Uniaxial and Biaxial Tests on Riveted Fuselage Lap Joint Specimens

摘要

As a part of a collaboration program between the Federal Aviation Administration211u001e(FAA, USA) and the Department of Civil Aviation (RLD, the Netherlands), the Dutch 211u001eNational Aerospace Laboratory (NLR) has carried out fatigue tests on riveted lap 211u001ejoint specimens. The specimens are representative of the longitudinal lap joints 211u001eof a commercial aircraft in which multiple-site damage (MSD) was found in 211u001eservice. Two different rivet configurations, dimpled and countersunk riveted 211u001ejoints, were investigated. The countersunk rivited specimens were bonded as well. 211u001eFour different bonding qualities ranging from fully bonded to fully unbonded were 211u001etested. The results of the test program showed that the fatigue life until 211u001efailure of the dimpled lap joint specimens was about one-quarter of that of the 211u001eunbonded countersunk specimens. The bonding quality is a major parameter for the 211u001efatigue life. Fully or partly bonded specimens did not show fatigue cracking 211u001ewithin 500 or even 1000 kilocycles. Specimens with a fully degraded bonding layer 211u001ehave slightly better fatigue properties compared to fully unbonded specimens.