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Optical Engineering

Measurement of J integral by shadow spot generated from out-of-plane displacement
Author(s): Perng-Fei Luo; C.-K. Chuang; Yuh J. Chao
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Paper Abstract

The out-of-plane displacement field at the crack tip region of a compact tension specimen is measured by stereo vision and used to generate a shadow spot on the virtual screen placed behind the specimen by using the mapping equation of reflected caustics. The J values are then computed using the maximum transverse diameter of the generated shadow spot. In the experiment, the in-plane displacement data are also recorded to obtain J measurements along contours surrounding the crack tip. Results indicate that for crack extensions up to 0.275 mm, the J values evaluated using the generated shadow spot are in good agreement with the measurements from the in-plane displacement data and the Merkle-Corten formula. However, the J values obtained using in-plane displacement data are still close to the Merkle-Corten results, even when the crack growth of Δa≈4.0 mm is reached.

Paper Details

Date Published: 1 December 2003
PDF: 10 pages
Opt. Eng. 42(12) doi: 10.1117/1.1622706
Published in: Optical Engineering Volume 42, Issue 12
Show Author Affiliations
Perng-Fei Luo, Chung Hua Polytechnic Institute (Taiwan)
C.-K. Chuang, Chung Hua Univ. (Taiwan)
Yuh J. Chao, Univ. of South Carolina (United States)


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