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Advances in Tribology
Volume 2010 (2010), Article ID 258307, 14 pages
http://dx.doi.org/10.1155/2010/258307
Research Article

Effect of the Material Parameters on Layered Viscoelastic Frictional Contact Systems

Department of Mechanical Engineering, College of Engineering, Zagazig University, Zagazig 44511, Egypt

Received 12 November 2009; Revised 19 March 2010; Accepted 29 March 2010

Academic Editor: Arvind Agarwal

Copyright © 2010 Fatin F. Mahmoud et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the design process, one of the main targets is to reduce the peak values of the contact stresses. This can be attained by layering the contacting bodies by layers of different material characteristics. Viscoelastic materials are characterized by either a stress relaxation or a creep deformation; therefore, the contacting bodies can be layered with such materials to attain this target. This paper discusses effects of the material characteristics of viscoelastic layers upon the unbounded contact configuration. Three material parameters are considered: the layer/contact solids stiffness ratio, the delayed/instantaneous elasticity ratio, and the material relaxation time. The results are obtained by using a two-dimensional time-dependent nonlinear computational model, developed by the authors, capable of analyzing quasistatic viscoelastic frictional contact problems.