温度与冲击协同作用对PZT的力电响应影响机理研究

针对高过载下弹载引信用压电陶瓷（PZT）断裂后的力电响应以及温度载荷诱发PZT的异常放电行为等多物理场耦合的基础科学问题。本项目拟以典型“软质”压电陶瓷（PZT-5H）为研究对象，采用实验、理论分析和仿真相结合的方法，系统研究冲击载荷下PZT的放电特性和断裂放电行为、温度对PZT基本物理性能参数的影响以及温度与冲击协同作用对PZT的力电响应影响，摸清不同应力下裂纹产生、扩展过程及负载（电阻、电容和电感）对PZT放电性能的影响，阐明温度环境、温度刺激对PZT性能参数及断裂强度的影响规律；结合裂纹的形成过程和微观分析，澄清PZT断裂过程与放电行为的关联，分别建立断裂后PZT再次遭遇冲击诱发放电的力电耦合模型；温度环境（或温度刺激）、应力脉冲及电学边界条件（开路和短路）与压电系数、放电电压的关联模型，揭示温度与冲击协同作用对PZT的力电响应影响机理，为PZT在弹载引信中的可靠应用奠定坚实的基础。

Aiming at the basic scientific problems of multi physical field coupling, such as the mechanical and electrical response of piezoelectric ceramics (PZT) used in missile borne fuze after fracture under high overload and the abnormal discharge behavior of PZT induced by temperature load. In this project, the typical "soft" piezoelectric ceramics (PZT-5H) are taken as the research object, and the methods of experimental research, theoretical analysis and numerical simulation are used to systematically study the nonlinear discharge characteristics and fracture discharge behavior of PZT under impact, the influence of temperature on the basic physical performance parameters of PZT, and the influence of temperature and impact on the electromechanical response of PZT under the synergistic interaction. The influence of the crack generation, propagation process and load (resistance, capacitance and inductance) on the discharge performance of PZT, and the influence rules of temperature environment and temperature stimulation on the performance parameters and fracture strength of PZT will be clarified; the relationship between the fracture process and discharge behavior of PZT will also be clarified by combining the formation process with micro analysis of cracks, and the mechanical electrical coupling model of the discharge of PZT induced by shock after fracture, and the correlated models among the temperature environment (or temperature stimulation, stress pulse and electrical boundary conditions (open-circuit and short-circuit) with piezoelectric coefficient and discharge voltage will be established, respectively. Finally, the influence mechanism of temperature and shock synergism on the electro-mechanical response of PZT will be revealed, which will lay a solid foundation for the reliable application of PZT in missile borne fuze.