37685
Yuyama, S.
Fundamental aspects of acoustic emission applications to the problems caused by corrosion Corrosion Monitoring in Industrial Plants using Nondestructive Testing and Electrochemical Methods. A symposium sponsored by ASTM Committee E-7 on Nondestructive Testing and Committee G-I on Corrosion of Metals, Montreal, Canada, 22-24 May 1984. pp. 43-74. ASTM Special Technical Publication 908 This paper describes the use of acoustic emission (AE) for the detection and monitoring of corrosion, stress corrosion cracking (SCC), and corrosion fatigue (CF). It surveys laboratory studies and field applications that have been made to date. The application of the technique to fundamental studies in the laboratory and continuous monitoring in engineering structures are discussed in detail. Various microprocesses that can produce detectable AE are shown and their relative energy levels, emanated as AE, are discussed in terms of peak amplitudes measured on laboratory specimens by a conventional piezoelectric sensor.
37485 Ivanov, V.I.;Kuranov, V.N.; Ryabov, A.N. Acoustic emission in low-cyclic fatigue Soviet Physics Doklady, Vol. 31, No. 6, pp. 517-518 (Jun. 1986) Well established theory and experimental data are used to develop a model of fatigue-crack growth (FCG). Pulsed elastic waves are emitted from a strain resistant but brittle material embedded in a material still prone to plastic deformation when the brittle material is caused to increase in volume. In addition to this acoustic emission, a crack is found to jump along the boundary of the two materials. A physically well defined parameter, easily verified experimentally is proposed to estimate the growth rate of fatigue cracks. 37478
Rogers, L.M.
The detection and monitoring of cracks in structures, process vessels and pipework by acoustic emission Hazards in the process industries: Hazards IX, a three-day symposium organized by The Institution of Chemical Engineers (North Western Branch), University of Manchester Institute for Science and Technology (United Kingdom), 2-4 Apr. 1986, pp. 201-214. The Institution of Chemical Engineers Symposium Series No. 97 Acoustic Emission monitoring of low fatigue life joints and defective weldments on offshore structures is providing new insight into the mechanism of fatigue crack propagation in these structures and strong evidence of the reliability of the method for the remote detection and monitoring of cracks. Results obtained during 1984/85 on three offshore structures are presented and compared with data from laboratory tests on large scale weldments. Hitherto problems with the sub-sea installation of
transducers, background noise, data condensation, equipment supervision and operational reliability have been solved by the development of new measurement and analysis instrumentation. The equipment is described. 37254
Busawon, M.; Augustyniak, B.; Fantozzi, G.; Rouby, D.
The relation between acoustic emission and damage caused by thermal fatigue and thermal shocks in structural ceramics Ceramic Materials and Components for Engines, Proceedings of the 2nd International Symposium, Lubeck-Travemunde (FRG) 14-17 Apr. 1986. pp. 799-806. Edited by W. Bunk and H. Hausner, Verlag Deutsche Keramische Gesellschaft (FRG), 1205 pp. (1986) The development of ceramics for high-temperature applications requires a full understanding of thermal shock and fatigue performance in relation to use geometry and mechanical loading. Ceramic materials are brittle and are susceptible to catastrophic failure under thermally generated stress. The primary purpose of this paper is to prove that the acoustic emission technique can lead to a prediction of thermal lifetime i.e. the duration over which a crack reaches a small critical length, after which failure is inevitable.
Kuleev, V.G.; Shcherbinin, V.E.; Zhakov, S.V.; Subbotin, Y. S,; Men'shikov, N.M.
37251
Effect of physical differences between the Barkhausen effect and Barkhausen acoustic emission on their application in nondestructive inspection Soviet Journal of Nondestructive Testing, Vol. 22, No. 9, pp. 573-585 (May 1987) The physical differences between the Barkhausen effect and Barkhausen acoustic emission are examined and recommendations are given with respect to the possibilities of using these phenomena in nondestructive inspection. 36990
Sachse, W.; Kim, K.Y.; Chen, C.P.
Studies of acoustic emission from point and extended sources Analytical Ultrasonics in Materials Research and Testing. Proceedings of a conference, NASA Lewis Research Center, Ohio (United States), 13- 14 Nov. 1984. pp. 49-59. NASA Conference Publication 2383 (1986). The use of simulated and controlled acoustic emission signals forms the basis of a powerful tool for the detailed study of various deformation and wave interaction processes in materials. We report the results of experiments and signal analyses of AE resulting from point sources such as various types of indentation-produced cracks in brittle materials and the growth of fatigue cracks in 7075-T6 aluminum panels. Furthermore, we describe our recent work dealing with the modeling and subsequent signal processing of an extended source of emission in a material. Results of the forward problem and the inverse problem are presented with the example of a source distributed through the interior of a specimen shown.
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NDT&E International Volume 25 Number 6 1992