Application of Determination of Principal-Stress Directions by Color Phase Shifting Technique to Model Containing Isotropic Points

Pichet Pinit; Eisaku Umezaki

doi:10.4028/www.scientific.net/KEM.326-328.75

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 326-328Application of Determination of Principal-Stress...

Application of Determination of Principal-Stress Directions by Color Phase Shifting Technique to Model Containing Isotropic Points

Abstract:

This paper presents an application of a new point-wise technique for unwrapping the isoclinic parameter determined by a four-step color phase shifting. The unwrapping technique is based on a largest region in a binary image that corresponds to a largest visible-wrapped period of the computed isoclinic parameter. The largest region is obtained using an intersection operation between the extended ranges of the computed isoclinic parameter. The method uses four raw photoelastic fringe images. The technique is applied to a circular ring containing isotropic points subjected to diametral compression. Results show the method provides the correct isoclinic parameter in the true interval over the entire domain.

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Periodical:

Key Engineering Materials (Volumes 326-328)

Pages:

75-78

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.326-328.75

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Online since:

December 2006

Authors:

Pichet Pinit, Eisaku Umezaki

Keywords:

Color Phase Shifting, Dark-Field Plane Polariscope, Isoclinic Parameter, Isotropic Point, Phase Unwrapping, Photoelasticity, Principal-Stress Directions

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References

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[5] M.M. Frocht: Photoelasticity, Vol. 1 (John Wiley & Son, 1941). Fig. 2. Maps of φw and two binary images: (a) map of φw in interval [0, +π/2]. (b) map of φw in interval (−π/8, +π/8]. (c) map of φw in interval (−π/4, +π/4]. (d) LmROCIP. (e) LROCIIP. (a) (b) (c) (d) Fig. 3. Complete map of unwrapped isoclinic angle φu in interval (−π/2, +π/2]. (e).

DOI: 10.54859/kjogi108576-65476

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