To satisfy the high demands in view of technical reliability, weight, power, economic efficiency and lifetime of modern aero engines, it is essential to benefit from the full potential of the employed materials. In this respect, residual stresses in the bulk of components are of considerable importance as they have e.g. a strong influence on component distortions during the whole manufacturing process and therefore also on the efficiency of these processes. The measurement of residual stresses using ultrasound in the bulk of materials is a fast and nondestructive method, already well-established for steel components. Thus, the aim of our research was to test whether the ultrasonic stress measurement method is also applicable for nickel- and titanium-based alloys used in aero engine manufacturing. In this contribution we report on basic investigations performed with regard to the achievable measuring effects. In uniaxial tensile tests we determined the time-of-flight sensitivity of different ultrasonic waves in dependence of the applied stresses. Based on these results we have calculated weighting factors describing the correlation between the change in stresses and the change in the velocities of longitudinal waves and of shear waves with different polarization directions with respect to the applied stresses. The test specimens were taken from different regions of a single forging made of Inconel 718. To investigate the effect of texture on the measurement results, some of the samples have been subjected to heat treatments. In our contribution we give a short overview over the basic principles of the ultrasonic method, we illustrate the modification and assembly of a high-precision ultrasound time-of-flight measurement system and we analyse the results with respect to future work.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Basic investigations to establish an ultrasonic stress evaluation technique for aero engine materials




    Publication date :

    2012


    Size :

    8 Seiten, 6 Bilder, 5 Tabellen, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




    Aero Engine Materials

    Bhat, Biliyar N. | AIAA | 2018


    Aero-engine nacelle and aero-engine

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

    Free access

    Trends in aero-engine materials

    Gabrielli, G. | Tema Archive | 1984


    Advances in Aero Engine Materials

    Glover, N. / Royal Aeronautical Society | British Library Conference Proceedings | 2007


    Plasma Welding of aero engine materials

    Beauchamp, D.J. | Tema Archive | 1975