The main objective of this study is to use the shot peening treatment to control and optimize the roughness with regard to the micropitting damage of gear tooth flanks. To achieve this objective, the approach adopted in this study is based on comparative analyses between the calculations of sensitivity to micropitting and results of experimental tests (two-disk Rolling-Sliding Contact Fatigue, RSCF, test methodology). Different types and characteristics of treatment by shot peening are examined (shot properties: size of shot particles, coverage, etc). The work carried out in this study is based on the development of an interrupted test method to monitor the micropitting progression with the development of a specific image analysis method for quantification of this flank damage through the percentage of the affected area. A detailed analysis was conducted to follow during testing the evolution of the parameters characterizing the surface topography conditions. By examining the obtained results, a particular type of shot peening has been identified as improving the contact fatigue strength of gear teeth.
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