純アルミニウムの高速せん断における断熱せん断帯の生成とそれに沿う溶融の発生に関する考察

概要

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Commercial quarter-hard pure aluminum (Al-1/4H) sheets of 10 mm thickness are tested. A circular disk is sheared from a circular specimen concentrically. Clearance between punch and die is 1 and 0.5%. Two testing machines are used, one of which is aided by a drop hammer for high punch speed (10 m/s) and the other, driven by hydraulic pressure for low punch speed (0.1 mm/s). At high-speed shearing, not only the occurrence of the adiabatic shear band (ASB) but also melting along it is clearly demonstrated by measuring the micro-Vicker's hardness distribution over the sheared-off surface, by optical microscopy of the sheared section, which shows a thin layer with a different microstructure from the adjacent smooth shear flow region, by the mirrorlike appearance of the sheared-off surface, and above all, by a theoretical analysis of the shearing process.
社団法人日本機械学会の論文
1992-10-25