高ひずみ速度領域における銅に対する速度急変実験

抄録

In the previous work, strain rate change tests were conducted for high-purity polycrystalline aluminum at very high strain strain rates. This paper presents the results of reduction tests applied to copper. The experimental apparatus devised in the previous work is used to attain a sufficiently steep reduction in the strain rate. The flow stress obtained from the reduction tests is analyzed by means of the deconvolution method. The results indicate that the instantaneous strain rate plays a more important role than the strain rate history in the dynamic flow stress at a very high strain rate where a steep increase in the strain rate sensitivity of the flow stress is observed. The above-mentioned results are the same as those found in the previous work.