P S Theocaris et al 1975 J. Phys. E: Sci. Instrum. 8 611 doi:10.1088/0022-3735/8/7/022
P S Theocaris, G B Philis and C H Blontzou
Show affiliationsA method for measurement of refractive index and birefringence of transparent solids during transient and dynamic mechanical tests is presented. The method of is based on interferometric measurement of the retardation of light travelling through the specimen under two different incidence angles. In addition, thickness variation during deformation-leading to Poisson's ratio under certain conditions-can be calculated. The method was applied to polymethylmethacrylate and polycarbonate samples subjected to uniaxial tension.
81.70.Fy Nondestructive testing: optical methods
81.70.Bt Mechanical testing, impact tests, static and dynamic loads
Condensed matter: electrical, magnetic and optical
Issue 7 (July 1975)
P S Theocaris et al 1975 J. Phys. E: Sci. Instrum. 8 611
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