Generation of internal stress in the process of solidification of synthetic resin, I : internal stress caused by contraction

Abstract

When casting resin is cured, the volume contraction takes place from the bridge forming reaction and cooling. When the contraction is caused being free from restraint, the internal stress will not originate, but if geometrically restrained, it will originate. In this report, the relation between the free contraction during the curing process and the internal stress caused by the geometrical restraint is studied on the casting type epoxy resin, and the behavior of the resin related to the cause for the origination of internal stress is considered.