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Near-threshold fatigue crack growth behavior in copper

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Abstract

Near-threshold fatigue crack growth rate data were developed in annealed, quarter-hard, and full-hard copper at various load ratios, (R = σmin/σmax). Increasing theR value decreases the resistance to threshold crack growth. At a fixed value ofR, annealed copper has the slowest near-threshold crack propagation rate while full-hard copper has the fastest crack growth rate. Waveform (sine and triangle) and specimen geometry (WOL, CT, and CCT) do not appear to affect the rates of near-threshold crack propagation. The influences of load ratio and material strength on threshold crack growth behavior can be rationalized by crack closure.

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Authors and Affiliations

  1. Materials Engineering Department, Westinghouse Research and Development Center, USA

    Peter K. Liaw (Senior Engineer) & M. G. Peck

  2. Westinghouse Steam Turbine Generator Division, USA

    T. R. Leax (Research Technician)

  3. Physical Metallurgical Department, Westinghouse Research and Development Center, 15235, Pittsburgh, PA

    R. S. Williams (Advanced Engineer)

Authors
  1. Peter K. Liaw
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  2. T. R. Leax
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  3. R. S. Williams
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  4. M. G. Peck
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Liaw, P.K., Leax, T.R., Williams, R.S. et al. Near-threshold fatigue crack growth behavior in copper. Metall Trans A 13, 1607–1618 (1982). https://doi.org/10.1007/BF02644801

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