On the mechanism of fatigue crack propagation in ductile metallic materials

Authors

  • R. PIPPAN,

    1. Erich Schmid Institute of Materials Sciences, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria
    2. Christian Doppler Labor für die lokale Analyse von Verformung und Bruch, Jahnstrasse 12, A-8700 Leoben, Austria
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  • C. ZELGER,

    1. Christian Doppler Labor für die lokale Analyse von Verformung und Bruch, Jahnstrasse 12, A-8700 Leoben, Austria
    2. AMAG, A-5282 Ranshofen, Austria
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  • E. GACH,

    1. Böhler Edelstahl, Mariazeller Str 25, A-8605 Kapfenberg, Austria
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  • C. BICHLER,

    1. Erich Schmid Institute of Materials Sciences, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria
    2. Plansee Metall GmbH u Plansee GmbH, A-6600 Mühl bei Reutte, Austria
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  • H. WEINHANDL

    1. Erich Schmid Institute of Materials Sciences, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria
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  • Note: This manuscript was originally compiled for a Special Issue by Prof. C. Rodopoulos and Prof. Sp. Pantelakis based on the ‘1st International Conference of Engineering against Fracture’.

Correspondence: R. Pippan. E-mail: reinhard.pippan@oeaw.ac.at

ABSTRACT

An overview of our research performed during the last 15 years is presented to improve the understanding of fatigue crack propagation mechanisms. The focus is devoted to ductile metals and the material separation process at low and intermedial crack propagation rates. The effect of environment, short cracks, small-scale yielding as well as large-scale yielding are considered. It will be shown that the dominant intrinsic propagation mechanism in ductile metallic materials is the formation of new surface due to blunting and the re-sharpening during unloading. This process is affected by the environment, however, not by the length of the crack and it is independent of large- or small-scale yielding.

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