Elastic waves in particulate glass-rubber mixtures

Kianoosh Taghizadeh*, Holger Steeb, Stefan Luding, Vanessa Magnanimo

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We investigate the propagation of waves in dense static granular packings made of soft and stiff particles subjected to hydrostatic stress. Physical experiments in a triaxial cell equipped with broadband piezoelectric wave transducers have been performed at ultrasound frequencies. The time of flight is measured in order to study the combined effect of applied stress and rubber content on the elastic properties of the mixtures. The bulk stiffness deduced from the wave speed is nonlinear and non-monotonic with the increasing percentage of rubber with a more prominent effect at higher pressures. Moreover, in the frequency domain, a spectral analysis gives insights on the transition from a glass- to a rubber-dominated regime and the influence of rubber particles on the energy dissipation. Mixtures with rubber content below 30% show enhanced damping properties, associated with slightly higher stiffness and lighter weight.

Original languageEnglish
Article number20200834
Number of pages18
JournalProceedings of the Royal Society A: mathematical, physical and engineering sciences
Volume477
Issue number2249
DOIs
Publication statusPublished - 12 May 2021

Keywords

  • attenuation
  • elastic stiffness
  • granular mixture
  • wave propagation

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