Micromechanisms of fracture from acoustic emission

Acoustic emission (AE) events were located and characterized from a mode I fracture test on Charcoal granite. An AE source was modeled as a displacement discontinuity, a microcrack, with a displacement vector b, normal n, and area ΔA. For convenience, the source parameters were recovered through a moment tensor representation, the components of which were estimated by minimizing the error between theoretical and measured displacements at sensor...