The propagation of a crack initiating at the surface was analyzed to simulate the fatigue wear behavior of glassy polymer materials. A crack in a material half plane was assumed to propagate along a predefined path as a result of contact loading by a cylinder sliding on the polymer surface. The crack path consisted of a vertical straight-line segment and a declined straight line originating at a branch point on the vertical crack segment. The stress intensity factors and along the crack path were computed by using finite element methods, and their values utilized in the Paris law to determine crack propagation rates. Because this process simulates surface pitting, component fatigue life is assumed to be proportional to the time needed for the propagating declined crack to intersect a neighboring vertical crack, a condition known to lead to pitting. This fatigue life is estimated by integrating the Paris law. Numerical results show that the branch point where the declined crack path originates can effectively hinder crack propagation, and that the rate limiting step in fatigue is crack propagation along a small segment of the declined crack near the branch point. Some important factors that affect the reliability of numerically predicted fatigue life cycles are discussed. Experimental crack propagation paths and lifetimes are shown.
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April 2003
Technical Papers
Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers
Keyanoush Sadeghipour,
Keyanoush Sadeghipour
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
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George Baran,
George Baran
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
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Hanqing Zhang,
Hanqing Zhang
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
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Wei Wu
Wei Wu
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
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Keyanoush Sadeghipour
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
George Baran
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
Hanqing Zhang
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
Wei Wu
Department of Mechanical Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division June 11, 2001; revision received July 2, 2002. Associate Editor: R. Craig McClung.
J. Eng. Mater. Technol. Apr 2003, 125(2): 97-106 (10 pages)
Published Online: April 4, 2003
Article history
Received:
June 11, 2001
Revised:
July 2, 2002
Online:
April 4, 2003
Citation
Sadeghipour , K., Baran , G., Zhang , H., and Wu, W. (April 4, 2003). "Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers ." ASME. J. Eng. Mater. Technol. April 2003; 125(2): 97–106. https://doi.org/10.1115/1.1543967
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