Topic
Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
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TL;DR: In this article, acoustic emission was used to study the development of pitting corrosion on AISI 316L austenitic stainless steel, in a 3% NaCl solution acidified to pH 2.
124 citations
TL;DR: These results do not compare well with fracture models, for (brittle) disordered media, which as such exhibit criticality, and one reason may be residual stresses, neglected in most theories.
Abstract: We report tensile failure experiments on paper sheets The acoustic emission energy and the waiting times between acoustic events follow power-law distributions This remains true while the strain rate is varied by more than 2 orders of magnitude The energy statistics has the exponent beta approximately 125+/-010 and the waiting times the exponent tau approximately 10+/-01, in particular, for the energy roughly independent of the strain rate These results do not compare well with fracture models, for (brittle) disordered media, which as such exhibit criticality One reason may be residual stresses, neglected in most theories
124 citations
Journal Article•
TL;DR: In this paper, wavelet transform was applied to acoustic emission (AE) signals from a longitudinal glass-fiber reinforced composite sample under tensile loading and the obtained spectrograms were classified into four types and correlated to the fracture dynamics separately determined by radiation pattern and source simulation analyses.
Abstract: Wavelet transform (WT) allows the determination of frequency spectrum as a function of time using short waveform segments or wavelets as the basis functions. Resultant mapping of wavelet coefficients in the frequency-time coordinate plane provides more informative characterization of acoustic emission (AE) signals than the power-density spectra from usual Fourier transform. A short tutorial on WT is included. A program for performing WT procedure has been developed and is given as Appendix. As an example, wavelet transform was performed on AE signals from a longitudinal glass-fiber reinforced composite sample under tensile loading. Obtained spectrograms were classified into four types and correlated to the fracture dynamics separately determined by radiation pattern and source simulation analyses. WT is demonstrated to be a powerful new analysis method in evaluating AE signals.
123 citations
TL;DR: In this article, an acoustic emission (AE) study performed during laboratory tests of concrete slab specimens strengthened with carbon fiber reinforced polymer (CFRP) strips is demonstrated, and an algorithm to classify the cracks in concrete, the disbond of the CFRP strips from the soffit of the slab, and the eventual failure (debonding or concrete shear).
122 citations
TL;DR: In this paper, the application of acoustic emission to the detection of fatigue-crack propagation in 7075-T6 aluminum and 4140 steel is investigated, and the relationship between crack-growth rate, cyclic stress-intensity factor, load-cycling rate and observed acoustic-emission behavior is presented.
Abstract: The application of acoustic emission to the detection of fatigue-crack propagation in 7075-T6 aluminum and 4140 steel is investigated. The relationship between crack-growth rate, cyclic stress-intensity factor, load-cycling rate and observed acoustic-emission behavior is presented. Crack-growth rates of less than 10−6 in./ cycle could be detected, and acoustic-emission counts per cycle were shown to be closely related to the energy released by crack extension per cycle. A quantitative relationship for the threshold conditions for detection of fatigue-crack growth is presented which agrees with experimental test results. The results also showed that fatigue-crack growth occurs in an accelerating and decelerating manner, even though the stress-intensity range remains uniform, and that the count rate posses through a peak that is believed to be associated with a plane strain-plane stress transition. The effects of instrumentation sensitivity and frequency bandpass are also investigated. The results obtained indicate that acoustic-emission techniques should be suitable for in-service monitoring of a variety of cyclically loaded structures, even in the presence of high background noises.
122 citations