The pressure angle effects of spur gears on stress concentration factor

Abstract

PurposeThe purpose of this paper is to investigate the effect of pressure angle, and module of spur gear teeth on stress concentration factor, using photoelasticity method, and numerical MSC/NASTRAN finite element package.Design/methodology/approachThe stress concentration factor is determined as a ratio between maximum stress (determined in the fillet radius by photoelastic and finite element methods), and nominal stress (calculated by a common standard formulas). In order to specify the geometric parameters (height and thickness) of gears, both standard Deutsches Institut für Normung (DIN)/Japanese Gear Manufactures Association (JGMA), and five other non‐standard approaches are used.FindingsThe results show that the stress concentration factor increases by decreasing the pressure angle. In addition, the values which are obtained by finite element analyses exhibit more uniformity than photoelastic method.Practical implicationsAn accurate determination of stress concentration factors will limit both over and under design of the gears.Originality/valueThe results show that one of the suggested non‐standard approaches gives the highest stress concentration factor than the standard approaches.