The requirement for low weight-to-thrust ratios of modern aero-engines has led to high structure loads and design of parts in the range of low cycle fatigus. In order to ensure high reliability and optimized TBO's (time between overhaul), methods to calculate accurately the durability of parts are of great interest. For a highly loaded compressor disc of a fighter engine the lifetime was calculated using the nominal stress method and the maximum local strain concept. The nominal and maximum local stresses and strains were calculated with a finite-element program which was extended to consider plastic deformation of materials. The reference load cycle, which was the same for both methods, was derived from actual load measurements during flight missions. The comparison of the results shows the region of validity of both methods and suggests the application of a modified nominal stress methods. Two proposals for improving the nominal stress method by superseding the Neuber-Hyperbolic rule and modifying the mean stress influence in the Goodman diagram are discussed.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Comparison of methods for lifetime calculations of highly loaded aero-engine discs


    Additional title:

    Vergleich von Methoden zur Berechnung der Lebensdauer an hochbelasteten Flugzeugtriebwerksscheiben


    Contributors:
    Hefele, R. (author) / Kappler, G. (author) / Rist, D. (author)

    Published in:

    ASME-Papers ; Jun ; 1-8


    Publication date :

    1986


    Size :

    8 Seiten, 18 Bilder, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Cyclic spinning testing of aero-engine discs

    Aoano, A. / Chikata, T. / Satoh, R. et al. | Tema Archive | 1987



    Aero-engine nacelle and aero-engine

    LIU ZHAO / XU YAN / DING CHEN | European Patent Office | 2022

    Free access

    Aero-engine connecting structure and aero-engine

    LI JING / XU BIN / BAI TAO et al. | European Patent Office | 2021

    Free access

    Life Prediction Algorithms for Aero Engine Discs Based on Crack Initiation and Crack Propagation Models

    Dhondt, G. / Commission of the European Communities | British Library Conference Proceedings | 1993