アルミニウムや超ジュラルミンの超高ひずみ速度特性(S11-4 材料・構造の衝撃工学(4),S11 材料・構造の衝撃工学)

Abstract

Stress-strain curves of commercially pure aluminum (JIS: A1100-H14) and super duralumin (JIS: A2024-T3) are determined in a wide range of strain rates under conditions of uniaxial strain. The plate impact testing is used to obtain stress-strain curves at very high strain rate of ca. 10^6 [1/s] for these materials on the basis of the UWSS (Unsteady Wave Sensing System) using three in-material gauges, e.g., polyvinylidene fluoride (PVDF) gauges or Manganin gauges at impact velocities about 500 to 1000 m/s. Phase velocity associated with stress and phase velocity associated with particle-velocity are determined on considering the effect of thickness of the gauges. For the low strain rate of ca. 1/10^4 [1/s] the stress-strain curves are determined under conditions of uniaxial stress by using an extrapolation procedure. The drop-hammer compression test is used to determine stress-strain curves at medium strain-rate of ca. 10^2 [1/s] under conditions of uniaxial stress by using the extrapolation procedure. It is shown that the stress is independent of strain-rate in a wide range under conditions of uniaxial strain for these light metals.