High Strain Rate Testing of a Low Carbon Steel to High Strains over a Range of Temperatures, Using a Torsional Hopkinson-bar Apparatus

Abstract

A recent version of a torsional Hopkinson-bar apparatus, capable of high strains such as found in metal working, is briefly described. The magnitude of axial forces and bending waves in the system during a test is determined and their effects on measured flow stress shown to be negligible. Test results for a low carbon free-machining steel are given, for shear strain rates up to 4330/s and temperatures up to 500C. In all but one case this material fractured in the dynamic tests before the potential strain was realized, but shear strains of about 1.3 were usually obtained. Because of the large strains, adiabatic heating during the dynamic tests had a substantial effect on the stress-strain curves. The dynamic strain ageing effect was clearly evident from the tests at 400C and 500C.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1974
Accession Number
ADA035025

Entities

People

  • J. D. Campbell
  • M. G. Stevenson

Organizations

  • University of Oxford

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Alloys
  • Axial Loads
  • Bending Moments
  • Computer Programming
  • Computer Programs
  • Diameters
  • Dynamic Tests
  • High Temperature
  • Machining
  • Materials
  • Shear Stresses
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Temperature Gradients
  • Titanium

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Thermal Physics or Thermal Science.