engleski

Numerical modelling of fatigue damage in gears tooth root

Structural components, such as gears, can be subjected to short–time overloads due to dynamically acting loads on gear teeth during torque transmission and because of the other excitations in gearbox that cause additional loads on teeth and leads to low–cycle fatigue damage in material. Although gears are, like most engineering structures, influenced by complex multiaxial stresses that arise from loading and geometry, laboratory fatigue testing very often uses simple specimens that are subjected to uniaxial states of stress. The data recorded through these tests are used for material behaviour estimation of multiaxial non-proportional stress-strain states within the range of elastic-plastic deformations. In this paper the material behaviour in low–cycle fatigue regime is described by complex material model that combines isotropic and kinematic hardening and/or softening with mechanics of material damage to simulate elastic-plastic material behaviour and damage nucleation and accumulation. Chosen material model is implemented into finite element code to enable numerical modelling of material response in gears tooth root, considering stress and strain variation during load cycles as well as damage occurrence and development. Numerical modelling of fatigue damage can provide better fatigue life estimation of gears, focusing on the crack initiation period.

Damage; Gears; Simulation

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