STP1359: A Fractographic Study of Load-Sequence-Induced Mixed-Mode Fatigue Crack Growth in an Al-Cu Alloy

    Ashbaugh, NE
    University of Dayton Research Institute, Dayton, OH

    Porter, WJ
    University of Dayton Research Institute, Dayton, OH

    Prakash, RV
    BiSS Research, Bangalore,

    Sunder, R
    BiSS Research, Bangalore,

    Pages: 21    Published: Jan 1999


    Abstract

    Fatigue crack growth behavior was studied on C(T) and SE(T) specimens from Al-Cu alloy 2014 using specially-designed load sequences. The experiments were organized to induce microscopic mixed-mode fatigue crack growth while at the same time reducing or eliminating fatigue crack closure. This was achieved by switching between high-amplitude, low-stress ratio and low-amplitude, high-stress ratio cycles. Retardation effects observed under these conditions are attributed to local crack branching and mixed-mode conditions induced by variable amplitude loading.

    Keywords:

    fatigue crack growth, mixed mode, fractography, programmed loading


    Paper ID: STP14253S

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP14253S


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