A Novel Specimen Design for Multiaxial Loading Experiments at High Strain Rates

Yuan Xu, Govind Gour, Julian Reed, Antonio Pellegrino

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding


A specimen geometry that has four flat dog bones circumferentially arranged around the axis of the sample is proposed for combined tensile-torsional loading experiments. Finite-element modelling was implemented to optimise the design and achieve appropriate deformation and failure in both tensile and torsional loading conditions. The capability of the proposed specimen configuration is demonstrated via an experimental campaign on commercially pure titanium at various strain rates. The quasi-static tests were conducted using a universal screw-driven testing machine, whereas the high-rate experiments were carried out on an in-house designed combined tension-torsion Hopkinson bar system. A wide range of stress states were obtained using the ligament specimen, covering uniaxial tension, shear, and different combinations of tension and shear. Three distinct failure modes of the ligament specimens subjected to monotonic tension, monotonic torsion, and combined tension-torsion loading at high strain rates are presented and discussed. The quasi-static and high-rate ultimate stress loci will be constructed using direct experimental measurements to assess the strain rate sensitivity of the material.
Original languageEnglish
Title of host publicationDynamic Behavior of Materials, Volume 1 - Proceedings of the 2023 Annual Conference on Experimental and Applied Mechanics
PublisherSpringer, Cham
Number of pages6
ISBN (Electronic)978-3-031-50646-8
ISBN (Print)978-3-031-50645-1
Publication statusPublished - 20 Mar 2024

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


  • Combined tension-torsion
  • Failure mode
  • Hopkinson bar
  • Rate dependence
  • Specimen design

ASJC Scopus subject areas

  • Engineering(all)
  • Mechanical Engineering
  • Computational Mechanics


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