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Acoustic emission generated by glass beads in compression and shearing

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journal contribution
posted on 28.08.2019, 12:48 authored by Alister SmithAlister Smith, Neil DixonNeil Dixon
Acoustic emission (AE) monitoring offers the potential to sense particle-scale interactions that lead to macro-scale responses of granular materials. This paper presents results from a programme of drained triaxial tests performed on densely packed glass beads to establish quantitative interpretation of AE during isotropic compression, shearing and associated stick–slip events. Relationships have been quantified between: AE and boundary work (i.e. AE generated per Joule) for a unit volume of glass beads under isotropic compression and shear; AE and shear displacement rate; and the amplitude of deviator stress cycles and AE activity during stick–slip events. In shear, AE generation increased with shear strain and reached peak values that were maintained from volume minimum (i.e. the transition from contractive to dilative behaviour) to peak dilatancy, whereupon AE generation gradually reduced and then remained around a constant mean value with further increments of shear strain. In each stick–slip event, AE activity increased during shear strength mobilisation, particle climbing and dilation, and then reduced with the subsequent deviator stress drop during particle sliding and contraction. The amplitude of these cycles in AE activity were governed by the amplitude of deviator stress cycles during stick–slip events, which were also proportional to the imposed stress level and inversely proportional to particle size.

Funding

EPSRC Fellowship (Listening to Infrastructure, EP/P012493/1)

History

School

  • Architecture, Building and Civil Engineering

Published in

Granular Matter

Volume

21

Publisher

Springer

Version

VoR (Version of Record)

Rights holder

© The Authors

Acceptance date

02/08/2019

Publication date

2019-08-27

Copyright date

2019

ISSN

1434-5021

eISSN

1434-7636

Language

en

Depositor

Dr Alister Smith

Article number

92

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