Nondestructive evaluation of a bifurcated crack by means of d. c. potential drop technique using adjacent probes

Masumi Saka, Koichiro Abura, Hiroyuki Abe

研究成果: Article査読

抄録

The d. c. potential drop technique based on the use of adjacent probes is applied to the nondestructive evaluation of a crack bifurcated from a nonplanar crack in a rail. The method of evaluation is based on the measurement of the potential drop on the top surface of the rail. The problem of current flow in a material which contains nonplanar and bifurcated cracks is analyzed numerically using a 3-D finite element method. The relationship between the potential drop on the measured surface and the depth of a bifurcated crack is obtained and it is verified in experiments using rail specimens that the cracks can be characterized quantitatively using the 3-D numerical analysis. It is also shown that the sensitivity of the present method using adjacent probes is higher than that of the conventional method in which the uniform current flow in a region far from the crack is used.

本文言語English
ページ(範囲)352-357
ページ数6
ジャーナルNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
63
606
DOI
出版ステータスPublished - 1997

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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