Multiscale damage evolution in polymer bonded sugar under dynamic loading

Suraj Ravindran, Addis Tessema, Addis Kidane

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Ultra-high-speed and high spatial resolution digital image correlation based experiments are performed to understand the sub grain level local failure mechanisms in polymer bonded explosives under dynamic loading. Polymer bonded sugar that mimics the mechanical properties of polymer bonded explosives is used in this study. The experiments are conducted in a split Hopkinson pressure bar setup at an intermediate strain rate. From the digital image correlation analyses, high strain localization was observed predominantly in the regions filled by the polymer binder surrounding the sugar crystals. The damage evolution was quantified by calculating the Poisson's ratio and volumetric strain as a function of loading. It was observed that the damage incubation is started at a very small global strain and causes mechanical softening in the material that leads to shear band formation. Also, the possible hotspot mechanism in the material was seen to be frictional heating of crystals and de-bonding of the polymer binder.

Original languageEnglish (US)
Pages (from-to)97-106
Number of pages10
JournalMechanics of Materials
Volume114
DOIs
StatePublished - Nov 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Keywords

  • Dynamic experiments
  • Energetic material
  • Meso scale
  • PBS
  • PBX

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