Experimental and Fracture Mechanics Study of the Pit Formation Mechanism Under Repeated Lubricated Rolling-Sliding Contact: Effects of Reversal of Rotation and Change of the Driving Roller

[+] Author and Article Information
Y. Murakami, C. Sakae, K. Ichimaru, T. Morita

Department of Mechanical Science and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812 Japan

J. Tribol 119(4), 788-796 (Oct 01, 1997) (9 pages) doi:10.1115/1.2833886 History: Received September 12, 1995; Revised July 18, 1996; Online January 24, 2008


Five rolling contact fatigue tests, Tests {1}–{5} have been conducted. In Tests {1}–{3}, when a fatigue crack was initiated on the surface of a follower, the test was halted. Then, in Test {1} the rotating direction was reversed. In Test {2} the follower and driver were interchanged, and in Test {3} the test was continued unchanged. In Test {3} the original crack grew to a pit. In Tests {1} and {2} the original crack immediately stopped propagating. In Tests {4} and {5}, mating with a harder roller, a softer roller was used as the follower in Test {4} and as the driver in Test {5}. A typical pit occurred in Test {4}. In Test {5}, surface damage substantially different from a typical pit was generated. Based on these experimental results, a 3-D crack analysis including the effect of frictional force on the contact surface and oil hydraulic pressure on crack surfaces, was conducted to elucidate the mechanisms of pit formation and surface damage in contact fatigue.

Copyright © 1997 by The American Society of Mechanical Engineers
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