G0401-2-4 薄板の成形性ひずみ測定に及ぼすゲージ長さの影響(材料加工・摩耗)

概要

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A local strain in a sheet metal is usually measured by a deformation of a scribed circle. In such a case, the gage length is the diameter of a scribed circle. A strain is usually measured after a sheet metal is fractured. The measured critical strains of a sheet metal loaded in the uniaxial tension depended much on the gage length, while those in equi-axis tension did a little. Hole extension press tests complement to the critical strain data of uniaxial area, left part of Forming limit diagram (FLD) and Elicsen tests complement to that of equi-axis area, right part of FLD. The critical strains of a plastic-perfect plastic material depend on the strain path. Uniaxial pre tension improves the critical strains on the following equi-axis tension.
一般社団法人日本機械学会の論文
2009-09-12