Determination of dynamic elastic modulus of polymeric materials using vertical split Hopkinson pressure bar

Ying Gang Miao, Yu Long Li, Hong Yuan Liu, Qiong Deng, Luming Shen, Yiu Wing Mai, Ya Zhou Guo, Tao Suo, Hai Tao Hu, Fa Qin Xie, Long Zhao, Yong Jian Mao, Wei Qi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

70 Citations (Scopus)

Abstract

This paper is focused on the determination of dynamic elastic modulus of polymer materials under high strain rate loading using the split Hopkinson pressure bar (SHPB) technique. Experiments conducted on the epoxy specimen by the traditional SHPB and the proposed vertical SHPB equipment demonstrates that the vertical SHPB can give more accurate measurements. The related factors, namely, the effect of stress inequilibrium in specimen, indentation in bars due to specimen and the tilt between specimen and bars, are extensively studied. It is concluded through theoretical analysis and numerical calculations that the influence of stress inequilibrium becomes negligible after two characteristic times. The numerical study on the indentation effect shows that the bar to specimen specific elastic modulus ratio and specific diameter ratio are critical to the level of influence on indentation. However, polymers with low elastic modulus values can still be accurately measured regardless of the indentation displayed. The numerical investigation on tilt effect indicates that the imperfect contact condition severely affects the accuracy of measured elastic modulus. This issue can be rectified by the newly proposed vertical SHPB. It can improve the contact conditions between bars and specimen significantly and offer acceptable accurate measurements for the dynamic elastic modulus of polymeric materials.

Original languageEnglish
Pages (from-to)188-196
Number of pages9
JournalInternational Journal of Mechanical Sciences
Volume108-109
DOIs
Publication statusPublished - 1 Apr 2016
Externally publishedYes

Keywords

  • Dynamic elastic modulus
  • Hopkinson pressure bar
  • Indentation effect
  • Stress equilibrium
  • Tilt effect

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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