Abstract
Recently, the acoustic emission (AE) technique has been widely applied in the field of geotechnical engineering. One of the main applications of this technique is to locate damage sources, which is known as the AE source location technique. In this research, the 3D AE source location technique based on the time difference of arrival is verified by conducting pencil lead break (PLB) tests on a cylindrical metal specimen. From the results of this study, the existing method is proven to have the least error in terms of distance from the coordinate origin, but with some errors along x, y, and z axes. When the PLB sources originate in the middle part of the specimen, the calculated result has a higher accuracy, as compared to other positions. It seems that the calculated AE sources tend to be concentrated on the central part with some errors. Moreover, outside noises induced by a hammer hit have virtually no effect on this AE source location technique.
Highlights
As a non-destructive testing method, acoustic emission (AE, i.e., stress wave emission) has been widely applied in concrete, rock, wood, ceramic, and so on
ReFsuigltusre 5 presents the location of the calculated AE sources and the pre-set pencil lead break (PLB) sources in allFtigesutrse. 5Thperebselanctsktchierclloecsatsitoanndoffothrethcaelcpurlea-tesdetAPELBsosuorucersceasn.dTthhee rperde-hseetxPagLoBns show tshoeurceessuilntsaollnteAstsp. oTihnet,btlhacekgcriercelnesosntaensdshfoorwthBe pproei-nset,t aPnLdB tshouerbcelus.eTohneersedshhoewxagConpsoint
The results on C point, marked as blue columns, were positive, with a larger error of up to 30%, which means that the calculated result was higher than the pre-set PLB source. It seems that the calculated AE sources tended to be concentrated on the central part, with some errors, which is mentioned in the pile model test by Hamaguchi et al [17]
Summary
As a non-destructive testing method, acoustic emission (AE, i.e., stress wave emission) has been widely applied in concrete, rock, wood, ceramic, and so on. It comes from the transient elastic waves generated by the rapid release of energy in the local stress concentration region inside a stressed material [1]. In the field of geotechnical engineering, AE sensors can help to detect the micro noises released from particle interactions, such as particle crushing and/or sliding. Due to such particle interactions, shearing resistance is mobilized in sandy soils. A growing number of researchers have been exploring the potential of applying the AE technique to locate shear bands in sandy soils [3,4]
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