On the development of a release mechanism for a Split Hopkinson tension and compression bar

Georg Baumann*, Christian Ellersdorfer, Florian Feist, Dominik Niederkofler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Split Hopkinson bars are used for the dynamic mechanical characterisation of materials under high strain rates. Many of these test benches are designed in such a way that they can either be used for compressive or tensile loading. The goal of the present work is to develop a release mechanism for an elastically pre-stressed Split Hopkinson bar that can be universally used for tensile or compressive loading. The paper describes the design and dimensioning of the release mechanism, including the brittle failing wear parts from ultra-high strength steel. Additionally, a numerical study on the effect of the time-to-full-release on the pulse-shape and pulse-rising time was conducted. The results of the analytical dimensioning approaches for the release mechanism, including the wear parts, were validated against experimental tests. It can be demonstrated that the designed release concept leads to sufficiently short and reproducible pulse rising times of roughly 0.11 ms to 0.21 ms, depending on the pre-loading level for both the tension and compression wave. According to literature, the usual pulse rising times can range from 0.01 ms to 0.35 ms, which leads to the conclusion that a good average pulse rising time was achieved with the present release system.
Original languageEnglish
Article number7609
Number of pages16
JournalMaterials
Volume14
Issue number24
DOIs
Publication statusPublished - 1 Dec 2021

Keywords

  • brittle failure
  • release mechanism
  • Split Hopkinson bar
  • trigger duration
  • Trigger duration
  • Release mechanism
  • Brittle failure

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this