Abstract
In order to study the strength of metals under an explosive load, the measuring method with a newly devised apparatus was investigated. The results of the explosive tensile tests on 0.5% carbon steel and 6/4 brass specimens by the apparatus were discussed.
This tensile test apparatus is designed to impart a direct explosive power to a specimen through two pistons. The tensile acceleration was measured by a piezo-electric accelerometer, and the acceleration and stress measured by the load cell were simultaneously recorded by a dual beam synchroscope. From a numerical integration of the acceleration, the strain-rate and elongation were culuculated.
The variations in stress, strain, strain-rate and elongation during the explosive tensile tests were examined with a static curve. The results are summarized as follws:
(1) Since the response to an acceleration measurement and its integration are more sensitive and accurate than that to a direct measurement of elongations, present method is considered to be suitable for analyzing the impact elongation of a specimen.
(2) The yield stress, maximum stress and elongation were larger than those obtained by the static test, the details of which were investigated by the stress-acceleration-time cuve and the dynamic stress-strain curve.
