The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
M. Talebzadeh - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Emission monitoring of fatigue crack propagation
Journal of Constructional Steel Research, 2003Co-Authors: T M Roberts, M. TalebzadehAbstract:Abstract The monitoring of fatigue crack propagation in steel and welded steel compact tension and T-section girder test specimens, using an advanced Acoustic Emission system with accurate source location, is described. The compact tension test specimens were subjected to load ratios of 0.1, 0.3, 0.5 and 0.7 while the T-section girders were subjected to a load ratio of 0.3. Located Acoustic Emission events were filtered for a narrow band containing the fatigue crack, and separated for different regions of the applied load range. The test results indicate that Acoustic Emission count rates, for small percentages of the applied load range close to the peak load, show reasonable correlation with crack propagation rates. Based on these correlations it may be possible to predict the remaining service life of fatigue damaged structures from the results of short term Acoustic Emission monitoring.
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Acoustic Emission monitoring of fatigue crack propagation
Journal of Constructional Steel Research, 2003Co-Authors: T M Roberts, M. TalebzadehAbstract:The monitoring of fatigue crack propagation in steel and welded steel compact tension and T-section girder test specimens, using an advanced Acoustic Emission system with accurate source location, is described. The compact tension test specimens were subjected to load ratios of 0.1, 0.3, 0.5 and 0.7 while the T-section girders were subjected to a load ratio of 0.3. Located Acoustic Emission events were filtered for a narrow band containing the fatigue crack, and separated for different regions of the applied load range. The test results indicate that Acoustic Emission count rates, for small percentages of the applied load range close to the peak load, show reasonable correlation with crack propagation rates. Based on these correlations it may be possible to predict the remaining service life of fatigue damaged structures from the results of short term Acoustic Emission monitoring. © 2002 Elsevier Science Ltd. All rights reserved.
T M Roberts - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Emission monitoring of fatigue crack propagation
Journal of Constructional Steel Research, 2003Co-Authors: T M Roberts, M. TalebzadehAbstract:Abstract The monitoring of fatigue crack propagation in steel and welded steel compact tension and T-section girder test specimens, using an advanced Acoustic Emission system with accurate source location, is described. The compact tension test specimens were subjected to load ratios of 0.1, 0.3, 0.5 and 0.7 while the T-section girders were subjected to a load ratio of 0.3. Located Acoustic Emission events were filtered for a narrow band containing the fatigue crack, and separated for different regions of the applied load range. The test results indicate that Acoustic Emission count rates, for small percentages of the applied load range close to the peak load, show reasonable correlation with crack propagation rates. Based on these correlations it may be possible to predict the remaining service life of fatigue damaged structures from the results of short term Acoustic Emission monitoring.
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Acoustic Emission monitoring of fatigue crack propagation
Journal of Constructional Steel Research, 2003Co-Authors: T M Roberts, M. TalebzadehAbstract:The monitoring of fatigue crack propagation in steel and welded steel compact tension and T-section girder test specimens, using an advanced Acoustic Emission system with accurate source location, is described. The compact tension test specimens were subjected to load ratios of 0.1, 0.3, 0.5 and 0.7 while the T-section girders were subjected to a load ratio of 0.3. Located Acoustic Emission events were filtered for a narrow band containing the fatigue crack, and separated for different regions of the applied load range. The test results indicate that Acoustic Emission count rates, for small percentages of the applied load range close to the peak load, show reasonable correlation with crack propagation rates. Based on these correlations it may be possible to predict the remaining service life of fatigue damaged structures from the results of short term Acoustic Emission monitoring. © 2002 Elsevier Science Ltd. All rights reserved.
Haydn N. G. Wadley - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Emission: Nature’s Ultrasound
Review of Progress in Quantitative Nondestructive Evaluation, 2014Co-Authors: Haydn N. G. WadleyAbstract:Acoustic Emission refers to the ultrasonic signals (elastic waves) emitted by materials undergoing microscopic changes of stress state. This naturally generated ultrasound is distinctly related to the source process (dislocation motion, fracture, and some phase changes). For example, the waveform of an Acoustic Emission from a crack propagation increment contains information about the location, growth distance, velocity, and orientation of the crack. Acoustic Emission then is of interest as a naturally occurring phenomenon for the characterization of deformation and fracture mechanisms. It is also of interest as a possible passive monitoring technique for detecting, locating, and characterizing defects in structures. The current state-of-the-art of these applications is reviewed here in the context of an emerging science base, and future trends discussed.
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Acoustic Emission for physical examination of metals
International Materials Reviews, 2013Co-Authors: Haydn N. G. Wadley, C. B. Scruby, J. H. SpeakeAbstract:AbstractAcoustic-Emission techniques are beginning to be frequently used as a means of detecting and locating deformation and fracture processes in both metallic and non-metallic engineering structures. This has happened despite a relatively poor understanding of the basic physical processes involved in the generation, propagation, and detection of Acoustic-Emission signals, and of the influence in metals of factors such as composition and microstructure, upon the Acoustic Emission from different types of deformation and fracture processes. The measurement of Acoustic Emission, potentially, could yield much information about dynamic aspects of these processes. However, it is shown that the limitations of existing Acoustic-Emission recording instrumentation have enabled only qualitative information to be obtained to date. Even this data, however, has demonstrated that metallurgical variables greatly affect the AcousticEmission response of metals, and simple models to account for this are discussed.
Michael R. Gorman - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Emission for the 1990s
IEEE 1991 Ultrasonics Symposium, 1991Co-Authors: Michael R. GormanAbstract:An overview of recent results which provide new directions for Acoustic Emission (AE) technology during this decade is given. The 1990s will see new quantitative Acoustic Emission test methods develop as new technology takes advantage of progress in understanding AE practice. New aspects of AE described herein include different theoretical perspectives, accurate source location in anisotropic materials, broadband waveform measurements, and filtering out background noise. Also mentioned are the technologies needed in order to realize the practical contributions this technique can make to society. >
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Plate wave Acoustic Emission
Journal of the Acoustical Society of America, 1991Co-Authors: Michael R. GormanAbstract:Plate theory is more easily applied to the analysis of composite laminates than exact three‐dimensional elasticity theory. Under conditions such that plate theory is applicable, it is suggested that plate waves are useful for understanding Acoustic Emission (AE) phenomena. To test this idea, pencil leads were broken on aluminum plates and composite plates, and the resulting waves were detected with a broadband ultrasonic transducer. Both the fundamental extensional and flexural modes were observed. Their characteristics are described and the implications for AE source location are discussed as well. Several transducers, commonly used for Acoustic Emission measurements, are compared with regard to their ability to reproduce the characteristic shapes of plate waves. Their different responses show why similar test specimens and test conditions can yield disparate results.
Fei Ren-yuan - One of the best experts on this subject based on the ideXlab platform.
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Study on Acoustic Emission Pipeline Leak Detection
Journal of Beijing Polytechnic University, 2020Co-Authors: Fei Ren-yuanAbstract:A model was constructed in laboratory to simulate the Acoustic Emission pipeline leak detection. Under different test condition, such as changing the pressure of liquid, the size of leak hole, orientation of sensors, distance etc, the experiment of Acoustic Emission pipeline leak detection was implemented. From the analysis of the Acoustic Emission signal, whether the pipeline was leaky could be judged qualitatively, and the relationship respectively between the Acoustic Emission signal and pressure, hole size, sensor orientation, distance, etc. was also studied. The qualitative investigation provides groundwork for quantitative investigation of the Acoustic Emission pipeline leak detection.
