Abstract
The photoelastic response of tinree different epoxy materials was measured. Tensile strips, beams, disks and spheres were loaded and the deformations “frozen in.” Slices from these models were used to calibrate and analyze the absolute retardation of the materials.
It was found that the absolute retardation of light vibrating in a given principal direction was directly proportional to the principal strain in that direction and to the deviatoric components of stress in that direction. This result was a consequence of a unique value of the ratio of the absolute-retardation constants and is contrary to published suggestions that absolute-retardation methods could be used to separate normal stresses in the interior of stress-frozen models.
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Sanford, R.J., Parks, V.J. On the limitations of interferometric methods in three-dimensional photoelasticity. Experimental Mechanics 13, 464–471 (1973). https://doi.org/10.1007/BF02322730
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DOI: https://doi.org/10.1007/BF02322730