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 paper, fracture experiments on cementitious specimens are conducted, where the fracture mode is controlled by modifying the experiment geometry and the process is monitored by acoustic emission, and the distinct signature of the cracking modes is reflected on acoustic waveform parameters like the amplitude, RA-value and frequency.
165 citations
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TL;DR: In this article, the modal acoustic emission (MAE) technique is used to analyze the acoustic emission waveforms obtained during tensile and bending testing of CFRP laminates.
Abstract: As a result of its continuous and in situ detection capabilities, the acoustic emission (AE) technique is the prime candidate for damage monitoring in loaded composite structures. None of the AE analysis techniques used in laboratory studies has, however, proven to be capable of consistently dealing with the difficulties encountered in larger structures: large amount of data, the elimination of noise sources and the influence of wave propagation effects (attenuation, dispersion). This work will use the modal acoustic emission (MAE) technique as a more intelligent and efficient way of analysing AE results. AE waveforms obtained during tensile and bending testing of CFRP laminates will be presented. It will be demonstrated how taking into account the modal nature of AE waves can in future lead to more quantitative and accurate results.
165 citations
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TL;DR: A comprehensive review of areas where acoustic emission has been used for materials studies on composite materials can be found in this article, where the authors emphasize the roles that acoustic emission can play as a tool for the materials scientist: discovery of damage mechanisms, characterization of damage progression with increasing time or stress, optimization of fabrication variables, and reduction in the number of test specimens required in various studies.
Abstract: The technique of acoustic emission has two broad applications areas. The first is nondestructive evaluation. The second is as a tool in studies or research which are not fundamentally directed towards acoustic emission. It is this second application with which we are concerned here. Acoustic emission is a very useful tool in this role because of its high sensitivity, real-time capability, volume-monitoring approach, and sensitivity to any process or mechanism which generates sound waves. This paper presents a comprehensive review of areas where acoustic emission (AE) has been used for materials studies on composite materials. The following fields, among others, will be covered: (1) time-dependent composite properties, (2) impact studies, (3) correlation of AE with stress level, (4) application to matrix cure studies, (5) relationship of AE-detected damage to other measures of damage, (6) studies of the effects of matrix material, (7) application to differences in second phase, (8) interface studies, (9) AE and dimensional stability, (10) AE applied to orientation studies, and (11) environmental effects. This review will emphasize the roles that AE can play as a tool for the materials scientist: (1) discovery of damage mechanisms, (2) characterization of damage progression with increasing time or stress, (3) optimization of fabrication variables, and (4) reduction in the numbers of test specimens required in various studies.
165 citations
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TL;DR: In this paper, the authors investigated the mechanisms effectively responsible for the enhancement of the work-hardening capabilities of multiphase steels assisted by transformation-induced plasticity and revealed that the acoustic emission generated during tensile straining was mainly due to dislocation motion, especially from the motion of the additional dislocation density generated in intercritical ferrite by the strain induced martensitic transformation.
Abstract: The mechanisms effectively responsible for the enhancement of the work-hardening capabilities of multiphase steels assisted by transformation-induced plasticity are highlighted. Different microstructures, some containing a proportion of retained austenite with various mechanical stabilities, are studied. The dislocation density generated within ferrite by the mechanically induced martensitic transformation of retained austenite is shown to scale with the incremental work-hardening exponent. The acoustic emission generated during tensile straining was also measured. The acoustic emission was revealed to result mainly from dislocation motion, especially from the motion of the additional dislocation density generated in intercritical ferrite by the strain-induced martensitic transformation.
165 citations
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TL;DR: In this paper, a novel method is developed to back-calculate rock mass strength parameters from acoustic emission (AE) monitoring data in combination with FEM stress analysis, based on the important concept of generalized AE initiation threshold of rock masses.
163 citations