engleski

Novel numerical approach for modelling of subsurface pitting phenomena by phase–field method

Commonly used power transmission machine? elements are gears. Gears in operation are subjected to rolling-sliding contact fatigue under elastohydrodynamic lubrication (EHL) [1]. Common gear fatigue damage mechanisms are divided on pitting and bending in tooth root fatigue. Pitting can be initiated on the surface of the tooth flank and in the subsurface. Surface initiated pitting appears as a consequence of the surface roughness, residual stress, material treatment, etc., while a subsurface pitting appears as a result of a shear stress as a main driving force. In this research, subsurface pitting is considered. The latter mentioned fatigue mechanism is initiated at the location of maximum shear stress in the subsurface and propagates toward the free surface [2]. After reaching the free surface, lubrication fluid enters the crack and accelerates the crack growth toward subsequent free surface. Through years, several investigations in literature have been developed numerical models for predicting subsurface rolling-sliding contact fatigue failure [1-4]. This research presents a novel approach for numerical modelling the subsurface pitting phenomenon by the phase–field method established by Seleš at al [5] implemented into software ABAQUS.

gears, pitting, EHL, phase–field

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