Two methods are proposed for the mapping of cracklike flaws in homogeneous, isotropic, elastic media. The methods require as input data the travel times of diffracted ultrasonic signals. The first method maps points on the crack edge by a process of triangulation with the source and receiver as given corner points of the triangle. By the use of travel times for neighboring positions of the source and/or the receiver, the direction of signal propagation, which is the necessary constitutent required to complete the triangle, can be computed. The inverse mapping is global in the sense that no a priori knowledge of the location of the crack is required. The second method is a local edge mapping which determines sets of planes relative to a known point close to the crack edge. Each plane contains a flash point. The intersection of the envelopes of two sets of planes maps an approximation to the crack edge.
ASJC Scopus subject areas
- Arts and Humanities (miscellaneous)
- Acoustics and Ultrasonics