319 6061-T6 アルミニウム合金の動的変形挙動に及ぼす応力三軸度の影響(OS 材料・構造の動的特性(4))

抄録

In this study, the effect of high strain rate on the stress triaxiality is examined. Tensile tests are performed at three kinds of strain rates (ε=7.2×10^<-4>, 1.0×10^2 and 1.0×10^3 s^<-1>). FEM simulations also reveal the effect of stress triaxiality on the mechanical response under dynamic loading condition. The plastic constraint factors of the round-notched specimen under dynamic loading condition are lower than those under static loading condition. Stress triaxiality is decreased by the reflection of the stress wave near the notch root of the round-notched specimen under dynamic loading condition. The decrease of the stress triaxiality under the dynamic loading condition affects the relaxation of the plastic constraint in the round-notched specimens.