Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495693
