Accession Number : ADA324095

Title :   F-111C Lower Wing Skin Bonded Composite Repair Substantiation Testing.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Boykett, R. ; Walker, K.

PDF Url : ADA324095

Report Date : NOV 1996

Pagination or Media Count : 80

Abstract : 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

Descriptors :   *CRACK PROPAGATION, *JET FIGHTERS, *WINGS, LOW TEMPERATURE, AIR FORCE, DAMAGE, COMPOSITE MATERIALS, HIGH TEMPERATURE, LOADS(FORCES), STRENGTH(MECHANICS), REPAIR, RESIDUALS, INSPECTION, TOLERANCE, GEOMETRY, BONDING, AUSTRALIA, STATICS, CYCLIC LOADS, CYCLIC TESTS, INTERVALS.

Subject Categories : Attack and Fighter Aircraft
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE