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isoclinics

Journal of Mechanics (1)

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An Improved Two-Load Method for Whole-Field Complete Photoelastic Fringe Analysis
T. Y. Chen, H. L. Lee, Y. C. Chou
Journal:

Journal of Mechanics / Volume 21 / Issue 3 / September 2005

Published online by Cambridge University Press:

05 May 2011, pp. 199-203

Print publication:

September 2005
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An improved two-load method for whole-field complete determination of photoelastic parameters is presented. The dark-field isoclinic images are used to determine the isoclinic angles. Using two isoclinic maps obtained from two different loads effectively compensates the indeterminable points. The use of dark-field and light-field photoelastic images for normalization extends the two-load method to analyze dark-field photoelastic fringe patterns and avoids model movement. Larger errors on the determined fringe orders are further reduced by a least-squares quadric fitting. The results are compared well to the theoretical ones. Further comparison of the improved two-load method and the two-wavelength method are given.