Gear Micropitting: Model And Validation
Author(s)
J. A. Brand˜ao, J. H.O. Seabra & M. J. D. Castro
Abstract
A numerical model for the prediction of surface initiated damage on gear tooth
flanks (micropitting and mild wear) is presented. This model hinges on a model
of the mixed film lubrication regime and on the application of the Dang Van highcycle
multi-axial fatigue criterion. The numerical model developed was applied to
the prediction of micropitting and mass loss of gear teeth in an actual micropitting
test.
Keywords: gears, surface fatigue, micropitting, numerical model, wear.
1 Introduction
Micropitting is best described as the appearance of minuscule cavities on the surface
of a gear tooth, most often near and bellow the pitch line. They are thought
to be caused by the propagation of micro-cracks originating from the tooth surface
and swiftly reemerging so as to form a pit with a typical depth of 10 μm [1, 2].
Widespread micropitting severely increases the noise level of a gear box, and in
some instances may sufficiently weaken the tooth subsurface for a whole layer to
be removed at once, introducing a shape defect.
Because of the small size of the pits, the crack propagation time is correspondingly
small and the fatigue life is dominated by the initiation time. Additionally,
the fact that the phenomenon remains circumscribed within the first few tens of
micrometres below the tooth surface renders it extremely sensitive to the contact
Keywords
gears, surface fatigue, micropitting, numerical model, wear
Related Book
Other papers in this volume
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