By R. B. Heywood, D. J. Silverleaf and G. Blackburn (Auth.)
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Extra info for Photoelasticity for Designers
By selecting appropriate thicknesses, the required difference in phase between the two emerging components can be obtained approximately. There are probably many plastics which possess internal stress, or which can be given the required degree of internal stress by prestraining the material. Lee, Meadows and Taylor(451) have made 12 in. square A/4 plates from cellulose acetate sheet, in which the manufacturing processes happened to introduce the correct amount of retardation. The acid test for successful A/4 plates is undoubtedly their stability under laboratory temperatures and humidities.
Three-dimensional effects In a two-dimensional model the relative retardation produced is proportional to the principal stress difference. If the light rays pass through the model in a direction other than the normal, then the retardation produced will be proportional to the secondary principal stresses acting in the plane of the wave front, namely, the components of the principal stresses acting in a direction normal to the propagation of light. 32) For the general three-dimensional case where the three principal stresses vary in magnitude and direction throughout the model, it is necessary to determine the secondary principal stresses acting at points along the light path (taking into account the contribution from all three principal stresses), and the relative retardation can then be assessed from an integration of the difference in the secondary principal stresses acting in the plane of the wave front for the path length.
6. BEHAVIOUR OF LIGHT IN PLANE POLARISCOPE 15 Consequently, by looking through the analyser it should not be possible to see the light source, although slight imperfections in the quality of the polarizers may make the source just visible. The polarizer and analyser are now said to be crossed, with their axes of polarization at right angles to one another, to produce a crossed polariscope. The intensity of light emerging from the analyser depends on the component of incident light which lies in the polarization axis of the analyser.
Photoelasticity for Designers by R. B. Heywood, D. J. Silverleaf and G. Blackburn (Auth.)