Crack Opening Volume Research Articles

Characterization of Cracks From Ultrasonic Scattering Data

An inverse method for ultrasonic scattering data is proposed, to characterize a planar crack of general shape contained in an elastic solid. The method is based on an integral representation for the scattered field in the frequency domain. For a given scattered field the inverse problem has been formulated as a nonlinear optimization problem. At low frequencies its solution gives the location of the crack, the orientation of the crack-plane, and the crack-opening volumes. In addition the Mode I stress-intensity factor is obtained for a related static stress state corresponding to service loads.

Characterization of microcracks in YCrO3 using small-angle neutron scattering and elasticity measurements

The mean crack radius, crack opening displacement, number density, and volume fraction have been estimated for a population of microcracks in polyerystalline YCrO3 using small-angle neutron scattering in tandem with elasticity measurements.

Acoustic emission due to nucleation of a microcrack in the proximity of a macrocrack

Acoustic emission generated by the nucleation of a microcrack in the proximity of a macrocrack is discussed in this paper. On the basis of some simple approximations the acoustic emission from a crack-opening event is directly related to its crack-opening volume as a function of time. It is shown that the nucleation of a microcrack in the immediate vicinity of a macrocrack generates additional crack-opening volumes for both the macrocrack and the microcrack, whose signals tend to be much larger than those that would emanate from a nucleating solitary microcrack.