STLEbushing2004 - Downloaded By: [University of Florida]...

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Downloaded By: [University of Florida] At: 17:58 27 February 2008 Tribology Transactions, 47: 257-262, 2004 Copyright C ° Society of Tribologists and Lubrication Engineers ISSN: 0569-8197 print / 1547-397X online DOI: 10.1080/05698190490439175 Evolution of Wear in a Two-Dimensional Bushing DANIEL J. DICKRELL, III and W. GREGORY SAWYER Department of Mechanical and Aerospace Engineering University of Florida Gainesville, Florida 32611 A model for the evolution of wear for the shaft and bushing for a simple two-dimensional bushing system was developed under the assumptions of uniform contact pressure and constant applied load. A simple laboratory apparatus was constructed to test the model. Two experiments were run; one showed wear on the shaft only and the other showed wear on the bushing only. The results showed the predicted linear progression of wear. KEY WORDS Bushings; Wear INTRODUCTION Improvements in modeling the cycle- or time-dependent pro- gression of wear in simple mechanisms can aid designers and en- gineers in predicting the useful lifetimes for machines and systems made up of these simple components. This evolution of wear for individual components can be approached with many different numerical and analytical techniques, although, to date, physical testing remains the “gold standard.” Modeling a change in part geometry for a mechanism at any particular cycle requires knowledge of the contact conditions, tri- bological data for the materials in contact, and accurate descrip- tions of the current geometry. Thus, any numerical or analytical treatment will follow the progression of the mechanism’s geom- etry from the initial conditions forward to any particular cycle of interest. Past experience has shown that estimating a component’s geometryatanyparticularcyclebyassumingalinearextrapolation of the initial contact and wear data can result in gross underesti- mates (Blanchet (1) ) or overestimates (Sawyer (2) ). Successful techniques for predicting worn shapes follow the progression of wear forward from the initial cycle. However, this approach is extremely numerically intensive, and only recently have the errors associated with making periodic extrapolations along the way been evaluated (Dickrell, et al. (3) ). Finite element methods are popular computer-aided engineering techniques that are well utilized in many ±elds of life prediction. Unfortunately, due to many dif±culties sur- Presented at the STLE 58th Annual Meeting in New York City April 28-May 1, 2003 Final manuscript approved January 8, 2004 Review led by Thierry Blanchet rounding contact and updating component geometry it is not widely used to model wear. In cases where ±nite element models were coupled with wear models to tackle speci±c components, the cycle-by-cycle approach was found to be successful; notably, Hugnell, et al. (4) modeled a cam-follower contact, Maxian, et al.
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STLEbushing2004 - Downloaded By: [University of Florida]...

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