Acoustic emission characteristics of 2D-C/SiC ceramic matrix composites under tensile test
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摘要: 对2D-C/SiC陶瓷基复合材料试样在室温条件下单调拉伸试验和循环拉伸试验的损伤声发射信号进行研究，利用无监督层次聚类分析方法对单调和循环拉伸试验的声发射信号进行损伤模式识别，得出了两种拉伸试验下试样都有相同的损伤分类。对每次单调加/卸载试验分别进行应力和声发射信号分析，得到了在循环加载区间和卸载区间试样的损伤情况。对比分析两种拉伸试验的声发射信号，得到两次试验中首次加载相同应力时，两个试样有同一种类的声发射损伤信号，从而说明循环加载对试样的主要损伤影响较小。Abstract: Acoustic Emission (AE) signals of 2D-C/SiC ceramic matrix composites under monotonic tensile test and cyclic tensile test at room temperature were studied. The unsupervised hierarchical clustering method was used to identify the damage pattern of AE signals in monotonic and cyclic tensile tests. The stress and acoustic emission signals of each monotonic loading/unloading test were analyzed respectively, and the damage conditions of the samples in the cyclic loading interval and the unloading interval were obtained. By comparing and analyzing the AE signals of the two tensile tests, it is found that when the same stress is first loaded in two tests, the two samples have the same type of AE damage signals, which indicates that the repeated loading has little impact on the main damage of the samples.
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