Analysis of Interaction of Multiple Cracks in a Direct Current Field and Nondestructive Evaluation

[+] Author and Article Information
H. Liu

Tohoku University, Aoba, Armaki, Aoba-Ku, Sendai 980-8579, Japan

M. Saka

Department of Mechanical Engineering, Tohoku University, Aoba, Armaki, Aoba-Ku, Sendai 980-8579, Japan

H. Abe'

Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

I. Komura

Heavy Apparatus Engineering Laboratory, Toshiba Corporation, 1-9 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan

H. Sakamoto

Isogo Nuclear Engineering Center, Toshiba Corporation, 8 Shinsugita-cho, Isogo-ku, Yokohama 235-0032, Japan

J. Appl. Mech 66(2), 468-475 (Oct 25, 1999) (7 pages) doi:10.1115/1.2791071 History: Received April 03, 1997; Revised August 13, 1998


A method of analysis is proposed for nondestructive evaluation of multiple cracks by means of the d.c. (direct current) potential drop technique. Two and three-dimensional multiple cracks are treated. A methodology for considering interaction of cracks based on the equation for an isolated crack is given to calculate the potential drop between both sides of a crack in multiple cracking in a plate. The inverse problem to evaluate the crack depth is analyzed by comparing the potential drop calculated in this way with the measurement. It is shown that the evaluated crack depth is in good agreement with the actual one.

COPYRIGHT © 1999 by The American Society of Mechanical Engineers
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