The compressive behaviour of bonded patch repaired composite laminates is examined. A non-linear stress analysis is performed on a double-lap joint to identify critical joint parameters and design an efficient external patch repair. Then a 3-D finite element analysis is performed to determine the stresses in the optimum repaired configuration and used with a stress failure criterion to predict damage initiation and the ultimate failure load. Experimental measurements show that carefully designed bonded patch repairs can recover almost 80% of the undamaged laminate strength. Non-destructive health monitoring methods are required that continuously inspect for damage development is such repairs.
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