Uniaxial and Biaxial Tests on Riveted Fuselage Lap Joint Specimens.
NATIONAL AEROSPACE LAB AMSTERDAM (NETHERLANDS)
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As a part of a collaboration program between the Federal Aviation Administration FAA. USA and the Department of Civil Aviation RLD, the Netherlands, the Dutch National Aerospace Laboratory NLR has carried out fatigue tests on riveted lap joint specimens. The specimens are representative of the longitudinal lap joints of a commercial aircraft in which multiple-site damage MSD was found in service. Two different rivet configurations. dimpled and countersunk riveted joints, were investigated. The countersunk riveted specimens were bonded as well. Four different bonding qualities ranging from fully bonded to fully unbonded were tested. The results of the test program showed that the fatigue life until failure of the dimpled lap joint specimens was about one-quarter of that of the unbonded countersunk specimens. The bonding quality is a major parameter for the fatigue life. Fully or partly bonded specimens did not show fatigue cracking within 500 or even 1000 kilocycles. Specimens with a fully degraded bonding layer have slightly better fatigue properties compared to fully unbonded specimens.
- Couplers, Fasteners and Joints
- Test Facilities, Equipment and Methods