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The early stage of fatigue crack propagation in al 2048

  • Mechanical Behavior
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Abstract

Microcracks which develop at the surface of Al 2048 subjected to fully reversed fatigue loading are found to be partially open at zero load. The magnitude of such residual crack openings measured at the test specimen surface is determined as a function of the crack length and the relative humidity in which the specimens were fatigued. For a fixed crack length the residual crack openings are found to be largest if the relative humidity is low or if the crack path is particularly irregular. The present interpretation of the phenomenon is that the residual crack openings are indirectly related to the crack closure load associated with the microcracks.

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  1. Technical Staff, Science Center, Rockwell International, 91360, Thousand Oaks, CA

    W. L. Morris (Member)

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  1. W. L. Morris
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Morris, W.L. The early stage of fatigue crack propagation in al 2048. Metall Trans A 8, 589–596 (1977). https://doi.org/10.1007/BF02676980

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