JOTwearPred2010 - PROOF COPY [TRIB-09-1145] 019003JTQ Saad...

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PROOF COPY [TRIB-09-1145] 019003JTQ PROOF COPY [TRIB-09-1145] 019003JTQ Saad Mukras Assistant Professor Department of Mechanical Engineering, Qassim University, Buraydah, Qassim, Saudi Arabia e-mail: Nam H. Kim 1 Associate Professor e-mail: Nathan A. Mauntler Graduate Student e-mail: Tony Schmitz Associate Professor e-mail: W. Gregory Sawyer Professor e-mail: Department of Mechanical and Aerospace Engineering, University of ±lorida, Gainesville, ±L Comparison Between Elastic Foundation and Contact Force Models in Wear Analysis of Planar Multibody System In this paper, two procedures to analyze planar multibody systems experiencing wear at a revolute joint are compared. In both procedures, the revolute joint of interest includes a clearance whose shape and size are dictated by wear. The procedures consist of coupled iterative analyses between a dynamic system analysis with nonideal joints and a wear prediction to determine the evolution of the joint clearance. In the Frst procedure, joint forces and contact pressures are estimated using the elastic foundation model with hysteresis damping via the dynamic analysis. In the second procedure, a contact force model with hysteresis damping is used to estimate the joint forces. In the latter case, however, the contact pressure is estimated using a Fnite element method (±EM). A com- parison in performance of the two models is facilitated through the use of an experimen- tal slider-crank mechanism in which wear is permitted to occur at one of the joints. It is observed that the two procedures provide similar estimates for the dynamic response and wear volumes but substantially different predictions on the wear proFles. Additionally, experimental results show that while predictions on the wear volume from both models are reasonably accurate, the ±EM-based model produced more accurate predictions on the wear proFle. f DOI: 10.1115/1.4001786 g Keywords: wear, contact, elastic foundation, Fnite element, multibody dynamics, joint clearance 1 Introduction Mechanical/multibody systems consist of a number of compo- nents that are interconnected by joints. These joints typically con- sist of at least two components that are in contact and experience relative motions. It is therefore inevitable that joint wear will oc- cur. Depending on the system conFguration and the amount of wear at the joints, the performance of the system may be ad- versely affected. It is therefore no surprise that a considerable amount of effort has been expended to develop ways to account for wear in the design process. One approach is to develop pro- cedures that can be used to estimate wear beforehand. A trend that has developed in this regard is the use of Archard’s f 1 g wear model in an iterative wear prediction scheme. In this scheme, incremental wear is estimated based on the relative sliding, the contact pressure, and tribological data s typically in the form of a wear coefFcient d that describe the operating conditions. The ge-
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JOTwearPred2010 - PROOF COPY [TRIB-09-1145] 019003JTQ Saad...

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