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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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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DOI: https://doi.org/10.1007/BF02644801