Abstract
The keyway is a widely employed solution to link a hub with a shaft. This paper underlines the importance of the fillet radius at the keyway base, highlights the combined effect between bending and torsion and verifies the stress concentration factors present in the literature thanks to Finite Element Method. Starting from a first analytical analysis of the shaft, a series of FE analyses were carried out with the aim of understanding why certain shaft failures occurred. In these analyses, the key presence is considered and the torque is transmitted through it. The analysis reveals that standard verification could fail for some configurations and for the precise evaluation of the fatigue behaviour, for this reason a numerical model is always suggested.
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