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Critical plane concept and energy approach in multiaxial fatigue

This contribution represents an extended version of a keynote given during the 7th International Conference on Biaxial/Multiaxial Fatigue and Fracture (7th ICBMFF)
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Published/Copyright: May 28, 2013
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Abstract

This paper aims to propose a new interpretation of several energy-based critical plane high cycle fatigue criteria. More exactly, the meaning of several global energy-based criteria is detailed from the calculation of normal and shear work on a critical plane. This study is limited to multiaxial fatigue under constant amplitude and synchronous loadings (proportional or non-proportional), with or without mean load. After a short review of some energy-based criteria using the critical plane concept or a global approach, the reasons why energy-based critical plane criteria are more and more developed in literature are summarized. It is shown that a direct link exists between critical plane energy parameters and global ones. A critical examination of the famous Findley et al. experiments is proposed and the previous link is illustrated with two mesoscopic criteria developed by Papadopoulos and the global energy-based criterion of Banvillet et al. This leads us to propose an interpretation of fatigue crack initiation from the mesoscopic scale up to the macroscopic scale either with stress and strain quantities or with strain energy parameters.

Kurzfassung

Der vorliegende Beitrag zielt auf eine neue Interpretation verschiedener energiebasierender ebener Kriterien für die Ermüdung bei hohen Lastwechseln. Genauer gesagt wird die Bedeutung verschiedener globaler ebener energiebasierender Kriterien aus Berechnungen der Normal- und Scherbeanspruchung einer kritischen Ebene detailliert. Die Betrachtung ist begrenzt auf die mehrachsige Ermüdung bei konstanter Amplitude und synchroner proportionaler und nicht proportionaler Beanspruchung, mit und ohne Hauptbeanspruchung. Nach einem kurzen Überblick einiger energiebasierender Kriterien unter Nutzung des Konzepts der kritischen Ebene oder eines globalen Ansatzes werden die Gründe dafür, warum die energiebasierenden Kriterien kritischer Ebenen in der Literatur immer weiter entwickelt werden, aufgezeigt. Es wird gezeigt, dass eine direkte Verbindung zwischen den Parametern der Energie kritischer Ebenen und globalen Parametern existiert. Es wird eine kritische Untersuchung der berühmten Experimente von Finley et al. vorgenommen und die angesprochene Verbindung wird anhand zweier von Papadopoulos entwickelten mesoskopischen Kriterien und dem auf der globalen Energie basierten Kriterium nach Banvillet et al. Beleuchtet. Dies führt zur Annahme, dass die Initiierung von Ermüdungsrissen von der mesoskopischen bis zur makroskopischen Betrachtung entweder mittels Spannungs- oder Dehnungsteilen oder mittels verformungsenergetischen Parametern interpretiert werden kann.


Dr. Thierry Palin-Luc was born in 1968. After obtained an engineering diploma at E.N.S.A.M. in 1991, he prepared a PhD thesis at LAMEFIP about the multiaxial fatigue of spheroidal graphite cast iron under combined loadings (defended in 1996). Since 1997, he has been an assistant professor in this laboratory. He works on multiaxial fatigue of materials and structures and developed volumetric energy-based multiaxial fatigue models.

Dr. Franck Morel was born in 1967. After obtained an engineering diploma at C.E.S.T.I. (SupMéca) in 1991, he wrote a PhD thesis at Poitiers (LMPM) about multiaxial loading under variable amplitude loading (defended in 1996). Since 1997, he has been an assistant professor first in Poitiers and now in Angers (ENSAM). His main fields of research are fatigue under complex loading and the influence of the material processing on the fatigue properties.


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Published Online: 2013-05-28
Published in Print: 2005-05-01

© 2005, Carl Hanser Verlag, München

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