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, changes in elastic moduli measured during increasing amplitude cyclic stressing experiments on dry and water-saturated samples of Etna basalt were reported, showing that the Young's modulus decreased by approximately 30% over the total sequence of loading cycles, and the Poisson's ratio increased by a factor of approximately 3±0.5.
202 citations
TL;DR: In this paper, the first experimental measurements of brittle deformation in a basic igneous rock (a basalt from Mt. Etna volcano) under triaxial stress conditions were presented.
202 citations
TL;DR: In this paper, an alternative method to first threshold crossing for acoustic emission (AE) source location is presented for wave propagation in dispersive media, the accuracy of source location can be improved by locating corresponding phase points on the transducer outputs to determine the difference in arrival times.
Abstract: In this paper an alternative method to first threshold crossing for acoustic emission (AE) source location is presented. For wave propagation in dispersive media, the accuracy of source location can be improved by locating corresponding phase points on the transducer outputs to determine the difference in arrival times. The phase point location was done by cross‐correlating the transducer outputs with a single frequency cosine wave modulated by a Gaussian pulse. Experiments were performed using a lead break as the AE source on the surface of an aluminum plate. Due to the plate geometry and source orientation, the wave produced was highly dispersive. Although this wave was unsuitable for first threshold crossing techniques, the time differences needed for triangulation could be determined using the cross‐correlation technique.
200 citations
200 citations
TL;DR: The objective function of the triangulation technique is modified further to overcome the inherent difficulties associated with multiple singularities and to maximize the efficiency of the acoustic emission data for multiple receiving sensors.
199 citations