This paper deals with the influence of interference fit coupling on the fatigue strength
of holed plates. The effect was investigated both experimentally and numerically.
Axial fatigue tests have been carried out on holed specimens made of high performance
steel (1075MPa of Ultimate strength and 990MPa of Yield strength) with or without
a pin, made of the same material, press fitted into their central hole. Three different
conditions have been investigated: free hole specimens, specimens with 0.6% of nominal
specific interference and specimens with 2% of nominal specific interference. The
experimental stress-life (S–N) curves pointed out an increased fatigue life of the
interference fit specimens compared with the free hole ones. The numerical investigation
was performed in order to analyse the stress fields by applying an elastic plastic
2D simulation with a commercial Finite Element software. The stress history and distribution
along the contact interference of the fitted samples indicates a significant reduction
of the local stress range due to the externally applied loading (remote stress) since
a residual and compressive stress field is generated by the pin insertion.