Acoustic emission source characterization in materials

被引:6
作者
Enoki, M [1 ]
Kishi, T [1 ]
机构
[1] Univ Tokyo, Dept Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan
来源
ACOUSTIC EMISSION - BEYOND THE MILLENNIUM | 2000年
关键词
acoustic emission; source characterization; location; deconvolution; moment tensor; microcrack; laser interferometer;
D O I
10.1016/B978-008043851-1/50001-7
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Acoustic emission (AE) source characterization has been developed to understand the dynamic process of microfracture in metals, ceramics and composites. The development of AE source characterization is summarized and some examples of analysis are described. Firstly, AE waveforms from glass matrix composites during fracture toughness test were recorded by using the advanced AE measuring system with multi-channels. The source model of microcracking and the deconvolution method also could evaluate fracture mode and microfracture size. Secondly, the algorithm of a three dimensional AE source location for anisotropic materials was developed to investigate the crack propagation of glass fiber reinforced plastic thick plate which has variable wave velocities along different directions. The results of source location clearly demonstrated the forming of fracture process zone in the material, that is, the three dimensional shape and size of process zone could be estimated. Finally, the laser interferometer was used to measure AE during the thermal cycle and to evaluate fracture behavior in plasma-sprayed ceramics coatings onto steel substrate. The results showed that it is possible to use laser facility as acoustic emission measurement method. Moreover, by analyzing detected waves due to the AE source analysis, the fracture behavior of coatings during thermal cycle tests was quantitatively evaluated.
引用
收藏
页码:1 / 17
页数:17
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