Creep analysis in two functionally graded rotating gears

Spur gears are one of the mechanical structures which widely used in power transmission. They are used to control the speed or change the direction of a power resource. The gears generally fail when creep impacts increases . In practice, most gear teeth break due to surface contact, specially magnifying the high stress concentration on the contact tooth surface. Selecting the suitable material for a gear tooth is of high importance for operating gear system. Utilizing functionally graded material (FGM) can boost up the root strength of tooth and life of the gear manufacturing; therefore, this paper aims to study the effect of functionally graded material layer toward the radial direction in spur gears under in rotating load. Various Young’s modulus variation functions and Poisson constant coefficient are used. The subroutine UMAT Abaque has been applied to study the creep behavior in two rotating gears. The effects of material equation and the speed of rotation between gears on the creep behavior have been investigated. According to the results of simulations, the Al–TiB FGM had minimum creep deflection, which was analysis in details with considering the variation of strain, stress and displacement.