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Experimental Mechanics

, Volume 39, Issue 2, pp 81–85 | Cite as

A split Hopkinson bar technique for low-impedance materials

  • W. Chen
  • B. Zhang
  • M. J. Forrestal
Article

Abstract

An experimental technique that modifies the conventional split Hopkinson pressure bar has been developed for measuring the compressive stress-strain responses of materials with low mechanical impedance and low compressive strengths such as elastomers at high strain rates. A high-strength aluminum alloy was used for the bar materials instead of steel, and the transmission bar was hollow. The lower Young's modulus of the aluminum alloy and the smaller cross-sectional area of the hollow bar increased the amplitude of the transmitted strain signal by an order of magnitude as compared to a conventional steel bar. In addition, a pulse shaper lengthened the rise time of the incident pulse to ensure stress equilibrium and homogeneous deformation in the low-impedance specimen. Experimental results show that the high strain rate, compressive stress-strain behavior of an elastomeric material can be determined accurately and reliably using this technique.

Keywords

High Strain Rate Transmitted Strain Conventional Split Transmitted Strain Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Society for Experimental Mechanics, Inc. 1999

Authors and Affiliations

  • W. Chen
    • 1
  • B. Zhang
    • 2
  • M. J. Forrestal
    • 3
  1. 1.Department of Aerospace and Mechanical EngineeringUniversity of ArizonaTucson
  2. 2.Department of Materials Science and EngineeringUniversity of ArizonaTucson
  3. 3.Sandia National LaboratoriesAlbuquerque

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