Fretting fatigue of rough surfaces

This paper presents a numerical model that maps the evolution of fretting fatigue life of Hertzian rough contacting bodies in fretting wear. Effect of surface roughness parameters (i.e. root mean square, skewness and orientation) on fretting fatigue life is reported. Fretting fatigue life is calculated as the crack initiation period predicted by the Smith Watson Topper multiaxial fatigue theory. Fretting wear is also accommodated in the analysis and is calculated by local application of Archard's wear law. The results from this investigation indicate that wear initially improves resistance to fatigue cracking, and reduces fatigue life as it becomes dominant. The approach developed in this study allows for implementation of real rough surfaces and study the effects of various statistical surface properties on fretting fatigue life. The presence of surface roughness in the analytical model reduces predicted fatigue life significantly. Other statistical surface parameters such as skewness and orientation also have a major impact on fretting fatigue life calculations.

[1]  K. N. Smith A Stress-Strain Function for the Fatigue of Metals , 1970 .

[2]  Sean B. Leen,et al.  Contact-evolution based prediction of fretting fatigue life: Effect of slip amplitude , 2007 .

[3]  M. Ciavarella The generalized Cattaneo partial slip plane contact problem. I—Theory , 1998 .

[4]  V. G. Rekach Manual of the Theory of Elasticity , 1979 .

[5]  J. Jäger,et al.  A new principle in contact mechanics , 1998 .

[6]  I. F. Stowers,et al.  The Mechanism of Fretting Wear , 1973 .

[7]  T. Farris,et al.  Wear in Partial Slip Contact , 2001 .

[8]  Farshid Sadeghi,et al.  Analysis of EHL Circular Contact Start Up: Part I—Mixed Contact Model With Pressure and Film Thickness Results , 2001 .

[9]  Staffan Söderberg,et al.  On fretting maps , 1988 .

[10]  L. Johansson,et al.  Numerical Simulation of Contact Pressure Evolution in Fretting , 1994 .

[11]  Takahisa Kato,et al.  An FFT-Based Method for Rough Surface Contact , 1997 .

[12]  T. Farris,et al.  Mechanics of fretting fatigue crack formation , 1995 .

[13]  Farshid Sadeghi,et al.  Modeling of fretting wear evolution in rough circular contacts in partial slip , 2007 .

[14]  Sean B. Leen,et al.  The effect of slip regime on fretting wear-induced stress evolution , 2004 .

[15]  S. Fouvry,et al.  A fretting crack initiation prediction taking into account the surface roughness and the crack nucleation process volume , 2005, 0710.3715.

[16]  Michele Ciavarella,et al.  Brief note: Some observations on oscillating tangential forces and wear in general plane contacts , 1999 .