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The orientation dependence of fatigue-crack growth in 8090 Al-Li plate

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Abstract

A series of fatigue-crack growth rate (FCGR) tests was carried out on 8090 Al-Li plate to examine the effects of specimen orientation on fatigue-crack growth. The directionality of fatigue fracture behavior is found to be related to the strong {110}〈112〉 texture in this alloy. Based on a previously developed transgranular FCGR model using restricted slip reversibility (RSR) concepts, [1] a mechanistic model is developed for transgranular fatigue-crack growth in highly textured materials. The model takes the form of the Paris relationship with a power law exponent of 3, and the material texture is shown to strongly influence the proportional factor. The effect of texture on FCGR is related through a geometric factor cos2 ϕ, where ϕ defines the angle between the load axis and the normal of the favorable slip plane. The effect of specimen orientation on FCGR in 8090 Al-Li alloy is shown to be related to a combination of its anisotropic mechanical properties and the variation of angleϕ with specimen orientation. The model further predicts that fatigue-crack growth rates will be slower in many textured materials than texturefree materials becauseϕ > 0 and cos2 ϕ < 1.

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Authors and Affiliations

  1. Structures, Materials and Propulsion Laboratory, Institute for Aerospace Research, National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada

    X. J. Wu (Visiting Fellow), W. Wallace M.D. (Director), M. D. Raizenne (Senior Research Officer) & A. K. Koul (Senior Research Officer)

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  1. X. J. Wu
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  2. W. Wallace M.D.
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  3. M. D. Raizenne
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  4. A. K. Koul
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Wu, X.J., Wallace, W., Raizenne, M.D. et al. The orientation dependence of fatigue-crack growth in 8090 Al-Li plate. Metall Mater Trans A 25, 575–588 (1994). https://doi.org/10.1007/BF02651599

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