The Evolution of Geometry for a Wearing Circular Cam: Analytical and Computer Simulation With Comparison to Experiment

[+] Author and Article Information
D. J. Dickrell, W. G. Sawyer

University of Florida, Mechanical Engineering Department, Gainesville, FL 32611

D. B. Dooner

University of Puerto Rico, Mechanical Engineering Department, Mayaguez, PR 00681-9045

J. Tribol 125(1), 187-192 (Dec 31, 2002) (6 pages) doi:10.1115/1.1504092 History: Received February 07, 2002; Revised June 26, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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Podra,  P., and Andersson,  S., 1999, “Simulating Sliding Wear With Finite Element Method,” Tribol. Int., 32, pp. 71–81.
Blanchet,  T. A., 1997, “The Interaction of Wear and Dynamics of a Simple Mechanism,” ASME J. Tribol., 119, pp. 597–599.
Sawyer,  W. G., 2001, “Wear Predictions for a Simple-Cam Including the Coupled Evolution of Wear and Load,” Lubr. Eng., pp. 31–36.
Sawyer, W. G., Diaz, K. I., Hamilton, M. A., and Micklos, B., 2001, “Evaluation of an Analytical Model for the Evolution of Wear and Load in a Scotch-Yoke Mechanism,” ASME J. Tribol., submitted to the Journal of Tribology.
Dinc,  O. S., Cromer,  R., and Calabrese,  S. J., 1995, “Redesigning Mechanical Systems for Low Wear Using System Dynamics Modeling,” ASME J. Tribol., 35, pp. 1–8.


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Schematic of the cam follower experimental test rig. The two follower configuration gives 2 cycles per cam revolution.
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Schematic and nomenclature for the simple eccentrically mounted circular cam
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Illustration of two configurations of interest for the analytical modeling (a) wear proceeds directly along the cam radius, and (b) wear proceeds along the cam radius and the eccentricity vector
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Schematic and nomenclature for the computer simulation
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A flowchart for the computer simulation
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Error estimation using a wear-rate 10,000x greater than the experimentally determined value as a function of number of cycles
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Comparison between the measured (crosses), analytical predictions (curve), and the computer simulation (○) for (a) the average radius of curvature, and (b) the cam eccentricity
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Comparisons between the measured, analytical, and computer simulation for the cam shape
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Comparison between the extrapolated shape from cycle 1 and the measured shape



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