Abstract
Adhesive wear in dry contacts is often described using the Archard or Fleischer model. Both provide equations for the determination of a wear volume, taking the load, the sliding path and a set of material parameters into account. While the Fleischer model is based on energetic approaches, the Archard formulation uses an empirical factor—the wear coefficient—describing the intensity of wear. Today, a numerical determination of the wear coefficient is already possible and both approaches can be deduced to a local accumulation of friction energy. The aim of this work is to enhance existing energy-based wear models into the mixed lubrication regime. Therefore, the pressure distribution within the contact area will be determined numerically taking real surface topographies into account. The emerging contact area will be divided into one part of solid and a second part of elastohydrodynamically lubricated (EHL) contacts. Based on the resulting pressure and shear stress distribution, the formation of micro cracks within the loaded volume will be described. Determining a critical number of load cycles for each asperity, a locally resolved wear coefficient will be derived and the local wear depth calculated.
Highlights
An increased application of low-viscosity lubricants in machine elements increasingly leads to operating conditions in the mixed lubrication lubrication regime regime along along with with the the risk risk for for the the occurrence occurrence of of wear. wear.Since between highly loaded asperities small contact areas form, the material’s yield stress can be reached quickly and micro welds may form form [1].[1]
The wear depth has been determined by calculating a pressure been shown and compared
The wear depth has been determined by calculating a pressure distribution, taking a rough surface geometry into account, and subsequently calculating a locally distribution, taking a rough surface geometry into account, and subsequently calculating a locally
Summary
An increased application of low-viscosity lubricants in machine elements increasingly leads to operating conditions in the mixed lubrication lubrication regime regime along along with with the the risk risk for for the the occurrence occurrence of of wear. wear.Since between highly loaded asperities small contact areas form, the material’s yield stress can be reached quickly and micro welds may form form [1].[1]. An increased application of low-viscosity lubricants in machine elements increasingly leads to operating conditions in the mixed lubrication lubrication regime regime along along with with the the risk risk for for the the occurrence occurrence of of wear. Since between highly loaded asperities small contact areas form, the material’s yield stress can be reached quickly and micro welds may form form [1]. The subsequent separation of surfaces can occur in planes different from the original ones and material can be transferred transferred from from one one body body to to the the other. The asperities are assumed to be subjected to a (local) normal load ffi and anda arelative relativevelocity velocityvrel v
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