Abstract
The application of acoustic emission to industrial ndt is hindered by a lack of exact knowledge of the significance of parameters such as total count, to characterize the emissions. These parameters, and any novel parameters which can be derived, must be critically re-examined for their relation to metallurgical, mechanical and geometrical characteristics of structures if progress is to be achieved. The author describes experimental and theoretical work to this end on emissions from plastic deformation and fracture of various test pieces. The author concludes from his findings that the problems of noise and transducer sensitivity seem to be surmountable.
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