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Fatigue crack deflection and fracture surface contact: Micromechanical models

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Abstract

The variation of cyclic crack propagation rates, under thecombined influence of crack kinking (deflection) and fracture surface contact (closure), is estimated from simple linear elastic analyses of tilted cracks. The predictions of the models are consistent with the experimental results of linear and kinked crack advance in high strength aluminum alloys testedin vacuo. Examples of crack deflection in various engineering alloy systems and some generalizations ofaverage deflection parameters based on microstructural and mechanical factors are discussed. The individual contributions to overall growth rates from deflection and closure processes are evaluated for different mechanical and metallurgical conditions. The significance, implications, and limitations of the models are outlined.

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Authors and Affiliations

  1. Division of Engineering, Brown University, 02912, Providence, RI

    S. Suresh (Assistant Professor)

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  1. S. Suresh
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Suresh, S. Fatigue crack deflection and fracture surface contact: Micromechanical models. Metall Trans A 16, 249–260 (1985). https://doi.org/10.1007/BF02816051

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