Issue 21

D. Croccolo et alii, Frattura ed Integrità Strutturale, 21 (2012) 13-20; DOI: 10.3221/IGF-ESIS.21.02 19 (a) (b) Figure 7 : Stress amplitude diagrams. C ONCLUSIONS n this paper the influence of interference fit coupling on the fatigue strength of holed plates has been investigated both experimentally and numerically. The stress-life curves reported in Fig. 4 highlight a significant difference among the open-hole specimen behaviour and the interference-fit ones. The fatigue strength is always higher when the interference level is higher, anyway since the slopes of the interference fit curves are quite different, the increase of fatigue strength is significant when the remote stress is high; on the opposite the Endurance Limit for both the interference fit levels is quit the same. This event depends on the total stress range, which can be reduced by the interference level up to a minimum value depending on the remote stress; therefore it is not advisable to overcome the interference level, which can guarantee the maximum benefit. I