Analysis of the Size Effect in Partial-Slip Contact Fatigue

[+] Author and Article Information
K. Iyer

Impact Physics Branch, U.S. Army Research Lab, Attn: AMSRD-ARL-WM-TD, Aberdeen Proving Ground, MD 21005-5069

J. Tribol 127(2), 443-446 (Apr 07, 2005) (4 pages) doi:10.1115/1.1739411 History: Received March 18, 2003; Revised November 06, 2003; Online April 07, 2005
Copyright © 2005 by ASME
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Illustration of the size effect in partial-slip contact fatigue observed by Hills et al. 12. The fatigue life was found to drop abruptly in the high-cycle fatigue (HCF) portion of the S-N curve, i.e., from ∼10 million cycles to 1-2 million cycles.
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(a) Finite element model of the cylinder-on-flat contact configuration. Note that the dimension of the contact region, which is initially a line, is obscured by the highly refined mesh in the contact region. (b) Comparison of the normalized local bulk stress distributions obtained using the model with the available semi-analytical solution that considers a half-space 8.
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Computed parameters examined in the present study. This includes the contact pressure, p, and local bulk stresses σL,max and σL,min, adjacent and parallel to the contact interface. Distance, x, in the region of contact is normalized by the computed contact semi-width, a. The particular distributions shown above are obtained for conditions described as series 4 in Table 1 (25.4 mm pad radius).
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Computed values of (a) the maximum local bulk stress in the substrate, σL,max, under maximum nominal stress during the fatigue load cycle and (b) the maximum local bulk cyclic stress range in the substrate, ΔσL,max, under the cyclic loading conditions, for the conditions (see Table 1) used in the original 5 series of tests 2




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