کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
780932 | 1463785 | 2013 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A physics-based model to predict micro-pitting lives of lubricated point contacts A physics-based model to predict micro-pitting lives of lubricated point contacts](/preview/png/780932.png)
This paper proposes a physics-based model to predict the onset of micro-pit formation for lubricated point contacts of rough surfaces. A mixed elastohydrodynamic lubrication model is employed to predict the surface normal and tangential tractions for a stress prediction model to determine the resultant stress histories. The boundary element approach is used in the stress model to fully capture the measured three-dimensional topographies of the contacting rough surfaces, allowing an accurate prediction of the localized stress concentrations that dictate the occurrence of micro-pits. In the process, the method of coordinate transformation and the indirect approach of rigid body motion are devised to eliminate the kernel singularities. A novel numerical procedure is also developed to minimize any Gaussian quadrature numerical error in the integration of the near singular kernels. The fatigue damage is then evaluated employing a multi-axial fatigue criterion. The proposed micro-pitting life prediction methodology is demonstrated using an example ball-on-disk contact problem.
► A mixed EHL model to predict surface tractions.
► A novel stress model to predict stress fields, incorporating roughness geometry.
► A multi-axial fatigue model to assess the fatigue damage.
► Ball-on-disk contact problem to show model capabilities.
Journal: International Journal of Fatigue - Volume 47, February 2013, Pages 205–215