ANALYSIS ON THE INNER STRESS IN RESIN BASED COMPOSITE

The inner stress in an epoxy adhesive layer deposited on the steel plate at room temperature is studied.With embedded strain gauges in arranged depth of the epoxy layer,the strain changes in the adhesive layer induced by the curing procedure and the changes of environment temperature were measured to evaluate the changes of the inner stress in places during one week.The results from experiment show that the lowest transversal strain is recorded at the layer near the surface,but the highest value is recorded after 24 h.At the point near the interface the stresses are the highest when the curing procedure is about accomplished.The inner stresses in the epoxy adhesive layer during curing to 180 h were estimated based on the strain obtained from the surface of the adhesive layer.