冲击加载下含孔隙PZT铁电陶瓷的动态本构响应与失效研究

项目名称： 冲击加载下含孔隙PZT铁电陶瓷的动态本构响应与失效研究

项目编号： No.11272164

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 王永刚

作者单位： 宁波大学

项目金额： 82万元

中文摘要： PZT铁电陶瓷以其优异的力电耦合效应现已成为重要的先进功能材料。在制造和使用过程中，铁电陶瓷制器件不可避免地承受各种静态/动态载荷因而有可能发生力学失效或介电击穿。弄清楚PZT铁电陶瓷动态本构响应与失效的物理力学机制是十分必要的。本项目拟在高应变率单轴压缩、动态三点弯曲以及平板撞击加载下，较系统地研究不同加载应变率和不同三轴应力状态下含孔隙PZT铁电陶瓷材料的动态本构响应、微裂纹损伤演化与失效行为，重点揭示孔隙微结构对PZT铁电陶瓷动态本构响应与失效的影响规律与物理机制，获得含孔隙PZT铁电陶瓷的宏观力学参数以及失效机理方面的深刻认识，阐明孔隙微结构与微裂纹传播之间相互作用的物理机制，构建PZT铁电陶瓷宏细观相结合的非线性动态本构关系及微裂纹型损伤演化与失效模型，探索提高PZT铁电陶瓷韧性和抗冲击性能的有效途径，从而为研制高性能、高可靠性的PZT铁电陶瓷器件提供必要的技术指导和基础理论。

中文关键词： 铁电陶瓷；畴变；相变；孔隙率；力学行为

英文摘要： PZT ferroelectrics ceramics have become an advanced functional material because of their superior electromechanical characterization.Nonetheless,dielectric or/and mechanical breakdown of PZT ceramics often happen under static/dynamic loading during the process of manufacture and application. It is urgent demand to study the dynamic mechanical constitutive behavior and failure mechanism in PZT ceraimics.In our project,the dynamic mechanical properties,crack damage evolution and failure of PZT ceramics with pore will be investigated under high strain rate uniaxial compression, dynamic three points bending and gas gun plane impact.The parameters of mechancial response and the understanding of failure mechanism of PZT ceramics under different dynamic loading will be achieved. It will be paid more efforts to explore the influence of pore on the dynamic constitutive behavior and failure of PZT ceramics and the interaction physical mechanism between pore and crack propagation.A macroscopic-microscopic dynamic constitutive model and crack damage evoltuion failure model will be proposed.Finally,we try our best to seek the effective technique to improve the ductility and impact tolerance capability of PZT ceramics. These research will provide some insight and theory foundation for the design of PZT ceramic devices with h

英文关键词： ferroelectric ceramics；domain switching；phase transformation；porosity；mechanical behavior