非药式水下冲击波作用下夹层结构力学响应与毁伤机理研究

Underwater explosion with high peak pressure and extreme short action time is the main source of naval ships damage. However, due to the limitation of experimental skill, the anti-explosion and anti-shock performance of naval ships under underwater explosion shock is studied insufficiently. Non-explosive underwater shock experiment exhibits many advantages as a new lab-scale research method of underwater explosion, including controllable explosion shock pressure (0-200 MPa), high reliability, precise measurement data, low cost, high repeat rate, and so on. In this study, by using the non-explosive underwater explosion technology， the dynamic response of three typical sandwich structures (lattice core, pyramidal core and corrugated core) under fluid-solid coupling interaction will be investigated experimentally and theoretically. The quantitative relationship will be obtained between the damage of the sandwich structure and the strength of underwater explosion shock loading. The failure criterion will be obtained by analyzing the failure modes and damage mechanism of different sandwich structures under the underwater shock loading. The fluid-solid coupling interaction dynamics engineering-predication model of these structures can be proposed in terms of the damage mechanism. Furthermore, based on the energy-absorption characteristics of different sandwich structures, the relationship between the strength of shock loading and the protective capability of sandwich structures will be obtained. 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.

水下爆炸冲击波载荷的峰值压力大，作用时间短，是舰艇结构水下爆炸毁伤效 应的主要来源。但由于实验条件的限制，有关舰艇结构抗爆抗冲击性能问题的研究还不够充 分。非药式水下爆炸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可 控（0～200MPa）、可靠性高、数据测量精确、低成本、重复率高等优点。本项目利用非药式水下爆炸冲击波加载技术，对三种典型夹层结构板（格栅型、波浪型和金字塔型）在流固耦合作用下的变形毁伤效应进行系统的实验和理论分析，给出典型夹层结构的具体失效模式，确立水下爆炸冲击波强度与夹层结构板变形毁伤之间的定量关系，建立典型夹层结构在水下冲击波载荷作用下的毁伤判据。基于不同类型夹层结构的吸能防护特性，获得典型夹层结构的吸能防护能力与外部载荷之间的定量关系，为提高舰艇生命力的工程结构设计提供理论支持和依据。

水下爆炸是舰船服役过程中的主要威胁之一，提升舰船防护结构的抗水下爆炸冲击性能，推进结构的轻量化设计是当前提升舰船机动性能和生存能力的关键技术问题。但由于实验条件的限制，有关舰艇结构抗爆抗冲击性能问题的研究还不够充分。本项目利用新型的非药式水下爆炸冲击波加载技术，对典型夹层结构板在流固耦合作用下的变形毁伤效应进行系统的实验和理论分析，给出了夹层结构的动态响应参数、失效过程在平面水下冲击波强度、结构参数等因素影响下的变化机理，并揭示结构设计参数对其失效机理的影响，得到相应的量化的关系。基于典型夹层结构受冲击载荷作用后能量吸收机理、失效模式，通过不同的结构抗水下冲击参数来评估相应结构的抗水下冲击防护性能，建立相应的预测模型。结合动态响应过程和抗冲击参数，建立准确的理论预测模型，为夹层结构在水下冲击载荷作用下的动态响应过程和最终的靶板变形提供准确的理论预测结果。本项目为进一步完善结构抗水下爆炸冲击性能的理论研究体系及舰船防护结构抗冲击性能的提升提供重要的支持和依据。