：《兵工学报》2023年第S01期99-106,共8页Acta Armamentarii

基　　金：国家自然科学基金项目(12272410)。

摘　　要：针对冲击波-破片联合载荷的耦合特性,开展了冲击波和破片对固支方板的联合作用效果研究。采用经试验结果验证的有限元模型分析了炸药驱动预制破片的飞散过程,讨论了不同载荷类型下靶板的变形和失效模式,阐释了冲击波和破片载荷耦合作用的毁伤机制。研究结果表明:在爆炸场近区,冲击波和破片无论哪种载荷先到达靶板,只要二者到达间隔小于靶板响应时间,载荷之间都存在耦合毁伤效应;冲击波和破片单独作用下靶板的主要变形失效模式分别为挠曲变形和剪切穿孔,冲击波作用下破片穿孔处易发生起裂、破孔贯穿;耦合作用下冲击波和破片对靶板的作用机制与单一载荷不同,一方面侵彻穿孔降低了靶板强度使冲击波作用下靶板产生的挠度增大,另一方面冲击波产生的挠度变化使得侵彻作用时刻推迟、侵彻时间增长、破片传递给靶板的能量更多;相比于冲击波和破片单独作用的简单叠加,耦合作用下靶板的残余挠度增加了19.2%。The coupling effect of shock wave and fragments on a clamped square plate is studied based on their coupling characteristics.The dispersion mechanism of prefabricated fragments propelled by explosives is investigated using a validated finite element model,and the findings are supported by experimental evidence.The deformation and failure modes of a target plate under various loads are discussed,and the damage mechanism resulting from the coupling effect of shock wave and fragment loading is elucidated.The results demonstrate that a coupling damage effect occurs in the vicinity of explosion field when the arrival interval between the two loads is less than the response time of target plate,regardless of the order in which the loads reach the plate.The primary deformation failure modes of target plate are flexural deformation and shear perforation caused by the shock wave and fragments,respectively.Moreover,theperforation of fragments under the action of shock wave is prone to cracking and hole penetration.The study also reveals that the mechanism of shock wave and fragment interaction differs from that of individual load.The strengthof target plate is reduced and its deflection is increased under the action of shock wave,leading to penetration perforation.Furthermore,the deflection induced by the shock wave delays the penetration time,extends the perforation period,and transfers more energy to the target plate.The residual deflection of target plateunder the coupling effectjs increased by 19.2%compared to the simple superposition of the shock wave and fragment loads.

关 键 词：爆炸冲击波 破片 耦合作用 动态响应 

分 类 号：O383.3[理学—流体力学]