非药式水下冲击波与高速破片耦合加载结构响应及毁伤机理研究

The attack of torpedo, mine and other underwater weapon warhead seriously threatens the vitality of naval ship. Water is dense medium and difficult to compress, the target damage suffers from underwater explosion shock wave and high-velocity fragment synergetic loading is far greater than the explosion in the air. The underwater explosion shock wave strength, fragment velocities and interaction sequence etc. fluid （supercavitaion, water)-structure (fragment, strucutre) interaction synergetic loading have very complicated effect on structure damage, there is special damage mechanism and action rule. Non-explosive simulator of underwater shock wave and high-velocity fragment synergetic loading exhibits many advantages as a new lab-scale research method, including controllable explosion shock wave pressure (0-200 MPa) and fragment velocity (0-2km/s), precise measurement data, low cost, and so on. In this study, by using the development of non-explosive underwater explosion shock wave and high-velocity fragment synergetic loading simulator，the dynamic response，damage effect and failure mechanism of structures under synergetic loading and fluid-structure coupling interaction will be investigated experimentally，simulation and theoretically. The quantitative relationship will be analyzed among the damage of the structure and the strength of underwater explosion shock wave and high-velocity fragment synergetic loading and sequence. The failure modes and failure criterion will be obtained by analyzing the damage mechanism of structures under the underwater synergetic loading. The work in this study is very valuable and beneficial to provide theory support and the scientific basis for engineering structure design of naval ships.

鱼雷、水雷等水下兵器严重威胁舰艇的生命力。水为密实介质难于压缩，水下爆炸冲击波和高速破片共同作用毁伤目标的破坏威力远远大于空气中爆炸。水下爆炸冲击波强度、破片速度和作用时序等流体（超空泡、水）与固体（破片、结构）相互耦合作用对结构毁伤的影响是非常复杂的，存在特殊的破坏机理和作用规律。非药式水下爆炸冲击波和高速破片耦合加载模拟器作为实验室范围内研究水下爆炸的一种新方法，具有爆炸冲击波压力（0～200MPa）和破片速度（0～2km/s）可控、数据测量精确、低成本等优点。本项目拟研制水下爆炸耦合加载模拟器，对结构在耦合加载和流固耦合作用下的动态响应、毁伤效应和失效机理进行系统的实验、仿真和理论分析，给出结构的失效模式，确立水下爆炸冲击波强度和破片速度及作用时序对结构变形毁伤之间的定量关系，建立典型结构在水下冲击波和破片载荷作用下的毁伤判据，为提高舰艇生命力的工程结构设计提供理论支持和依据。

水下爆炸冲击波和高速破片共同作用毁伤目标的破坏威力远远大于空气中爆炸。水下爆炸冲击波强度、破片速度和作用时序等流体（超空泡、水）与固体（破片、结构）相互耦合作用对结构毁伤的影响是非常复杂的。本项目开展了静态压力加载，细致研究了含有缺陷裂纹板的剩余抗弯防御性能和裂纹板的弯曲变形及裂纹扩展响应特性；开展了冲击波对预制裂纹板动态加载实验，可以研究含缺陷的裂纹板的冲击响应和失效特征。研制了非药式水下爆炸冲击波和高速破片耦合加载模拟器，并对结构在水下爆炸冲击波和高速破片耦合加载流固耦合作用下的动态响应、毁伤效应和失效机理进行了系统的实验、仿真和理论分析，给出了结构的失效模式，确立了水下爆炸冲击波强度和破片速度及作用时序对结构变形毁伤之间的定量关系，建立了典型结构在水下冲击波和破片载荷作用下的毁伤判据，为提高舰艇生命力的工程结构设计提供了理论支持和依据。