Piezo-driven clamp release for synchronisation and timing of combined direct-shear stress waves

Junyi Zhou, Yuan Xu, Lukasz Farbaniec, Antonio Pellegrino

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)


We propose a novel double clamp Tension-Torsion Hopkinson bar (TTHB) technique for measuring material responses under combined direct-shear loading. The proposed method overcomes the limitations of the existing high rate loading techniques by allowing arbitrary loading paths of tension and torsion to be prescribed to the specimen. High speed piezo actuators were employed to enable the synchronisation of direct stress and shear stress waves. The system also allows flexibility of control on the arrival times of torsional and tensile waves, thus enabling the generation of different dynamic loading paths. Direct and shear stress pulses can be generated such a way to achieve synchronised loading, torsion loading followed by tensile loading, and vice versa. The stress pulse histories of three different loading paths are presented to illustrate and validate the technique.

Original languageEnglish
Article number104672
JournalInternational Journal of Impact Engineering
Early online date4 Jun 2023
Publication statusPublished - 31 Oct 2023


  • Combined normal-shear stress
  • High rate loading path
  • Piezo
  • Stress waves synchronisation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Safety, Risk, Reliability and Quality
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering


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