Tricolor photoviscoelastic technique and its application to moving contact

• Published in: Experimental mechanics Vol. 38; no. 3; pp. 211 - 217
• Main Authors: YONEYAMA, S, GOTOH, J, TAKASHI, M
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.09.1998
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Measurement and testing methods; Measurement methods and techniques in continuum mechanics of solids; Physics; Solid mechanics; Structural and continuum mechanics; Constitutive equation; Viscoelasticity; Optical interferometry; White light; Moving contact; Photoelasticity; Mechanical contact; Experimental study; Modeling; Color image; Non proportional load; Deformation measurement; Optical measurement; Contact stress; Testing equipment; Principal stress
• ISSN: 0014-4851; 1741-2765
• DOI: 10.1007/BF02325745

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. Material used is polyurethane rubber.