Abstract
To apply the AE techniques to the structural integrity monitor in many industrial areas, it is necessary to get a good understanding on the AE behavior of the structural materials and to accumulate basic reference data related to various modes of failure. The AE behavior is strongly affected by both the material inherent nature and the external conditions such as stress, temperature and the surrounding atmosphere. AE event‐rate and peak‐amplitude‐distribution characteristics, which are the best indicators of the AE activities for first arrival signals entered into a selected transducer, are summarized in the process of uniaxial tension and/or compression loading for various industrial materials of steels, nonferrous metals, and nonmetals. The changes of the AE activities are also presented from the sound state to the degraded state followed by neutron irradiation, strain‐aging, thermal degradation, corrosion, fatigue, etc.
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