AE波形の逆たたみ込み積分による微視割れモーメントテンソルの導出

概要

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An advanced acoustic emission technique was developed to obtain a moment tensor due to microcracking, that allows evaluation of the fracture mode, size and nucleation rate of microcracks. At first, the theory of acoustic emission source characterization was presented by the `eigenstrain method' of micromechanics. This moment tensor can be evaluated by time domain deconvolution of the detected signals, using the transfer function of the measuring system and the dynamic Green's function of the medium. The transfer function of the measuring system can be estimated by means of a simulated signal, while the dynamic Green's function was estimated by computer simulation using the finite difference method. In the case of Si_3N_4 microcracks were located at the front of precrak, and the size estimated was compared with the direct observation in the scanning electron microscope.
社団法人日本機械学会の論文
1988-12-25