Abstract
Acoustic emissions from the vicinities of cracks were monitored by a multichannel acoustic emission system, The experiment was performed on a flawed carbon steel vessel under hydraulic pressure providing a nearly uniform external stress in the vessel wall, However, the stress fields near the cracks were nonuniform. The numbers of acoustic wave packets generated from the individual cracked regions were analyzed by an on-line minicomputer, The correlation between the number of the wave packets and the size of crack at low stress levels was found experimentally and is consistent with a theory of non-uniformly distributed moving dislocations in the vicinity of crack, Further calculations by utilizing the theory and by analyzing available experimental data of acoustic emissions from other types of flawed specimens of various crack sizes also show agreement between the theory and the experimental data.
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