A Study on the Micro-Crack Development of KURT Granite Using Acoustic Emission Technique

In this study, moment tensor analysis in acoustic emission (AE) was adopted to analyze the tensile failure mechanism of granite under three point bending load. Source location result was in remarkable agreement with the real failure plane. However, it was showed that although the tensile failure was initiated by the tensile cracks generated from the tip of V shape notch, the failure was mainly caused by shear cracks occurred along the failure boundary. This is considered due to the irregular arrangement of mineral rock. Therefore despite the fact tensile stress was applied to the specimen, tensile and shear cracks were well distributed. In addi-tion, shear cracks interacted with existing neighboring cracks and when the failure occurred, the cumulative volume reache