An extensive test program was conducted on countersunk riveted-lap-joint panels with or without stiffeners exposed to either laboratory air or to a corrosive salt-water environment. Tests were conducted under constant-amplitude loading, which simulated aircraft fuselage skin stresses. For the corrosive environment, the panels were immersed in a 3.5 % NaCI solution. Using the remote stress, by-pass stress, secondary bending stress, and an EIFS (equivalent-initial-flaw-size), the fatigue lives and some fatigue-crack-growth behaviour were calculated and compared with the test data. Fatigue lives were calculated using small-crack theory. The fracture-mechanics based calculations assumed an initial 6-micron corner crack at the edge of a straight-shank, critically loaded fastener hole (rivet clamp-up and interference-fit stresses were neglected). Calculations for air and salt-water environments were in good agreement (less than a factor of 2) with the test results. The 6-micron radius EIFS is consistent with laboratory observations at crack-initiation sites in fatigue test coupons exposed to air and salt water. This paper shows that an 'engineering approach' accurately predicts fatigue (and crack-growth) lives of riveted lap-joint panels tested under an aggressive environment.
Fatigue-life analysis of riveted-lap-joint panels under ambient and salt-water conditions
Symposium on Structural Durability, 1 ; 253-269
2005
17 Seiten, 12 Bilder, 26 Quellen
Conference paper
English
A fatigue life analysis method for multiple riveted joint
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