ねじり衝撃下におけるアルミニウムおよび4340鋼相当材のせん断強度のひずみ速度依存性

概要

論文の詳細を見る
The effect of strain rate on the shear strength of a commercial pure aluminum and alloys similar to 4340 steel (high strength materials of four kinds) was examined by the torsional split Hopkinson bar method using a combined tension-torsion impact testing apparatus. It was clarified for aluminum that the effect of strain rate on the strength was not distinct at small strain, but became more conspicuous at larger strain. For high strength materials, such as alloys similar to 4340 steel, the shear strength also depended on the shear strain rate. The yield stress at a high strain rate was higher than that at a low strain rate, and the slope of the tangent to tile dynamic stress-strain curve in the plastic region at a constant strain rate had a tendency to become gentler as tile Strain rate became higher. The practical constitutive equation for an elastic/viscoplastic body proposed by one of the authors was applicable to these tested materials. .
1984-02-15