Stress Wave Attenuation in Aluminum Alloy and Mild Steel Specimens Under SHPB Tensile Testing

J. R. Pothnis, G. Ravikumar, H. Arya, Chandra S. Yerramalli, N. K. Naik

Research output: Contribution to journalArticlepeer-review

Abstract

Investigations on the effect of intensity of incident pressure wave applied through the striker bar on the specimen force histories and stress wave attenuation during split Hopkinson pressure bar (SHPB) tensile testing are presented. Details of the tensile SHPB along with Lagrangian x–t diagram of the setup are included. Studies were carried out on aluminum alloy 7075 T651 and IS 2062 mild steel. While testing specimens using the tensile SHPB setup, it was observed that the force calculated from the transmitter bar strain gauge was smaller than the force obtained from the incident bar strain gauge. This mismatch between the forces in the incident bar and the transmitter bar is explained on the basis of stress wave attenuation in the specimens. A methodology to obtain force histories using the strain gauges on the specimen during SHPB tensile testing is also presented. Further, scanning electron microscope images and photomicrographs are given. Correlation between the microstructure and mechanical properties is explained. Further, uncertainty analysis was conducted to ascertain the accuracy of the results.

Original languageEnglish
Pages (from-to)677-686
Number of pages10
JournalJournal of Materials Engineering and Performance
Volume27
Issue number2
DOIs
Publication statusPublished - 1 Feb 2018
Externally publishedYes

Keywords

  • Lagrangian x–t diagram
  • photomicrograph
  • strain measurement
  • stress wave attenuation in specimens
  • tensile high strain rate testing
  • uncertainty analysis

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