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A geometric model for fatigue crack closure induced by fracture surface roughness

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Abstract

Mechanisms for fatigue crack closure under plane strain conditions have recently been identified at very low (near-threshold) stress intensities in terms of effects of excess corrosion deposits or fracture surface roughness in promoting premature closure of the crack. In the present paper, a geometric model is presented for crack closure induced by fracture surface roughness. This model specifically addresses the contribution from both Mode I and Mode II crack tip displacements in addition to considering the nature of the fracture surface morphology. The implications of this model are briefly discussed in light of the roles of grain size, yield strength, microstructure, and crack size in influencing near-threshold fatigue behavior in engineering alloys.

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Authors and Affiliations

  1. Department of Materials Science and Mineral Engineering, and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, CA

    S. Suresh (Lecturer) & R. O. Ritchie (Professor)

Authors
  1. S. Suresh
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  2. R. O. Ritchie
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Suresh, S., Ritchie, R.O. A geometric model for fatigue crack closure induced by fracture surface roughness. Metall Trans A 13, 1627–1631 (1982). https://doi.org/10.1007/BF02644803

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  • DOI: https://doi.org/10.1007/BF02644803

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