陶瓷材料生产和服役中难以避免会受到热和外力作共同作用而产生应力集中和裂纹萌生/扩展等损伤，最终使得材料及部件性能下降、失效和破裂，热-力载荷下材料体应力状态分析和裂纹演化机制也成为核陶瓷材料研发和服役中迫切需要解决的问题之一，适用于陶瓷材料的热-力载荷下体应力/裂纹的无损测量方法研究是陶瓷材料表征研究的前沿课题和难点。本项目拟针对氢化锂和氧化镁等粉末冶金陶瓷材料，发展可适用陶瓷材料的热-力载荷下裂纹扩展原位观察和全场应变/应力测量的DIC测量方法，结合弹性力学理论和有限元数值模拟，建立陶瓷材料热-力载荷下体应力表征方法以研究体应力及裂纹的演化机制，分析温度和力载荷大小/类型对陶瓷材料应力状态和裂纹萌生/扩展速率的影响，研究陶瓷材料残余应力产生机理及对裂纹萌生/扩展的影响，探索改善热-力载荷下陶瓷材料部件应力状态以减少裂纹萌生和阻止扩展的方法，为陶瓷材料研发和应用提供实验依据和理论指导。

The ceramic materials will be subject to the effect of heat and external force under fabrication and service process. The damage of ceramic materials such as stress concentration, crack propagation and etc. caused by heat-force loading may eventually results in performance degradation, failure and rupture of materials and component. The body stress state analysis and crack evolution mechanisms in the ceramic materials under heat-force loading have become one of the urgent problems to be solved in the research and development of nuclear ceramic materials. At present, there is no nondestructive and non-contact measurement method for body stress and micro crack measurement for ceramic material under heat-force loading, which is a key issue in the research of ceramic characterization. This project proposes to establish the body stress characterization method for ceramic materials, based on the in-situ observation method of crack propagation and DIC measurement of total field strain/stress, which is combined finite element method. The method will be applied to measure the body stress and evolution of crack propagation for lithium hydride and magnesium oxide under heat-force loading. Effect of temperature and loading on stress state evolution and initiation and propagation rate of crack will be analyzed. Performance and lifetime under different temperature loading will be also explored. All results will be contributed to provide experiment basis and theoretical guideline to the fabrication and service of nuclear ceramic materials.