This paper addresses the issue of environmentally-assisted fatigue crack propagation in metallic and intermetallic alloys, which is essential to predict the durability of aerospace components. A review of the current understanding of the mechanisms accounting for the detrimental effect of air on fatigue crack growth resistance of conventional alloys is first presented. The adequacy of the two sequential processes identified, namely water vapour adsorption on crack tip surfaces and hydrogen embrittlement of cyclically deformed material within the plastic zone, to account for environmentally-assisted fatigue crack propagation in alloys based on intermetallic compounds is then examined. The last section is devoted to the analysis of environmental effects during creep-fatigue crack growth in an age-hardened aluminium alloy for supersonic aircraft. In particular the influence of environment on the intergranular cavitation damage process is analysed.


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    Title :

    Environmentally-assisted fatigue crack growth mechanisms in advanced materials for aerospace applications


    Additional title:

    Umweltbedingte Einflüsse auf den Verlauf des Ermüdungsrisswachstums in neuartigen Materialien für Anwendungen in der Luft- und Raumfahrt


    Contributors:

    Published in:

    International Journal of Fatigue ; 29 , 9-11 ; 1927-1940


    Publication date :

    2007


    Size :

    14 Seiten, 69 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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