静力试验中C/SiC构件集成式热结构的声发射特性及与材料测试的对比学术资讯

《复合材料学报》优先在线发表论文。

摘要：在对C/SiC复合材料常温拉伸试验的损伤表征和声发射演化特性进行简要分析的基础上，本文针对构件集成式设计带来的复杂性特点，对某C/SiC热结构在常温静力试验中的声发射特性进行了分析。给出了试验中声发射特征参数的分类特点。根据试验加载中声发射信号规律，给出了结构的损伤演化模式。通过与材料级声发射信号的对比，判断了试验加载与热结构极限破坏载荷之间的裕度。由此将声发射测试从材料级别的研究延伸到大型C/SiC热结构。

关键词：C/SiC复合材料；热结构；声发射；损伤模式；模式识别

Abstract: Based on the simply analysis of damage mechanism for C/SiC composites and its performance evolution of acoustic emission(AE) during tensile test at room temperature，an analytical research on the AE characterization for one C/SiC thermal structure during static strength experiment at room temperature has been conducted in this paper, aimed at the complex characteristics caused by the component assembly design for it. The sort characters of AE parameter were given. The damage evolution patterns were given according to the AE regulation during experimental loading. By the comparison with AE parameter of C/SiC composites, the remaining value was judged between experimental loading to the ultimate damage loading for the thermal structure. So, the AE measure was extended to large C/SiC thermal structure from the research at material level.

Keywords: C/SiC composites; thermal structure; acoustic emission; damage mode; pattern recognition

作者：谭志勇等，空间物理重点实验室，北京

通讯作者：谭志勇，空间物理重点实验室，北京

全文详见中国知网学术期刊优先数字出版。