弾性の逆演算処理によるシェブロンノッチ付等方性カーボンの安定亀裂のマイクロダイナミックス

概要

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Microdynamics of chevron-notched isotropic carbon were investigated by the source inversion processing of elastic waves. The geometric correction factor for stress intensity factor Y determined by compliance measurement was found to agree well with that or the superpose method by D. Munz. The fracture toughness of this material was 1.3MPa・m^<1/2>. The AE monitoring system (ADAS) developed by the authors was demonstrated to measure the surface displacement generated by mode-I cracking. Therefore, the source waves, crack volume and released energy were obtained by the time-domain deconvolution integral of detected displacement by the theoretical Green's function of the media. The area produced by stable crack propagation was found to be about 0.5-1.0mm^2, and to agree fairly well with the characteristic features of the fracture surface. The stable crack growth velocity was estimated to be about 250m/s.
1991-10-25