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, the authors employed iterative methods to obtain the variations of propagation velocity with strain and found that while the individual contributions of the initial stresses, changes in elastic constants, and changes in density with strain can be considerable, their combined effect in some materials may be reduced by mutual cancellation.
Abstract: Variations of elastic constants and density with strain and the introduction of stresses can significantly affect the propagation velocity of surface acoustic waves Digital computation using iterative methods is employed to obtain the variations of propagation velocity with strain It is found that while the individual contributions of the initial stresses, changes in elastic constants, and changes in density with strain can be considerable, their combined effect in some materials may be reduced by mutual cancellation Computed results for YX quartz YZ LiNbO3 are compared with experimentally measured values
68 citations
TL;DR: In this paper, a series of constant loading tests under different confining pressures and temperatures with acoustic emission monitoring have been performed to study evolution of dilatancy (damage) and strength degradation.
68 citations
TL;DR: In this paper, the acoustic emission (AE) signals of coal ruptures were evaluated under the condition of uniaxial compression, and then the spectral, energy and fractal features of the AE waveform under different stress levels were analyzed.
68 citations
TL;DR: A low-cost acoustic emission (AE) location system based on a Field Programmable Gate Array PC (FPGA-PC) and a LOCAN 320 AE analyzer was used in this paper.
Abstract: In this paper, four main types of corrosion: uniform, pitting, crevice and stress corrosion cracking (SCC) found in the petrochemical industry, were characterized and identified by Acoustic Emission (AE) analysis using their locations and extracted AE parameters. A novel low-cost AE location system based on a Field Programmable Gate Array PC (FPGA-PC) and a LOCAN 320 AE analyzer were utilized in this study. Specimens used in experiments were austenitic stainless-steel SS304. The pattern of AE signals from each type of corrosion was plotted using their location and correlation. Experimental results show the ability of our FPGA-PC system to determine corrosion locations. The correlations of AE parameters including amplitude, counts, hits and time were used to identify different types of corrosion. In addition, the characteristics of the corrosion process for each type are explained using the AE signals obtained corresponding to the source locations, together with experimental observation.
68 citations
TL;DR: In this paper, the influence of shear rate on the mechanical behavior of rough rock joints prepared using a molding method was examined by testing jointed samples of four rock joint groups, which were obtained from the underground caverns of the Huangdao State Oil Reserves in China.
68 citations