Fatigue Analysis of Interference Fit
Al 2024-T3 Specimens
Fatigue failure of interference-fit aluminum joints has been investigated
by testing several specimens geometries, conducting numerical simulations
and using multiaxial fatigue theories. The experiments included center crack,
edge crack and uncracked specimens, fitted with a zero load-transfer interference-fit
fasteners and tested to failure at different cyclic loads. Thermal imaging
system was used to observe initiation of cracks during the fatigue tests.
This has shown promising prospects for an early detection of small surface
An elastic-plastic contact finite element (EPFE) analysis was carried out
to simulate the local combined interference and cyclic stress distribution
in the specimens near the fastener's hole. The simulation and test results
were used in a multiaxial fatigue analysis that examined several theories
including the critical plane approach and the octahedral stress parameter.
The experimental lives were correlated by calculating the multiaxial fatigue
parameters at different locations along the hole edge.