Accession Number:

AD0628977

Title:

THE MECHANICAL PROPERTIES OF COPPER AT HIGH STRAIN RATES. VOLUME II. ANALYTICAL AND EXPERIMENTAL PLASTIC STRAIN PROFILES IN HIGH VELOCITY IMPACT.

Descriptive Note:

Rept. for 1 May 63-28 Feb 65,

Corporate Author:

COLORADO SCHOOL OF MINES RESEARCH FOUNDATION INC GOLDEN

Personal Author(s):

Report Date:

1966-02-01

Pagination or Media Count:

113.0

Abstract:

Cold-drawn copper rods were end-impacted with projectiles having lengths of 1 to 5 inches and initial velocities of 500 to 1240 in.sec, and the resulting plastic strain profiles were measured. Also the strain profiles were calculated using a numerical method based on the method of characteristics and on material properties which are rate sensitive. The reliability of the concepts employed in these calculations was indicated by the good agreement between the measured and calculated strain profiles. Strain rate exponent, defined as the slope of the curve of log stress versus log plastic strain rate, was found by these calculations to increase with increasing strain rate, reaching a value of about 0.04 at a plastic strain rate, reaching a value of about 0.04 at a plastic strain rate of 400sec. Author

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE