Foreign object damage (FOD) has been identified as one of the main life limiting factors for aeroengine blades, with the leading edge of aerofoils particularly susceptible. In this work, a generic edge 'aerofoil'geometry was utilized in a study of early fatigue crack growth behaviour due to FOD under low cycle fatigue (LCF), high cycle fatigue (HCF) and combined LCF and HCF loading conditions. Residual stresses due to FOD were analyzed using the finite element method. The longitudinal residual stress component along the crack path was introduced as a nodal temperature distribution, and used in the correction of the stress intensity factor range. The crack growth was monitored using a nanodirect current potential drop (DCPD) system and crack growth rates were correlated with the corrected stress intensity factor considering the residual stresses. The results were discussed with regard to the role of residual stresses in the characterization of fatigue crack growth. Small crack growth behaviour in FODed specimens was revealed only after the residual stresses were taken into account in the calculation of the stress intensity factor, a feature common to LCF, HCF and combined LCF + HCF loading conditions.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Influence of foreign object damage on fatigue crack growth of gas turbine aerofoils under complex loading conditions


    Contributors:
    Hall, R. (author) / Byrne, J. (author) / Zhao, T. (author) / Tong, Jie (author)


    Publication date :

    2008


    Size :

    12 Seiten, 33 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Fatigue Crack Growth in Laser Shock Peened Ti-6AL-4V Aerofoils Subjected to Foreign Object Damage

    Spanrad, S. / Tong, J. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012



    Aerofoils

    Sinnatt, O.T. | Engineering Index Backfile | 1926


    Machining aerofoils

    Pearson, H.J. | Engineering Index Backfile | 1958