Topic
Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: The ability of using the acoustic signature of an impact to detect possible damage and the damage emergence in the case of damaging impact was confirmed in active mode and the ability of the health monitoring system to monitor disbond growth was demonstrated.
92 citations
••
TL;DR: In this paper, an acoustic emission-based technique is proposed to predict the residual fatigue life of two types of ceramic matrix composites CMC: SiCf/[Si-B-C] and Cf/[ Si-B]-C, loaded in static fatigue at high temperature.
Abstract: The present work deals with two types of ceramic matrix composites CMC: SiCf/[Si–B–C] and Cf/[Si–B–C], loaded in static fatigue at high temperature. An acoustic emission-based technique is proposed to predict the residual fatigue life. Indeed, two approaches based on the analysis of released energy are applied. A coefficient denoted RAE is evaluated. Moreover, a cumulative Benioff law commonly used for pre-seismic activations is applied. Under constant stress, micro-cracks are created, which generate elastic waves in a manner similar to earthquakes. The law predicted satisfactorily the time-to-failure of SiCf/[Si–B–C] composite under a constant load.
92 citations
••
TL;DR: In this paper, the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium-magnesium-alumina-silicate (BMAS) ceramic matrix composite were investigated.
Abstract: This study reports on the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium–magnesium–alumina–silicate (BMAS) ceramic matrix composite. The residual stress state of the composite was experimentally measured by interrogation of the tensile curves at a uniquely well-defined common intersection point of unloading–reloading cycles in the tensile domain. Notch presence was critical on the material’s mechanical response and promoted catastrophic failure shortly after the achievement of a saturated matrix crack state. The result of cyclic loading was an increase by 20% in sustainable stress throughout loading, as compared to pure tension. Scatter in elastic properties within specimens of different notch-to-width ratios was reconciled with theoretical expectations by application of a translation vector approach in the stress–strain plane, based on the material’s residual stress state. Acoustic emission and infrared thermography provided valuable insight into damage identification, location and sequence.
92 citations
••
TL;DR: In this article, a series of tests were conducted on some granite specimens using a true-triaxial strainburst test system and acoustic emission (AE) sensors were used to monitor the rock fracturing process.
Abstract: Pillar burst is one type of rockburst that occurs in underground mines. Simulating the stress change and obtaining insight into the pillar burst phenomenon under laboratory conditions are essential for studying the rock behavior during pillar burst in situ. To study the failure mechanism, a novel experimental technique was proposed and a series of tests were conducted on some granite specimens using a true-triaxial strainburst test system. Acoustic emission (AE) sensors were used to monitor the rock fracturing process. The damage evolution process was investigated using techniques such as macro and micro fracture characteristics observation, AE energy evolution, and b value analysis and fractal dimension analysis of cracks on fragments. The obtained results indicate that stepped loading and unloading simulated the pillar burst phenomenon well. Four deformation stages are divided as initial stress state, unloading step I, unloading step II, and final burst. It is observed that AE energy has a sharp increase at the initial stress state, accumulates slowly at unloading steps I and II, and increases dramatically at peak stress. Meanwhile, the mean b values fluctuate around 3.50 for the first three deformation stages and then decrease to 2.86 at the final stage, indicating the generation of a large amount of macro fractures. Before the test, the fractal dimension values are discrete and mainly vary between 1.10 and 1.25, whereas after failure the values concentrate around 1.25–1.35.
92 citations
••
TL;DR: In this paper, the uniaxial compression test of concrete was carried out based on acoustic emission (AE) in order to monitor the dynamic damage of concrete in real time and study the failure mechanism.
92 citations