STP1323

    Analysis of Fatigue Crack Propagation by Quantitative Fractography

    Published: Jan 2001


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    Abstract

    Based on constant amplitude fatigue tests on 12 mm thick plates, in a 2024 T351 aluminum alloy, a previous study has shown that the spatial distribution of predominant facies reflects the effects of stress intensity factor and the load ratio. In this paper, this technique is applied to constant amplitude crack propagation tests to thin plates of the same material, and it is shown that the quantitative fracture surface analysis method developed permits to distinguish the effects of fracture mechanics parameters. Results obtained under variable amplitude tests are then analyzed. The fracture surface analysis permits the identification of a change in fracture mode and accurate life evaluation can then be made after taking into account the observed change. In the case of an aluminum lithium alloy this method cannot be directly applied due to changes in fracture mechanisms under variable amplitude loading. But an analysis is carried out by taking into account associated changes in crack closure levels, which leads to excellent life predictions under variable amplitude test conditions.

    Keywords:

    Fatigue crack propagation, variable amplitude loading, fractography, striations, facets, dimples, quantification, aluminum alloys, life prediction


    Author Information:

    Ranganathan, Narayanaswami
    Professor, Research scholar, Assistant professor and associate professor, L.M.R., E.I.T., Tours,

    Gerard, Nicolas
    Professor, Research scholar, Assistant professor and associate professor, L.M.R., E.I.T., Tours,

    Tougui, Abdellah
    Professor, Research scholar, Assistant professor and associate professor, L.M.R., E.I.T., Tours,

    Leroy, René
    Professor, Research scholar, Assistant professor and associate professor, L.M.R., E.I.T., Tours,

    Benguediab, Mohamed
    Assistant Professor and Lecturer, Institut de Génie Mécanique, Université de Sidi bel Abbes,

    Mazari, Mohamed
    Assistant Professor and Lecturer, Institut de Génie Mécanique, Université de Sidi bel Abbes,

    Nadot, Yves
    Assistant Professor and Research Director, Laboratoire de Mécanique et Physique des Matériaux, U.M.R 6617, ENSMA, Futuroscope,

    Petit, Jean
    Assistant Professor and Research Director, Laboratoire de Mécanique et Physique des Matériaux, U.M.R 6617, ENSMA, Futuroscope,


    Paper ID: STP42141S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP42141S


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