AXIAL CYCLIC BEHAVIOR AND FATIGUE AFTER TORSIONAL PRE-HARDENING FOR A 304L SS

Autor: Belattar, Adel, Taleb, Lakhdar, Taheri, Said
Přispěvatelé: Groupe de physique des matériaux (GPM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Laboratoire de Mécanique des Structures Industrielles Durables, EDF (EDF), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), BELATTAR, Adel
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: 18th International Symposium on Plasticity and its current applications-Plasticity'2012, Jan 2012, San Juan, PR, United States.
18th International Symposium on Plasticity and its current applications-Plasticity'2012, Jan 2012, San Juan, PR, United States., Jan 2012, San Juan, PR, United States. pp.3
Popis: International audience; -At room temperature, shear strain control cycles were applied in four loading sequences with increasing/decreasing Von Mises equivalent amplitudes on the same specimen made up of 304L SS. Stress-strain responses show that cyclic curve is not unique. The one obtained in a second sequence is located above that obtained after the first sequence. However, the difference is smaller after the following sequences. Fatigue life is significantly reduced by the previous pre-hardening, such effect is reduced when the applied amplitude during the fatigue tests is high. INTRODUCTION: To determine the required parameters for the reliable and accurate prediction of fatigue life, the effect of prior straining on the subsequent cyclic behavior and fatigue, with or without mean stress and strain, must be considered. This work is a continuation of a previous research performed by Kpodekon and al. [2010]; where, fatigue tests were executed under strain or stress control on virgin and prehardened specimens using monotonic and cyclic pre-hardening. In this previous study, four configurations of the last point of the pre-hardening in the axial stress-strain loops were considered. The mean stress may be positive or negative depending on the location of these breakpoints. The obtained results show that fatigue life is strongly influenced by prehardening; it appears beneficial when the fatigue test is executed under stress control but detrimental in strain-control. It appears for both prehardening modes that the presence of mean stress in the fatigue cycles has a significant effect on fatigue life. Therefore, our objective here is to study the effect of a pre-hardening in the shear direction on the fatigue in the axial direction at zero shear stress and strain. The comparison with the axial pre-hardening will be given later in a full length paper.
Databáze: OpenAIRE
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