高ひずみ速度域におけるアルミニウム合金6061-0材の変形応力のひずみ速度依存性(S11-1 材料・構造の衝撃工学(1),S11 材料・構造の衝撃工学)

Abstract

Strain rate sensitivity in FCC metals is known to increase dramatically when the strain rate exceeds about 5×10^3/s. In order to evaluate the strain rate sensitivity of a dynamic flow stress of aluminium alloy at very high strain rates, constant strain rate tests and strain rate reduction tests are conducted for AA6061-O in a strain rate range from about 1×10^3/s to 3×10^4/s. The flow stress increases linearly with increasing strain rate itself and the instantaneous strain rate plays a dominant role in the flow stress at very high strain rates. An effect of alloying is to increase an internal stress and to decrease somewhat a instantaneous strain rate sensitivity.