Photoelasticity. Proceedings of the International Symposium by M. M. Frocht

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By M. M. Frocht

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Additional resources for Photoelasticity. Proceedings of the International Symposium Held at Illinois Institute of Technology, Chicago, Illinois, October 1961

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POST, D . "Isochromatic Fringe Sharpening and Fringe Multiplication in Photoelasticity", Proc. Soc. Exp. Stress Anal, Vol. XII, No. 2, p. 143, 1955. 19. POST, D . "Multiple Beam Fringe Sharpening with the Series Interferometer", / . Opt. Soc. , Vol. 48, No. 5, p. 309, 1958. 4 AN EXPERIMENTAL STUDY ON THE EFFECTS OF THE THICKNESS OF BIREFRINGENT COATINGS* J. DUFFYt AND C. A. A. Summary—Results are presented of an experimental study of the ability of biréfringent coatings to provide an accurate measure of surface strains in the presence both of sharp gradients and of changes in the curvature of the metal surface under load.

HILTSCHER At/At0 to reach a constant value for the state of plane strain which was stated in the foregoing section (Figs. 7 and 8) is not noticeable for values t/r = 3 reached in this test. From the diagrams of Fig. 11 one may also determine at what distance from grooves lateral extensometer measurements are permissible in regard to the required accuracy. For special cases an investigation like this may become necessary. 3. EXAMPLES OF PRACTICAL INVESTIGATIONS Since the method is simple and at the same time very accurate, it has already been applied to many practical and important investigations.

Ll. tj' 5mm t2~ 10 mm f,= 15 mm b m 120mm A Γ) - 5mm \ r5 = 15mm h=5mm ΓΤΓΤΤΤΤΤΤΤΤ O-ref. FIG. 9. Models for investigation of three-dimensional stress near grooves in uniaxial tension. 5 10 mm Model thickness t 15 FIG. 10. Relative fringe order and relative change in thickness in the boundary of the grooves from Fig. 9. 95 I 090 FIG. 75 11. Deviation of At from AtQ (plane stress) in the neighborhood of grooves of different radius and depth. with the tendency to reach a constant value for plane strain.

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