Instrumented Impact Testing Using a Hopkinson Bar Apparatus

Abstract

A technique for conducting instrumented Charpy impact tests using a Hopkinson bar is presented. Data for three grades of beryllium covering a range in impact velocities from 20 to 200 in/sec (.5 to 5 mm/s) are obtained in the form of load-deflection curves from which maximum load, maximum deflection, and total energy are obtained. Results show good agreement with data on identical materials obtained from an instrumented impact test at 54 in/sec (1.37 m/s) and from a standard Charpy impact machine at 135 in/sec (3.43 m/s). The advantages and limitations of the Hopkinson bar apparatus are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1975
Accession Number
ADA014792

Entities

People

  • T. Nicholas

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Air Force Facilities
  • Beryllium
  • Charpy Impact Tests
  • Chemical Analysis
  • Deflection
  • Impact Tests
  • Instrumentation
  • Materials
  • Materials Laboratories
  • Measurement
  • Metals
  • Standards
  • Strain Gages
  • Tensile Strength
  • Test Methods

Readers

  • Mechanical Engineering/Mechanics of Materials.