C/SiC复合材料高温蠕变的声发射特性

Acoustic Emission Characteristic of C/SiC Composite During Creep at High Temperature

摘要: 利用声发射技术(AE)对C/SiC复合材料高温蠕变试验过程进行动态监测。通过声发射参数分析法对蠕变过程中的声发射累计能量随蠕变时间变化进行了分析；同时对蠕变过程中典型AE信号的频率特征进行了分析，揭示了C/SiC复合材料蠕变损伤的演化过程及规律，给出了材料蠕变损伤发展的不同阶段以及各阶段损伤类型。

Abstract: Acoustic emission(AE) was used to inspect the creep test at high temperature in real time. A parameter-analyzing approach was introduced to analyze energy, different damage phases and types of damage by AE data. The spectrum of typical AE signals was analyzed to reveal the damage evolution of C/SiC composite during creep. The mechanism in different stages of damage evolution was also differentiated.