THE MECHANICAL PROPERTIES OF COPPER AT HIGH STRAIN RATES. VOLUME 1. THE EFFECT OF STRAIN RATE ON THE FLOW STRESS OF COPPER

Abstract

An experimental method of determining dynamic flow stress where the stress is homogeneous is developed using a pendulum bar suspension system. A small specimen is mounted on the end of one of the bars and the other bar is impacted on the free and of the specimen. For copper, the dynamic stress is 29% larger than the static stress for a strain rate of about 100/sec (or an increase in strain rate of about 5 orders of magnitude). For various tests, the increase in dynamic stress over the static value varied from 17% to 45%. This variation is comparable with the expected scatter for a typical test (plus or minus 10%) predicted from the uncertainties in measurement.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1966
Accession Number
AD0628865

Entities

People

  • J. D. Lubahn
  • R. C. Culver
  • R. L. Straw

Organizations

  • Colorado School of Mines

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Contracts
  • Energy
  • Equations
  • Error Analysis
  • Friction
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Numerical Analysis
  • Pendulums
  • Potential Energy
  • Strain Gages
  • Strain Rate
  • Vibration
  • Wave Propagation
  • Waves

Readers

  • Mathematics or Statistics
  • Mechanical Engineering/Mechanics of Materials.