14 – Fatigue Wear
01 Jan 2006-pp 595-619
TL;DR: In this paper, the fundamental characteristics of fatigue wear and ways of controlling it are discussed in sliding and rolling contacts and a consistent pattern of events relating to subsurface plastic deformation, crack formation and subsequent release of wear debris is evident.
Abstract: Publisher Summary
The fundamental characteristics of fatigue wear and ways of controlling it are discussed in this chapter. During sliding a consistent pattern of events relating to subsurface plastic deformation, crack formation and subsequent release of wear debris is evident. The role of material properties in determining wear rates involves factors influencing crack initiation and propagation. A material with the minimum of microscopic flaws and inclusions will usually give low fatigue wear rates. The lack of relative motion among contacting asperities in rolling contacts ensures that wear during rolling is relatively slow compared to sliding wear. Wear under dry rolling is sufficiently slow to allow many mechanical components to operate without lubrication or other forms of wear protection for a certain limited period of time. The application of lubrication further reduces the level of wear during rolling, so that a considerable period of rolling must elapse before the first wear particle is produced. Fatigue-based wear is inevitable for all sliding and rolling contacts so that the onset of delamination or spalling could be considered as an acceptable limit to the working life of the component provided that only gradual failure occurs.
Citations
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TL;DR: In this article, 3D printing was used to fabricate porous polycarbonate-urethane (PCU) and ultra-high-molecular-weight polyethylene (UHMWPE) blend for the artificial meniscus to enable native lubrication mechanisms of the knee.
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TL;DR: In this paper, a fatigue wear model of plane sliding pairs under dry friction is presented, which describes the quantitative relationship between the wear behaviors of the plane sliding pair and the main factors including the load and sliding speed, material property, friction property, and surface topography.
Abstract: Wear modeling is essential to predict and improve wear resistance of machine parts. This article presents a fatigue wear model of plane sliding pairs under dry friction. The wear model is constructed through developing a dynamic contact model of surfaces and proposing a mean fatigue damage constant of asperities. It is simpler and more practical than existing fatigue wear models because it describes the quantitative relationship between the wear behaviors of the plane sliding pairs and the main factors including the load and sliding speed, material property, friction property, and surface topography of the pairs. Furthermore, the wear model can predict the wear of each component of the sliding pairs. Reasonability and applicability of the wear model are validated via pin-on-disc wear tests. The wear model is applicable to predict the wear of the plane sliding pairs, which is characterized by friction fatigue of contact surfaces. The wear model can also be used to guide the tribological design of sliding p...
24 citations
TL;DR: In this article, a dynamic contact model of sliding rough surfaces is proposed based on the characterization of the contact asperities on rough surfaces, which can provide the theoretical basis for analyzing the microscopic damage of surfaces in wear process and constructing the analytical wear model to predict wear.
Abstract: Dynamic contact model of rough surfaces can provide the theoretical basis for analyzing the microscopic damage of surfaces in wear process and constructing the analytical wear model to predict wear. A dynamic contact model of sliding rough surfaces is innovatively constructed based on the characterization of the contact asperities on rough surfaces in this paper. Firstly, an asperity model of rough surface is set up according to the surface topography parameters and the static contact parameters is evaluated in the light of statistics contact theory; Then the contact characteristic of surface topography in sliding is analyzed and a series of equivalent contact models are proposed; Finally, the dynamic contact model of rough surfaces is established and from which the dynamic contact parameter of rough surfaces is formulated. The dynamic contact model can be further improved to analyze the friction fatigue wear of sliding pairs and provide reference for tribology design of mechanical surfaces.
References
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01 Jan 1973TL;DR: A new theory for wear of metals is considered in this article, which is based on the behavior of dislocations at the surface, sub-surface crack and void formation, and subsequent joining of cracks by shear deformation of the surface.
Abstract: A new theory for wear of metals is considered. The theory is based on the behavior of dislocations at the surface, sub-surface crack and void formation, and subsequent joining of cracks by shear deformation of the surface. The proposed theory predicts qualitatively that the wear particle shape is likely to be thin flake-like sheets and that the surface layer can undergo large plastic deformation. It also predicts a number of experimentally observed phenomena such as the difference in wear particle sizes and the dependence of fretting wear rate on displacement amplitude. All theoretical predictions are supported by experimental evidences. A wear equation is developed based on the proposed theory.
797 citations
TL;DR: In this paper, the genesis of friction is explained in terms of a new theory, which postulates that the frictional force (and thus the friction coefficient μ) is affected by the sliding distance and the environment because of the changing contributions of three components of friction, i.e., deformation of surface asperities, plowing by wear particles and hard as perities, and adhesion of the flat portions of the sliding surface.
374 citations
TL;DR: In this article, a new model for the source of friction during the steady-state sliding of metals is described, focusing on the plastic work done in the near-surface region, described in terms of work hardening, recovery and the microstructure existing during steady state sliding.
310 citations
269 citations