Evaluating stress intensity factors of a surface crack in lubricated rolling contacts |
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Authors: | S.H. Ju K.C. Cha |
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Affiliation: | (1) Department of Civil Engineering, National Cheng-Kung University, Tainan, Taiwan, R.O.C. e-mail;(2) Chung-Shan Institute of Science and Technology, Lung-Tan, Taiwan, R.O.C |
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Abstract: | The three-dimensional finite element method and the least-squares method were used to find the stress intensity factors (SIFs) of a surface crack in a lubricated roller. A steel roller on a rigid plane was modeled, in which a semi-elliptical surface crack is inclined at an angle ψ to the vertical axis. A distance c is set between the crack base and the roller edge. The results indicate that the mode-I SIF reaches the maximum value when the angle θ is equal to 0° (on the roller surface), and the mode-II SIF reaches the absolute maximum value when the angle θ is near or equal to 90° (inside the roller), where θ is the angle of the semi-ellipse from 0° to 180°. The influence of mode-III SIFs in this model is minor since they are much smaller than the mode-I and mode-II SIFs. The SIFs increase greatly when the crack location approaches the uncrowned edge. At this time, a crowned profile can be used to significantly reduce the SIFs near the roller edge. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Crack finite element method least-squares roller bearing stress intensity factors. |
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