Abstract
A SOFT copper crystal, cycled between constant alternating total strain limits, shows an initially rapid increase in the required alternating peak stresses, ± σp. At low amplitudes (lives greater than 106 cycles) the increase in peak stress becomes very slow after ∼ 1 per cent of the expected life. A crystal in this state is said to be fatigue hardened to saturation. Similar behaviour is observed for other face-centred cubic metals of high stacking-fault energy, for example, aluminium or nickel (for a review see ref. 1).
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References
Avery, D. H., and Backofen, W. A., Fracture of Solids, edit. by Drucker, D. C., and Gilman, J. J., 339 (Gordon and Breach, New York, 1963).
Segall, R. L., Electron Microscopy and the Strength of Crystals, 515 (Interscience, New York, 1963).
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Broom, T., and Ham, R. K., Proc. Roy. Soc., A, 251, 186 (1959).
Laufer, E. E., and Roberts, W. N., Phil. Mag., 10, 883 (1964).
Halford, G. R., thesis, Univ. Illinois, Urbana; see also J. Metals, 17, 1032 (1965).
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WATT, D., HAM, R. Fatigue Hardening in Face-centred Cubic Metals. Nature 211, 734–735 (1966). https://doi.org/10.1038/211734a0
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DOI: https://doi.org/10.1038/211734a0
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