Understanding Acoustic Emission Testing- Reading 1 Part B-A

16.7.3 Fracture Process Zone (Crack Source) Location
Perhaps the greatest current interest in acoustic emission analysis is its use
in locating fracture processes, and in monitoring the damage that concrete
undergoes as cracks progress. Okada et al. showed that the location of crack
sources obtained from differences in the arrival times of acoustic emissions
was in good agreement with the observed fracture surface. At about the same
time, Chhuy et al. and Lenain and Bunsell were able to determine the length
of the damaged zone ahead of the tip of a propagating crack using onedimensional
acoustic emission location techniques. In subsequent work,
Chhuy et al., using more elaborate equipment and analytical techniques,
were able to determine damage both before the initiation of a visible crack
and after subsequent crack extension. Berthelot and Robert and Rossi used
acoustic emission to monitor concrete damage as well.
Charlie Chong/ Fion Zhang