610 鋼材及び軽金属の衝撃加速・減速引張試験

概要

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In order to investigate the effect of strain rate change during dynamic tensile tests on the stress-strain curves, an analytical study using the maximum load condition and a simple power law, σ=Bε''・ε^^・^m (ε^^・ : true strain rate, B, n, m : constants) as a constitutive equation was carried out. Three kinds of loading pulse, i.e. a usual constant incident pulse, an acceleration pulse and a deceleration pulse, were considered. It was found that the instability strain increases with the increase of acceleration parameter of loading pulses and the strain rate sensitivity parameter of specimen materials. To check these analytical results, a series of dynamic tensile test for A2024-T6 aluminum alloy, S45C steel and AZ31 magnesium alloy using Hopkinson bar apparatus was performed with the three types of loading pulse. The experimental results agreed well with that predicted by the analysis.
一般社団法人日本機械学会の論文
2002-10-05