F-111C Lower Wing Skin Bonded Composite Repair Substantiation Testing.
DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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Experimental testing was undertaken to verify a bonded composite repair to a crack in the primary structure of a F-111C aircraft of the Royal Australian Air Force. The flight safety was compromised by a crack in the lower wing skin reducing the structure residual strength below the Design Limit level. Two levels of representative specimens were designed to incorporate the complex local geometry in the lower wing skin. They were tested in several configurations ambient, high and low temperature under static and cyclic loads with, and without, repaired cracks. Extensive strain survey data was obtained for both types of specimens and their static residual strength was shown to be restored by the repair. Cyclic loading tests of specimens with the repair also demonstrated good durability and damage tolerance, with crack growth data providing a recommended inspection interval for remaining aircraft
- Attack and Fighter Aircraft