Accession Number : AD0625468

Title :   AN EXPERIMENTAL INVESTIGATION OF ELASTICPLASTIC PULSE PROPAGATION IN ALUMINUM RODS AT ELEVATED TEMPERATURES.

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING

Personal Author(s) : Bodner,S. R. ; Clifton,R. J.

Report Date : SEP 1965

Pagination or Media Count : 40

Abstract : Experiments are reported involving explosive loading at one end of long, annealed, commercially pure, aluminum rods at temperatures up to 750F. The stress waves are detected by a condenser microphone at the far end of the rod and, in some cases, by strain gages at a cross-section distant from the impact end. The essential features of the recorded velocity-time profiles and strain-time profiles are in agreement with the predictions of a rate independent elastic-plastic theory which takes a Bauschinger effect into account. At room temperature, the reference dynamic stress-strain curve does not differ appreciably from the quasi-static stress-strain curve whereas at elevated temperatures there appears to be a marked difference between the dynamic and quasi-static stress-strain curves. Since the maximum plastic strains are small at cross-sections remote from the impact end the measurements, and consequently the conclusions, are limited to small strains beyond the proportional limit. (Author)

Descriptors :   (*LOADS(FORCES), ALUMINUM), (*MECHANICAL WAVES, PROPAGATION), RODS, PLASTIC PROPERTIES, ELASTIC PROPERTIES, STRESSES, STRAIN(MECHANICS), DEFORMATION, COMPRESSIVE PROPERTIES, HIGH TEMPERATURE

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE