Abstract: This study presents the effect of cure and post-cure on mechanical properties of random chopped e-Glass, carbon fiber reinforced epoxy composites. At first, 2 mm fibers reinforced epoxy matrix of dog-bond specimens cure for 12 h at room temperature 25°C and post cure for 12 h at 50 and 100°C temperatures for all specimens a fragmentation tensile test where used, the strain energy release rate was calculated at cure and post cure temperatures, the strain energy release rate increase as post cure temperature increase.