NDE of a variable-depth crack by photoacoustic imaging

Author

Endoh, H. ; Hiwatashi, Y. ; Hoshimiya, T.

Author_Institution

Dept. of Mech. Eng., Tohoku Gakuin Univ., Tagajo, Japan

Volume

1

fYear

1995

fDate

7-10 Nov 1995

Firstpage

825

Abstract

A new photoacoustic (PA) QNDE scheme based on PA signal dependence on crack depth has been investigated. Two kinds of slit-type simulated cracks, the cross-section of which are a rectangle and an arc, are fabricated on a metal specimen by electrical discharge processing. Imaging of cracks enables precise determination of both the location of edges and the shape of the crack. To verify the PA signal dependence on crack depth, PA imaging of an artificially made vertical crack with linearly increasing depth is performed and the result agrees well with a simple model based on a line heat source along metal walls in the crack

Keywords

crack detection; photoacoustic effect; ultrasonic imaging; ultrasonic materials testing; NDE; arc cross-section crack; artificially made vertical crack; crack depth dependence; crack shape; edge location; electrical discharge processing; line heat source; metal specimen; photoacoustic QNDE scheme; photoacoustic imaging; rectangular cross-section crack; slit-type simulated cracks; variable-depth crack; Aluminum; Argon; Fault location; Frequency; Laser modes; Mechanical engineering; Optical imaging; Optical microscopy; Physics; Shape;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE

Conference_Location

Seattle, WA

ISSN

1051-0117

Print_ISBN

0-7803-2940-6

Type

conf

DOI

10.1109/ULTSYM.1995.495693

Filename

495693