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The influence of load ratio on fatigue crack growth in 7090-t6 and in9021-t4 p/m aluminum alloys

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Abstract

The rate of fatigue crack growth has been studied over a wide range of growth rates in two high strength P/M aluminum alloys as a function ofR, with particular attention given to crack closure and near-threshold behavior. A principal difference between the two alloys was grain size, being less than oneµm for the alloy IN9021* and greater than five µm for the alloy 7090. No closure was found in the fine-grained alloy nor was there any dependency of the threshold level onR. In contrast, closure was observed in the coarser grained alloy and there was also a dependency of the threshold level onR. The observations are discussed in terms of current models for threshold behavior. Consideration is also given to the overall fatigue crack growth behavior of these P/M in comparison to that of a conventional high strength I/M aluminum alloy.

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Authors and Affiliations

  1. Nippon Kokkan KK Technical Research Center, Kawasaki, Japan

    K. Minakawa

  2. Pratt and Whitney Aircraft Corp., Middletown, CT

    G. Levan

  3. Metallurgy Department and Institute of Materials Science, University of Connecticut, 06268, Storrs, CT

    A. J. McEvily (Professor of Metallurgy)

Authors
  1. K. Minakawa
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  2. G. Levan
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  3. A. J. McEvily
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K. Minakawa, formerly Assistant Professor, Metallurgy Department, University of Connecticut

G. Levan, formerly Graduate Assistant, Metallurgy Department, University of Connecticut

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Minakawa, K., Levan, G. & McEvily, A.J. The influence of load ratio on fatigue crack growth in 7090-t6 and in9021-t4 p/m aluminum alloys. Metall Trans A 17, 1787–1795 (1986). https://doi.org/10.1007/BF02817276

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  • DOI: https://doi.org/10.1007/BF02817276

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