Abstract
Dynamic variation of the internal stress distribution in the curing process of epoxy resin is measured for 20 hours immediately after the resin is put into a casting model by using a highly sensitive birefringence measurement system. The direction of the internal stress near the wall of the test cell is parallel to the radial direction, while that around the center is perpendicular to the radial direction. The internal stress with direction parallel to the radial direction results from tensile stress, while that with direction perpendicular to the radial direction results from compressive stress.
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