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A B S T R A C T To understand the different aspects of fatigue behaviour of complex structural joints it will be much helpful if the effects of different parameters are studied separately. In this article, to study the isolated effect of interference fit on fatigue life a pined hole specimen is investigated. This specimen is a single-holed plate with an oversized pin which force fitted to the hole. The investigation was carried out both experimentally and numerically.In the experimental part, interference fitted specimens along with open hole specimens were fatigue tested to study the experimental effect of the interference fit. In the numerical part, three-dimensional finite element (FE) simulations have been performed in order to obtain the created stresses due to interference fit and subsequent applied longitudinal load at the holed plate. The stress distribution obtained from FE simulation around the hole was used to predict crack initiation life using Smith-Watson-Topper method and fatigue crack growth life using the NASGRO equation with applying the AFGROW computer code. The predicted fatigue life obtained from the numerical methods show a good agreement with the experimental fatigue life.Keywords crack growth; fatigue; interference fit; life prediction. N O M E N C L A T U R Eb = fatigue strength exponent c = fatigue ductility exponent d = plate hole nominal diameter da/dN = crack growth rate D = largest diameter of the pins E = elastic modulus f = K op /K max = coefficient (the ratio of crack opening stress intensity factor to maximum stress intensity factor) I = interference fit percent K crit = critical stress intensity factor K max = maximum stress intensity factor K op = crack opening stress intensity factor K σ = stress concentration factor (not theoretical stress concentration factor) La = crack length through the plate thickness La crit = critical crack length through the plate thickness after fracture La i = initial flaw (pre-crack) size through the plate thickness Lc = crack length at the surface of the plate Lc crit = critical crack length at the surface of the plate after fracture Lc i = initial flaw (pre-crack) size at the surface of the plate Correspondence: T. N. Chakherlou.

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