Characterization of particle impact by quantitative acoustic emission

Buttle, D.J.; Scruby, C. B.

doi:10.1016/0043-1648(90)90018-6

Cited by 69 publications

(60 citation statements)

References 6 publications

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“…The observations led McBride et al [11] to propose that the source of AE during fatigue crack growth was intense plastic flow ahead of the growing crack. An elegant investigation carried out in England [12] has suggested that the AE during fatigue crack growth in 7075 aluminum alloys is due to the actual advancement of the fatigue crack, and work by Heiple et al [13] has shown that the AE signal produced by deformation in the plastic zone ahead of the growing fatigue crack is too small for the observed AE. The elastic energy released by the actual crack advance is consistent with the size of the AE signals produced.…”

Section: Experiments #2mentioning

confidence: 99%

A Comparison of AE Measurements from Aluminum Alloys and Glass/Epoxy Composites with Different AE Techniques

Carpenter

Gorman

1998

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Experiments #2mentioning

confidence: 99%

A Comparison of AE Measurements from Aluminum Alloys and Glass/Epoxy Composites with Different AE Techniques

Carpenter

Gorman

1998

Review of Progress in Quantitative Nondestructive Evaluation

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“…S(t) and G(t) could be obtained from a simulation of AE waveform by nite element method and experimental method of sharp pencil lead breaking 13) . Then, I(t) was estimated by the deconvolution technique from detected V(t), calculated S(t) and G(t) 14) . Figure 2 shows example of AE waveforms detected during LSP process in experimental setup as shown in Fig.…”

Section: Ae Measurement and Inverse Analysismentioning

confidence: 99%

Effect of Confinement Layer on Laser Ablation and Cavitation Bubble during Laser Shock Peening

et al. 2016

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Laser shock peening (LSP) is one of surface treatments to induce residual compressive stresses near metal surface to improve the resistance of materials to surface-related failures, such as fatigue and stress corrosion cracking. In LSP process, short pulsed laser is focused and irradiated to the material covered by transparent overlay such as glass or water. This transparent overlay is also known as a con nement layer and has an important role to increase impact pressure during LSP process. When con nement layer is liquid, the characteristics of the layer such as temperature, viscosity, etc. affect the phenomena occurring during the peening process and undoubtedly in uence the induced residual stress. In the present study, Acoustic Emission (AE) technique coupling with high speed camera was applied to study the effect of con nement layer on LSP process. The results were discussed using the impact force calculated by inverse analysis of detected AE waveforms and bubble parameters observed by high speed camera. The results showed that temperature, thickness and viscosity of con nement layer had strong in uence on the generation and collapse of cavitation bubble. The optimization of process parameters could be obtained by AE technique.

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“…In this setting the sound is radiated into the surrounding air and recorded by a microphone [6]. Controlled experiments have also shown that time domain signals from particles colliding with a plate can be used to recover the size of a single impacting particle ( [7], [8]). However, this approach depends on identifying the contact duration which is not practical in multi-particle, particle plate interactions such as in a stirred, particle laden fluid in a reactor vessel [9].…”

Section: Introductionmentioning

confidence: 99%

P1H-2 Particle Sizing in the Process Industry using Hertz-Zener Impact Theory and Acoustic Emission Spectra

Gachagan

Mulholland

Hayward

et al. 2006

2006 IEEE Ultrasonics Symposium

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This version is available at https://strathprints.strath.ac.uk/18669/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.Particle Sizing in the Process Industry using Hertz-Zener Impact Theory and Acoustic Emission Spectra Abstract-The cost of implementing real-time monitoring and control of industrial processes is a significant barrier for many companies. Acoustic techniques provide complementary information to optical spectroscopic sensors and have a number of advantages: they are relatively inexpensive, can be applied non-invasively, are non-destructive, multi-point measurements are possible, opaque samples can be analysed in containers that are made from opaque materials (e.g. steel or concrete) and the analysis can be conducted in real-time.In this paper a new theoretical model is proposed which describes the transport of particles in a stirred reactor, their collision with the reactor walls, the subsequent vibrations which are then transmitted through the vessel walls, and their detection by an ultrasonic transducer. The particle-wall impact is modelled using Hertz-Zener impact theory. Experimental data is then used in conjunction with this (forward) model to form an inverse problem for the particle size distribution using a least squares cost function. Application of an integral smoothing operator to the power spectra greatly enhances the accuracy and robustness of the approach. One advantage of this new approach is that since it operates in the frequency domain, it can cope with the industrially relevant case of many particle-wall collisions.The technique will be illustrated using data from a set of controlled experiments. In the first instance a set of simplified experiments involving single particles being dropped in air onto a substrate are utilised. The second set of experiments involves particles in a carrier fluid being stirred in a reactor vessel. In each case the approach is able to successfully recover the associated...

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Characterization of particle impact by quantitative acoustic emission

Cited by 69 publications

References 6 publications

A Comparison of AE Measurements from Aluminum Alloys and Glass/Epoxy Composites with Different AE Techniques

A Comparison of AE Measurements from Aluminum Alloys and Glass/Epoxy Composites with Different AE Techniques

Effect of Confinement Layer on Laser Ablation and Cavitation Bubble during Laser Shock Peening

P1H-2 Particle Sizing in the Process Industry using Hertz-Zener Impact Theory and Acoustic Emission Spectra

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