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Book Description
CETTE ETUDE SE SITUE DANS LE CADRE DE L'ENDOMMAGEMENT ET DU CUMUL DE DOMMAGE EN FATIGUE A DEUX NIVEAUX DE CHARGEMENT, EN FLEXION ROTATIVE, JUSQU'A L'AMORCAGE D'UNE MACROFISSURE, SUR DES EPROUVETTES EN ACIER 35CD4 TREMPE-REVENU. LA CONFRONTATION DES MODELES D'ENDOMMAGEMENT PROPOSES DANS LA LITTERATURE, AVEC LES RESULTATS D'ESSAIS OBTENUS EN LABORATOIRE SUR DES ECHANTILLONS CONTENANT UN NOMBRE ASSEZ IMPORTANT D'EPROUVETTES, MET EN LUMIERE DES DIFFICULTES PROVENANT DE LA DISPARITE DES DUREES DE VIE. NOUS AVONS PROPOSE UNE DEMARCHE DE TRAITEMENT STATISTIQUE DITE DES CLASSES UTILISABLES ASSOCIEE A UNE NOUVELLE METHODOLOGIE D'ESSAIS. ELLE PERMET, APRES ESSAIS D'ECHANTILLONS DE MEME NOMBRE D'EPROUVETTES TIREES AU SORT, DE PARTAGER CHACUN D'EUX EN CLASSES D'EPROUVETTES DE PERFORMANCES VOISINES. LA DISPERSION ETANT REDUITE, LE COMPORTEMENT PAR CLASSE EST CONNU AVEC PRECISION. CETTE METHODE PERMET D'APPLIQUER LES MODELES D'ENDOMMAGEMENT AVEC PLUS DE RIGUEUR. DANS LA SUCCESSION DES CHARGEMENTS, NOUS DISTINGUONS DEUX CAS: NIVEAUX VOISINS, NIVEAUX ECARTES. DANS LE PREMIER CAS, LES MODELES D'ENDOMMAGEMENT DONNENT DES RESULTATS ASSEZ FIABLES. CEPENDANT, ILS NE PERMETTENT PAS DE TRADUIRE CORRECTEMENT LE COMPORTEMENT DU MATERIAU QUAND LES NIVEAUX SONT ESPACES. A PARTIR DES RESULTATS D'ESSAIS OBTENUS DANS CE DERNIER CAS, NOUS AVONS DEGAGE LA NOTION DE MATERIAUX FICTIFS ISSUS D'UN MEME MATERIAU REEL, PERMETTANT AINSI DE PRENDRE EN COMPTE LE COMPORTEMENT DIFFERENT DES CLASSES. DE PLUS, NOUS AVONS MIS EN EVIDENCE L'IMPORTANCE DE LA LIMITE D'ENDURANCE POUR MODELISER L'ENDOMMAGEMENT
Book Description
CETTE ETUDE SE SITUE DANS LE CADRE DE L'ENDOMMAGEMENT ET DU CUMUL DE DOMMAGE EN FATIGUE A DEUX NIVEAUX DE CHARGEMENT, EN FLEXION ROTATIVE, JUSQU'A L'AMORCAGE D'UNE MACROFISSURE, SUR DES EPROUVETTES EN ACIER 35CD4 TREMPE-REVENU. LA CONFRONTATION DES MODELES D'ENDOMMAGEMENT PROPOSES DANS LA LITTERATURE, AVEC LES RESULTATS D'ESSAIS OBTENUS EN LABORATOIRE SUR DES ECHANTILLONS CONTENANT UN NOMBRE ASSEZ IMPORTANT D'EPROUVETTES, MET EN LUMIERE DES DIFFICULTES PROVENANT DE LA DISPARITE DES DUREES DE VIE. NOUS AVONS PROPOSE UNE DEMARCHE DE TRAITEMENT STATISTIQUE DITE DES CLASSES UTILISABLES ASSOCIEE A UNE NOUVELLE METHODOLOGIE D'ESSAIS. ELLE PERMET, APRES ESSAIS D'ECHANTILLONS DE MEME NOMBRE D'EPROUVETTES TIREES AU SORT, DE PARTAGER CHACUN D'EUX EN CLASSES D'EPROUVETTES DE PERFORMANCES VOISINES. LA DISPERSION ETANT REDUITE, LE COMPORTEMENT PAR CLASSE EST CONNU AVEC PRECISION. CETTE METHODE PERMET D'APPLIQUER LES MODELES D'ENDOMMAGEMENT AVEC PLUS DE RIGUEUR. DANS LA SUCCESSION DES CHARGEMENTS, NOUS DISTINGUONS DEUX CAS: NIVEAUX VOISINS, NIVEAUX ECARTES. DANS LE PREMIER CAS, LES MODELES D'ENDOMMAGEMENT DONNENT DES RESULTATS ASSEZ FIABLES. CEPENDANT, ILS NE PERMETTENT PAS DE TRADUIRE CORRECTEMENT LE COMPORTEMENT DU MATERIAU QUAND LES NIVEAUX SONT ESPACES. A PARTIR DES RESULTATS D'ESSAIS OBTENUS DANS CE DERNIER CAS, NOUS AVONS DEGAGE LA NOTION DE MATERIAUX FICTIFS ISSUS D'UN MEME MATERIAU REEL, PERMETTANT AINSI DE PRENDRE EN COMPTE LE COMPORTEMENT DIFFERENT DES CLASSES. DE PLUS, NOUS AVONS MIS EN EVIDENCE L'IMPORTANCE DE LA LIMITE D'ENDURANCE POUR MODELISER L'ENDOMMAGEMENT
