Abstract
The stress risen in solidification process of epoxy resin is investigated experimentally and analytically. The process is divided into curing process and thermal process after curing. In the first process the resin is changed to solid state from liquid state and internal stress is risen by volumetric change in the phase transition as well as change of mechanical properties. In the sccond process solidified resin suffers heat treatment and residual stress remains due to thermal shrinkage and viscoelastic effect.
The volumetric change and the elastic constant during phase transition process are experimentally measured by dilatometer and torsional blade analysis and the results are formulated by using viscoelastic models. The internal stress and the deformed state of the cured resin in hollow of plate are analyzed on the basis of the formulated results. The analyzed deformed state coincides approximately with the experimental state.
The thermal deformation and the viscoelastic properties of solidified resin under various temperature conditions are experimentally investigated by thermal tests and creep tests. The formulated results are applied for the analysis of residual stress of resin block contained metal plate under various thermal histories. The analyzed results fit for the experimental values qualitatevely.
