Investigation on experimental method of low-impedance materials using modified Hopkinson pressure bar

Ying Gang Miao, Yu Long Li, Qiong Deng, Zhong Bin Tang, Hai Tao Hu, Tao Suo

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

To increase the detectability of split Hopkinson pressure bar (SHPB) of low-impedance materials, modifications were conducted on traditional SHPB apparatus with a PMMA tube to output transmitted signal, and weak signals were further amplified by semiconductor strain gauges. Experiments on soft rubbers and cushioning foam materials were carried out. In order to analyze the accuracy of the experimental results, the stress equilibrium issues involved in the assumptions of SHPB were investigated. First, by way of re-constructing loading process of incident wave, the stressstrain curve was obtained, along with the stress equilibrium ratio of specimen. Secondly, the influences on the accuracy of stress-strain curves were investigated through the elastic modulus comparisons. And the results illustrate that the bilinear incident wave from experiments can ensure the stress equilibrium deformation of specimen after 2 normalized times, much sooner than ramp incident waves. Moreover, it even facilitates specimen deformation with a constant strain rate. The results confirm that the detectability of the modified SHPB can be down to tens kPa with enough accuracy level.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalJournal of Beijing Institute of Technology (English Edition)
Volume24
Issue number2
DOIs
StatePublished - 1 Jun 2015

Keywords

  • Bilinear wave
  • Constant strain rate
  • Low-impedance materials
  • SHPB
  • Stress equilibrium

Fingerprint

Dive into the research topics of 'Investigation on experimental method of low-impedance materials using modified Hopkinson pressure bar'. Together they form a unique fingerprint.

Cite this