Author(s)

M.A. da Fonte & M.M. de Freitas

Abstract

Many power transmission devices run under load bending combined with steady torsion. After crack initiation the crack front profile usually grows with a semi- elliptical surface shape. During the rotation of a shaft, the crack growth of a semi-elliptical surface crack depends on the two crack angular positions: one is when the load bending direction is perpendicular to semi-elliptical crack front profile; another one is an oblique position whenever one of two external points are on the load bending direction. The present study is based on 3D finite elements in order to obtain Stress Intensity Factors (SIF) for semi-elliptical surface cracks, taking into account the two critical angular positions of the crack front when a round bar or a shaft rotate in operatin

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