Strengthening of fiber glass reinforced epoxy resin composites by vacuum heat treatment

摘要

Method of improving the shear strength properties of degraded fibrous/resin composites comprising subjecting the composite article to a vacuum heat treatment. The vacuum heat treatment of the degraded composite article regenerates the bond at the fibrous/resin interface, causing a regain in shear strength. The treatment comprises subjecting the composite to a pressure of about 1 millimeter of mercury at a temperature of 300 DEG F (149 DEG C) for 24 hours.