Design formula for grooved shafts under torsion

Abstract

A design formula has been derived to estimate stress concentration factors of grooved shafts with several kinds of groove shapes. This formula was based on the analytical result for infinitesimal grooves and for finite grooves the experimental values found by the author and others, with the numerical values found by other investigators. Over a wide range of groove sizes, the formula agrees fairly well with the numerical values of Nishitani et al. Comparison with Neuber's formula shows that his formula gives much lower values than the present one, especially for deep grooves.