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Measurement of Strain Rate Effects in Metals.
LEHIGH UNIV BETHLEHEM PA
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A new shock tube technique has demonstrated the existence of strain rate effects in the plastic deformation of metals. A transient deformation is produced in a thin-walled cylindrical metal tube loaded by a plane air shock wave propagating inside it. Surface strain gauges allow a direct measurement of the shock-produced transient strain. Preliminary experiments with annealed aluminum tubes have demonstrated the existence of strain relaxation when the shock-applied normal surface stress exceeds the static elastic limit. Strain relaxation data from these experiments was used with the quasi-static model developed to describe the deformation of the tube. The experimental and model strain-time profiles compared favorably. Modified author abstract
APPROVED FOR PUBLIC RELEASE