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Abstract
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In classical photoelasticity of transparent isotropic materials, the Brewster law states
that the difference in principal refraction index (birefringence) is proportional to the
difference in principal stress. Here we show that such a relation can be generalized to
anisotropic crystals only for the high-symmetry classes of the cubic group
and for a specific plane stress, also for the high-symmetry classes of the
trigonal, tetragonal, and hexagonal groups. No further generalizations are
possible.
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Keywords
photoelasticity, photoelastic constant, anisotropic
crystals, Brewster law, scintillating crystals
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Mathematical Subject Classification 2010
Primary: 78A10, 74F15, 74E10
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Milestones
Received: 30 July 2019
Revised: 4 August 2019
Accepted: 18 January 2020
Published: 11 May 2020
Communicated by Francesco dell'Isola
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