Stress concentration factor of a shaft with a circumferential groove in torsion (3rd report, Design formula)

Abstract

A design formula has been derived to obtain stress concentration factors of grooved shafts with several kinds of groove shapes in this investigation. This formula was derived based on the analytical result for infinitesimal grooves and experimental values of the author et al., and numerical values of other investigators for finite grooves. The formula agreed fairly well with the numerical values of Nishitani et al. for a wide range of groove sizes. A comparison with Neuber's formula showed that Neuber's formula gives much lower values than the present one, especially for deep grooves.