کلیدواژهها
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Fatigue,
Interference fit,
Bolt clamping,
Double shear lap joint,
Finite element
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چکیده
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Two applied fatigue life improvement techniques of joints, interference fitting and bolt clamping, have
been investigated comparing available experimental and finite element simulation results for Al-alloy
2024-T3 double shear lap joint specimens. Fatigue test results of interference fitted, bolt clamped and
combined interference fitted-bolt clamped specimens were used to determine the effect of the different
techniques on the fatigue life improvement in comparison with clearance fitted specimens. Also the
fracture surfaces of the specimens were analyzed post-mortem to determine the fatigue crack initiation
(and growth) locations. These locations were correlated to the applied cyclic load range. Results of the
finite element analysis were used to help explain the trends observed in the experimentally obtained S-N
data. Results showed that the fatigue life improvement not only changes for different techniques and
magnitude of interference fit or tightening torque, but also depends on the applied cyclic load range.
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