Effect of thermal residual stresses on fatigue crack opening and propagation behavior in an Al/SiCp metal matrix composite

M.E. Fitzpatrick, M.T. Hutchings, J.E. King, D.M. Knowles, P.J. Withers

    Research output: Contribution to journalArticle

    Abstract

    The effects of a thermal residual stress field on fatigue crack growth in a silicon carbide particle-reinforced aluminum alloy have been measured. Stress fields were introduced into plates of material by means of a quench from a solution heat-treatment temperature. Measurements using neutron diffraction have shown that this introduces an approximately parabolic stress field into the plates, varying from compressive at the surfaces to tensile in the center. Long fatigue cracks were grown in specimens cut from as-quenched plates and in specimens which were given a stress-relieving overaging heat treatment prior to testing. Crack closure levels for these cracks were determined as a function of the position of the crack tip in the residual stress field, and these are shown to differ between as-quenched and stress-relieved samples. By monitoring the compliance of the specimens during fatigue cycling, the degree to which the residual stresses close the crack has been evaluated. © 1995 The Minerals, Metals & Material Society.
    Original languageEnglish
    Pages (from-to)3191-3198
    Number of pages8
    JournalMetallurgical and Materials Transactions A
    Volume26
    Issue number12
    DOIs
    Publication statusPublished - Dec 1995

    Fingerprint

    metal matrix composites
    thermal stresses
    Thermal stress
    stress distribution
    residual stress
    Residual stresses
    cracks
    Metals
    propagation
    Composite materials
    Heat treatment
    Cracks
    Stress relief
    Crack closure
    heat treatment
    stress relieving
    crack closure
    Neutron diffraction
    Fatigue crack propagation
    Silicon carbide

    Keywords

    • aluminum alloys
    • crack propagation
    • fatigue of materials
    • heat treatment
    • mechanical variables measurement
    • neutron diffraction
    • plate metal
    • quenching
    • residual stresses
    • silicon carbide
    • temperature
    • thermal stress
    • compressive stress
    • crack closure levels
    • crack tip
    • fatigue crack opening
    • fatigue cycling
    • tensile stress
    • thermal residual stresses
    • metallic matrix composites

    Cite this

    Fitzpatrick, M.E. ; Hutchings, M.T. ; King, J.E. ; Knowles, D.M. ; Withers, P.J. / Effect of thermal residual stresses on fatigue crack opening and propagation behavior in an Al/SiCp metal matrix composite. In: Metallurgical and Materials Transactions A. 1995 ; Vol. 26, No. 12. pp. 3191-3198.
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    title = "Effect of thermal residual stresses on fatigue crack opening and propagation behavior in an Al/SiCp metal matrix composite",
    abstract = "The effects of a thermal residual stress field on fatigue crack growth in a silicon carbide particle-reinforced aluminum alloy have been measured. Stress fields were introduced into plates of material by means of a quench from a solution heat-treatment temperature. Measurements using neutron diffraction have shown that this introduces an approximately parabolic stress field into the plates, varying from compressive at the surfaces to tensile in the center. Long fatigue cracks were grown in specimens cut from as-quenched plates and in specimens which were given a stress-relieving overaging heat treatment prior to testing. Crack closure levels for these cracks were determined as a function of the position of the crack tip in the residual stress field, and these are shown to differ between as-quenched and stress-relieved samples. By monitoring the compliance of the specimens during fatigue cycling, the degree to which the residual stresses close the crack has been evaluated. {\circledC} 1995 The Minerals, Metals & Material Society.",
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    Effect of thermal residual stresses on fatigue crack opening and propagation behavior in an Al/SiCp metal matrix composite. / Fitzpatrick, M.E.; Hutchings, M.T.; King, J.E.; Knowles, D.M.; Withers, P.J.

    In: Metallurgical and Materials Transactions A, Vol. 26, No. 12, 12.1995, p. 3191-3198.

    Research output: Contribution to journalArticle

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    AU - Fitzpatrick, M.E.

    AU - Hutchings, M.T.

    AU - King, J.E.

    AU - Knowles, D.M.

    AU - Withers, P.J.

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    AB - The effects of a thermal residual stress field on fatigue crack growth in a silicon carbide particle-reinforced aluminum alloy have been measured. Stress fields were introduced into plates of material by means of a quench from a solution heat-treatment temperature. Measurements using neutron diffraction have shown that this introduces an approximately parabolic stress field into the plates, varying from compressive at the surfaces to tensile in the center. Long fatigue cracks were grown in specimens cut from as-quenched plates and in specimens which were given a stress-relieving overaging heat treatment prior to testing. Crack closure levels for these cracks were determined as a function of the position of the crack tip in the residual stress field, and these are shown to differ between as-quenched and stress-relieved samples. By monitoring the compliance of the specimens during fatigue cycling, the degree to which the residual stresses close the crack has been evaluated. © 1995 The Minerals, Metals & Material Society.

    KW - aluminum alloys

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    KW - fatigue of materials

    KW - heat treatment

    KW - mechanical variables measurement

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    KW - plate metal

    KW - quenching

    KW - residual stresses

    KW - silicon carbide

    KW - temperature

    KW - thermal stress

    KW - compressive stress

    KW - crack closure levels

    KW - crack tip

    KW - fatigue crack opening

    KW - fatigue cycling

    KW - tensile stress

    KW - thermal residual stresses

    KW - metallic matrix composites

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