ABSTRACT
So there will be two waves propagating in media, one is longitudinal wave (compression wave) and another is transverse wave (shear wave). As the waves propagate in the materials, part of them will transmit to the surface of test specimen, forming the acoustic emission signals, which can be detected by the AE sensors. Technical advances make more and more scholars use acoustic emission method to study the materials failing process and obtain valuable conclusions. Lavrov and Shkuratnik (2005) obtained the relationship in deformation-and fracture-induced with acoustic emission in rocks. Jiang et al. (2009) studied the acoustic emission characteristics during rock fatigue damage and failure. Erarslan and Williams (2012) researched failure in quasi-brittle materials with acoustic emission method. Guo et al (2012) researched on the rock’s acoustic emission and damage deformation characteristics in uniaxial compression condition.
