Contact Fatigue Life Analysis Of Rough Surfaces
Author(s)
S. D. Lee, H. J. Chu, Y. J. Cho, H. S Park & H. J. Kim
Abstract
An analytical model to calculate the contact fatigue life of rough surfaces is
presented in this paper. The effect of surface roughness can be calculated using
this model. The computational method and the theoretical basis are also
discussed. Contact stresses are obtained by contact analysis of a semi-infinite
solid based on the use of influence functions; the subsurface stress field is
obtained using rectangular patch solutions. A mesoscopic multiaxial fatigue
criterion which can yield satisfactory results for non-proportional loading is then
applied to predict fatigue damage. A suitable counting method and damage rule
were used to calculate the fatigue life of random loading caused by a rough
surface. As a result of the analysis the relationship between the life and the
roughness as well as the most probable depth of the crack initiation is calculated.
Keywords: contact fatigue, rough surface, life estimation.
1 Introduction
Machine elements such as gears and bearings are subjected to non-conformal
contact where the two bodies initially make contact at a single point or along a
line. Due to the highly concentrated load at a contact area, irreversible
degradation of the surface, e.g. pitting, spalling or flaking, can occur after the
finite number of cycles. These surface degradations are widely known as contact
fatigue.
Keywords
contact fatigue, rough surface, life estimation.
Related Book
Other papers in this volume
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