Standard Practice for Acoustic Emission Monitoring of Structures During Controlled Stimulation
NORMA vydaná dňa 15.1.2020
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Designation standards: ASTM E569/E569M-20
Publication date standards: 15.1.2020
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Kategória: Technické normy ASTM
This practice provides guidelines for acoustic emission (AE) examination or monitoring of structures, such as pressure vessels, piping systems, or other structures that can be stressed by mechanical or thermal means. The basic functions of an AE monitoring system are to detect, locate, and classify emission sources. Other methods of nondestructive testing (NDT) may be used to further evaluate the significance of acoustic emission sources. Acoustic emission examination of a structure usually requires application of a mechanical or thermal stimulus. Such stimulation produces changes in the stresses in the structure. During stimulation of a structure, AE from discontinuities (such as cracks and inclusions) and from other areas of stress concentration, or from other acoustic sources (such as leaks, loose parts, and structural motion) can be detected by an instrumentation system, using sensors which, when stimulated by stress waves, generate electrical signals. Annual calibration and verification of pressure transducer, AE sensors, preamplifiers, signal processor, and AE electronic waveform generator should be performed.
Keywords:
active source, clustering, controlled stimulation, critically active source, critically intense source, intense source, leaks, loose parts, mechanical stress, pressure vessel, source classification, source location, thermal stress,, ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)