Effects of LCF Loadings on the HCF Life of Notched Specimens in Ferritic-Bainitic Steel*

Extended Version of the Contribution to the International Conference on Low Cycle Fatigue (LCF 6).

Hadrien Bidouard obtained a Master of Research in the field of mechanics and material at the University of Paris XI in 2005, he is preparing a PhD thesis about ‟Overload effect on fatigue life of ferritic-bainitic steel under variable amplitude loading”. He worked as a Research Engineer during his PhD preparation at the Renault Technocentre (Guyancourt, France).

Prof. Dr.-Ing. Thierry Palin-Luc obtained an engineering diploma at ENSAM in 1991, he prepared a PhD thesis about ‟The multiaxial fatigue of spheroidal graphite cast iron under combined loadings” (defended in 1996). From 1997 to 2008, he was assistant professor at LAMEFIP ENSAM. He is full professor at Arts et Métiers ParisTech since September 2008. From 2004, he is the head of the „Fatigue of Materials and Structures‟ activity of LAMEFIP. From 2005 Prof. Palin-Luc is Deputy Director of this laboratory, his research activities are on the multiaxial fatigue of materials and structures. He has developed volumetric energy based multiaxial fatigue models, and he studies interaction between the fatigue life of structures and manufacturing processes.

Dr. Ing. Nicolas Saintier is assistant professor at the Department of Mechanical Engineering of Arts et Métiers ParisTech since 2004. He obtained his doctoral degree from the Ecoles Des Mines in 2001 in the field of multiaxial fatigue. His research activities concern the development of fatigue criteria under complex loading (variable amplitude non proportional loadings) for metallic and non-metallic materials (polymers, rubber). His latest research interests are focussed on further understanding the link beween microstructure and fatigue damage processes in order to propose tools for process optimization towards fatigue resistance.

Dipl.-Ing. Christian Dumas has obtained his diploma in 1990. He works at Renault SAS since 1996. After being in charge of cold forming process simulation and fatigue design at the Engine Department, he became responsible for fatigue testing team at Materials Engineering Department of Renault Guyancourt in 2002. The activity concerns the characterization of materials for Engine and Vehicle design, the development of fatigue criteria under multi axial fatigue on metallic and polymers parts.

Dr. Heinz Kaufmann studied Mechanical Engineering at the Technical University Darmstadt (TUD). In 1986 he joined the Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt, Germany, where he worked on the fatigue behaviour of cast materials (aluminium, magnesium, thin- and thick-walled ductile cast iron), forged steels and welded joints (steel/aluminium). He presented his doctoral thesis on ‘The Dimensioning of Cyclically-Loaded Thick-Walled Components of Cast Ductile Iron GGG-40 Considering Microstructural Degenerations from Casting’ at Saarbruecken University in 1998. Since 2003 he is head of the Competence Center „Component-Related Material Behaviour‟. The tasks of the Competence Center are the experimental and numeric analysis of the fatigue properties of materials und structures considering the manufacturing technologies, loading and environmental conditions.

Dipl.-Ing. Chalid el Dsoki studied Mechanical Engineering at the Technical University Hannover and the Technical University of Berlin. Subject of his diploma thesis was „Simulation of an Otto-Engine‟. Since mid of 2005 he is with the Fraunhofer Institute for Structural Durability and System Reliability LBF as well as with the Technical University of Darmstadt in the Department System Reliability and Machine Acoustics SzM. Actually he is working on the topics cold forming, neural networks, and material laws for describing the elastic-plastic fatigue behaviour.

Prof. Dr.-Ing. Cetin Morris Sonsino studied Mechanical Engineering at the Technical University Darmstadt (TUD) and works at the Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF in Darmstadt since 1973. He achieved his doctoral degree in the field of cold forming and low-cycle fatigue in 1982. Since 1990 he is lecturing at the Saarland University, and since 2002 also at the Technical University Darmstadt the course Structural Durability — Component Related Material Behaviour. Prof. Sonsino is chairman of the DVM working group Structural Durability and is deputy director of the LBF.