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Title: Measurement of Y-notch tip plastic zone by the laser speckle technique
Authors: Tay, C.J. 
Tay, T.E. 
Shang, H.M. 
Keywords: Laser speckle
Metallic materials
Plastic zone
Issue Date: Aug-1996
Citation: Tay, C.J.,Tay, T.E.,Shang, H.M. (1996-08). Measurement of Y-notch tip plastic zone by the laser speckle technique. Strain 32 (3) : 87-90. ScholarBank@NUS Repository.
Abstract: This paper presents a laser speckle method for the measurement of plastic zone ahead of a Y-notch tip on metallic specimens. The method employs an unexpanded laser beam to illuminate the test object. Diffracted images are captured on a ground glass and recorded using a CCD camera. The recorded images were digitised and subsequently analysed on a personal computer. The plastic strain at the notch tip was correlated with its corresponding speckle image using a recently proposed parameter known as the integrated peak spectral intensity coefficient. Specimens containing Y-notches of various angles were tested and the results compared well with that predicted by theory.
Source Title: Strain
ISSN: 00392103
Appears in Collections:Staff Publications

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