Measurements of Dynamic Properties of Materials. Volume 5. OFHC Copper
GENERAL MOTORS TECHNICAL CENTER WARREN MI MATERIALS AND STRUCTURES LAB
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Results of an experimental study on the dynamic properties of OFHC copper 12-hard are presented. Areas studied included stress-strain-strain rate and reverse loading behavior, elastic constants, equation of state, compressive and release wave characteristics, and spall fracture. The material showed approximately elastic-perfectly plastic behavior under uniaxial stress compression with slight rate sensitivity 0.005 to 950sec strain rates and 20, 204 and 370C. Longitudinal and shear wave velocities at 20C were 4.757 and 2. 247 mmmicrosec, and temperature and pressure dependence was also measured and various elastic constants were calculated. The shock wave equation of state EOS was measured from 10 to 200 kbars as sigma-H 1.5 344 u sub p 143 u sub p to the 2nd power. The EOS was also calculated from the elastic constants and comparisons made with the shock wave EOS. Compressive wave tests showed a ramped, non-steady-state elastic precursor with very rapid decay 80 in 2 mm . The yield level from compressive wave profile measurements was considerably lower than that determined from uniaxial stress and EOS tests. Shock wave profiles showing both release wave behavior and attenuation were obtained. The impact velocity required for spall fracture was found to increase with decreasing pulse width.
- Metallurgy and Metallography