基于数字图像相关方法的SiCf/SiC陶瓷基复合材料力学行为表征

Progress in characterization of mechanical behavior of SiCf/SiC ceramic matrix composites based on digital image correlation

SiCf/SiC陶瓷基复合材料具有低密度、耐高温、高比强度等优异特性,是新一代先进航空发动机热端部件的理想材料。为实现SiCf/SiC复合材料在服役环境下的可靠应用,亟须开展复合材料力学行为表征研究。与引伸计、应变片等其他测试方法相比,数字图像相关方法(digital image correlation,DIC)具有非接触式、全场测量和可操作性强等优点,能够实现对复杂耦合环境下复合材料损伤断裂等力学行为的原位表征,因而受到广泛关注。本文系统梳理和总结DIC在SiCf/SiC复合材料室温拉伸、弯曲、爆破等力学测试中的应用进展,介绍DIC在SiCf/SiC复合材料力学加载过程的高温测量,最后对应用于SiCf/SiC复合材料的DIC表征技术进行了总结及展望。

SiCf/SiC ceramic matrix composites are the ideal materials for high-temperature components of a new generation of advanced aero-engine with their excellent properties,such as low density,high temperature resistance,high specific strength.In order to realize the reliable application of SiCf/SiC composites in service environment,it is urgent to carry out the characterization research on mechanical behavior of the composites.Compared with other testing methods,such as extensometers and strain gauges,digital image correlation(DIC)has the advantages of non-contact,full-field measurement and strong operability.It can realize in-situ characterization of mechanical behaviors such as damage and fracture of composite materials in complex coupling environments,which has received extensive attention.In this paper,the application progress of DIC in tensile,bending,blasting and other mechanical tests of SiCf/SiC composites at room temperature are systematically reviewed and summarized.And the progress of high-temperature measurement via DIC in mechanical loading process of SiCf/SiC composites is introduced in detail.Finally,the DIC characterization technology of SiCf/SiC composites is summarized and prospected,which provides a basis for performance optimization and engineering application of SiCf/SiC composites.