Contact modeling in boundary element analysis including the simulation of thermomechanical wear.pdfVIP

Tribology International 100 (2016) 360–370 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint Contact modeling in boundary element analysis including the simulation of thermomechanical wear Gary F. Dargush n, Andres Soom Department of Mechanical and Aerospace Engineering, University at Buffalo. State University of New York, 318 Jarvis Hall, Buffalo, NY 14260, USA article info Article history: Received 23 November 2015 Received in revised form 31 March 2016 Accepted 1 April 2016 Available online 7 April 2016 Keywords: Contact mechanics Surface roughness Local wear model Boundary element method abstract Computational mechanics codes include contact or over-closure models to account for contact stiffness, which can be related to surface roughness and nominal pressure from Greenwood and Williamson. We present results of wear simulation studies with adjustable contact parameters for a ring-on-ring sliding con?guration. A boundary element code is used to solve the non-linear contact problem with an axisymmetric thermoelastic representation of the rings, along with a localized Archard wear model. Parametric studies indicate the extent to which the wear tracks can be affected by the roughness and wear history. The effects range from minor to moderately signi?cant, with areas of maximum wear shifting radially. Contact parameters in?uence pressure, temperature and wear distributions, with stiffer contacts resulting in greater localization. 2016 Elsevier Ltd. All rights reserved. 1. Introduction When machine elements carry loads in sliding contact, friction and wear take place, often at the asperity level. During the 1940s and 50s a number of researchers noted that wear tests frequently showed that the overall (volumetric, global, or total) wear was proportional to applied load and sliding distance and inversely proportional to material hardness. This culminated in what is often called the Archard Wear Law [1]. This approach w