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Experimental Study of Three-Dimensional Identification of Semi-Elliptical Crack on the Back Surface by Means of Direct-Current Electrical Potential Difference Method of Multiple-Point Measurement Type

[+] Author and Article Information
Naoya Tada

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japantada@mech.okayama-u.ac.jp

Makoto Uchida

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japanuchida@mech.okayama-u.ac.jp

Akira Funakoshi

Kobe Shipyard & Machinery Works, Mitsubishi Heavy Industries, Ltd., 1-1 Wadasaki-cho 1-chome, Hyogo-ku, Kobe 652-8585, Japanakira_funakoshi@mhi.co.jp

Hiroki Ishikawa

Hiroshima Machinery Works, Mitsubishi Heavy Industries, Ltd., 6-22 Kannon Shin-machi 4-chome, Nishi-ku, Hiroshima 733-8553, Japanhiroki_ishikawa@mhi.co.jp

J. Pressure Vessel Technol 133(1), 014502 (Jan 20, 2011) (5 pages) doi:10.1115/1.4001918 History: Received April 06, 2009; Revised May 10, 2010; Published January 20, 2011; Online January 20, 2011

A method for identification of a semi-elliptical crack on the back surface of metal plate by means of direct-current electrical potential difference method (DC-PDM) of multiple-point measurement type was proposed by the authors previously. Geometry of the crack was given by the two-dimensional location of the crack center, the surface and inward angles of the crack, and the length and depth of the crack. In this paper, experiments on the crack identification were carried out using six metal plates with different geometries of semi-elliptical cracks made on the back surface by electric discharge machining. Geometrical parameters of the crack were evaluated by the proposed method. The result of identification was successful and it was clarified that the semi-elliptical crack on the back surface can be identified nondestructively by dc-PDM of multiple-point measurement type.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometrical parameters used for identification of semi-elliptical crack on the back surface

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Figure 2

Size and shape of specimens. (a) Specimen 1: θsur=0 deg, θin=0 deg, c=15.0 mm, a=15.0 mm, yc=22.5 mm, and zc=22.5 mm. (b) Specimen 2: θsur=0 deg, θin=30 deg, c=15.0 mm, a=15.0 mm, yc=22.5 mm, and zc=22.5 mm. (c) Specimen 3: θsur=−30 deg, θin=0 deg, c=15.0 mm, a=15.0 mm, yc=22.5 mm, and zc=22.5 mm. (d) Specimen 4: θsur=−30 deg, θin=30 deg, c=15.0 mm, a=15.0 mm, yc=22.5 mm, and zc=22.5 mm. (e) Specimen 5: θsur=0 deg, θin=0 deg, c=25.0 mm, a=15.0 mm, yc=22.5 mm, and zc=22.5 mm. (f) Specimen 6: θsur=0 deg, θin=30 deg, c=15.0 mm, a=20.0 mm, yc=22.5 mm, and zc=22.5 mm.

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Figure 3

Location of rectangular grid on the surface and that of semi-elliptical crack on the back surface

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Figure 4

Apparatus for measurement of potential difference on the surface of the specimen

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Figure 5

Fixed and movable probes for evaluation of potential difference

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Figure 6

Distribution of the normalized potential difference of probe pairs for specimens 1–6 in the first trial

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