A Generalization Method for Assignment of Isochromatic Fringe Order Using Structure Driven-Type Image Processing

This paper describes a generalization method and the ability to determine the isochromatic fringe order more accurately over the entire region of a 2-dimensional photoelastic model. The isocromatic fringes measured under various conditions were automatically extracted as the extreme points of "...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series A Vol. 55; no. 511; pp. 598 - 607
Main Authors MAWATARI, Shizuo, TAKASHI, Masahisa, TOYODA, Yoshiaki
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 1989
Subjects
Experimental Stress Analysis
Image Processing
Isochromatic Fringe
Multidimensional Unfolding
Photoelasticity
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Summary:This paper describes a generalization method and the ability to determine the isochromatic fringe order more accurately over the entire region of a 2-dimensional photoelastic model. The isocromatic fringes measured under various conditions were automatically extracted as the extreme points of "smoothing spline functions" using a microcomputer. By utilizing the well-known formula for the light intensity of a beam, the accurate fringe order, which varies continuously between the adjacent fringes, was automatically determined. Then by applying the concept of multidimensional unfolding, the specific fringe order distribution obtained was successfully adjusted and generalized, taking the variation of test conditions into consideration. The values of the principal stress difference computed numerically by this method were compared with theoretical values and a close similarity was observed.
ISSN:0387-5008
1884-8338
DOI:10.1299/kikaia.55.598