Abstract
A quantitative information on kinematics of cracking mechanisms can be obtained from the moment tensor analysis of acoustic emission (AE). According to the SiGMA (Simplified Green's functions for Moment tensor Analysis) procedure, crack orientation and crack types are determined. Based on the theory of linear elastic fracture mechanics (LEFM), crack extension under mixed mode fracture is determined by the maximum circumferential stress criterion. A relation between the direction of crack determined from the moment tensor components and the stress intensity factors is studied and applied to estimate the normalized stress intensity factors, KI and KII* in cementitious materials.
