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Contact of crack surfaces during fatigue: Part 1. formulation of the model

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Abstract

A model has been developed to predict crack opening and closing behavior for propagating fatigue cracks which undergo significant sliding displacements at crack flanks. Crack surfaces were described statistically by assuming a random distribution of asperity heights and a mean density of asperities and asperity radii. The propagating crack was subdivided into strips, and each strip was treated as a contact problem between two randomly rough surfaces. The remote tensile stresses were varied in a cyclical manner. The contact stresses at minimal load were determined by analyzing the local crushing of asperities via a sliding mechanism. Then, upon loading, the crack opening stress levels were computed when the contact stresses were overcome. Part 1 of this article includes a discussion of the previous models, then introduces statistical contact mechanics concepts which are utilized in the fatigue crack growth simulations. In addition, the numerical algorithms for the modeling work and the sensitivity of results to model parameters are described. The role of stress ratio, maximum stress level, crack length, and the geometry of crack surfaces on the crack growth behavior will be discussed in Part 2 of this article.

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Authors and Affiliations

  1. the Department of Mechanical and Industrial Engineering, University of Illinois, 61801, Urbana, IL

    Ana María García (Research Assistant) & Huseyin Sehitoglu (Professor and Associate Head)

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  1. Ana María García
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  2. Huseyin Sehitoglu
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García, A.M., Sehitoglu, H. Contact of crack surfaces during fatigue: Part 1. formulation of the model. Metall Mater Trans A 28, 2263–2275 (1997). https://doi.org/10.1007/s11661-997-0184-5

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  • DOI: https://doi.org/10.1007/s11661-997-0184-5

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