Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing

S. Gondo*, H. Akamine, R. Mitsui, S. Kajino, M. Asakawa, K. Takemoto, K. Tashima, S. Suzuki

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The torsion number of drawn fine high carbon steel wires was measured through torsion testing. The angles between the scratches on the tested wire surface and its longitudinal axis were measured. The shear strain calculated from torsion number γt, shear strain at fractured point γf, and plastic shear strain γpc were evaluated. The following results were obtained. First, the shear strain distribution homogenized; further, torsion number per unit length N, γt, and γpc increased when decreasing the difference between γf and γpc where γpc subtracted from γf (=Δγfpc) > 0. Second, the external factors caused non-uniform shear strain distribution and reduction from the potential maximum shear strain, even for the wire that was hardly affected by the internal factors. The difference of shear strain non-uniformity caused a variation in reduction from the potential maximum shear strain. The internal factors included non-uniform microstructure and existence of inclusions and voids. The external factors were caused by the testing machine and setting of the sample. The potential maximum shear strain was obtained when the effects of internal and external factors were inhibited. Finally, two evaluation methods of the potential maximum shear strain were suggested. One method identifies a sample with a small Δγfpc, and a large γpc where Δγfpc > 0. This sample can be regarded as having the closest strain to the potential maximum shear strain. The other method determines γpc when Δγfpc is closest to 0. This value can be interpreted as plastic strain of the potential maximum shear strain.

本文言語English
ページ(範囲)25-35
ページ数11
ジャーナルExperimental Techniques
45
1
DOI
出版ステータスPublished - 2021 2

ASJC Scopus subject areas

  • 材料力学
  • 機械工学

フィンガープリント

「Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル