Abstract
A new technique for simultaneous determination of both fringe order and principal direction of birefringence in practical photoviscoelastic analysis using white incident light with a set of the primary colors, called tricolor photoviscoelasticity, is described. This method can determine both the fringe order and principal direction of birefringence from a single-color photoviscoelastic image under plane polarization. Then, the authors evaluate time dependent stresses and strains around a contact region in a viscoelastic strip plate under nonproportional loading condition. The variations of the principal stresses and strains are easily obtained over a wide time range by use of the optical constitutive equations of photoviscoelasticity and the characteristic material property functions.
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Yoneyama, S., Gotoh, J. & Takashi, M. Tricolor photoviscoelastic technique and its application to moving contact. Experimental Mechanics 38, 211–217 (1998). https://doi.org/10.1007/BF02325745
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DOI: https://doi.org/10.1007/BF02325745