Author: Christian Lalanne Publisher: John Wiley & Sons ISBN: 1848216475 Category : Science Languages : en Pages : 534
Book Description
Fatigue damage in a system with one degree of freedom is one of the two criteria applied when comparing the severity of vibratory environments. The same criterion is also used for a specification representing the effects produced by the set of vibrations imposed in a real environment. In this volume, which is devoted to the calculation of fatigue damage, Christian Lalanne explores the hypotheses adopted to describe the behavior of material affected by fatigue and the laws of fatigue accumulation. The author also considers the methods for counting response peaks, which are used to establish the histogram when it is not possible to use the probability density of the peaks obtained with a Gaussian signal. The expressions for mean damage and its standard deviation are established and other hypotheses are tested.
Author: Christi Lalanne Publisher: CRC Press ISBN: 9781560329893 Category : Art Languages : en Pages : 376
Book Description
About the Series: This important new series of five volumes has been written with both the professional engineers and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and crucially important areas of mechanical engineering, from both the theoretical and practical standpoints. As all products need to be designed to withstand the environmental conditions to which they are likely to be subjected, prototypes must be verified by calculation and laboratory tests, the latter according to specifications from national or international standards. The concept of tailoring the product to its environment has gradually developed whereby, from the very start of a design project, through the to the standards specifications and testing procedures on th e prototype, the real environment in which the product being tested will be functioning is taken into account. The five volumes of Mechanical Shock and Vibration cover all the issues that need to be addressed in this area of mechanical engineering. The theoretical analyses are placed in the context of the real world and of laboratory tests - essential for the development of specifications. Volume IV: Fatigue Damage Fatigue damage in a system with one degree of freedom is one of the two criteria applied when comparing the severity of vibratory environments. The same criterion is also employed for a specifciation representing the effects produced by the set of vibrations imposed in a real environment. In this volume, which is devoted to the calculation of fatigue damage, the author explores the hypotheses adopted to describe the behavior of material suffering fatigue and the laws of fatigue accumulation. He also considers the methods of counting the response peaks, which are used to establish the histogram when it is impossible to use the probability density of the peaks obtained with a Gaussian signal. The expressions for mean damage and its standard deviation are established and other hypotheses are tested.
Author: J. Hult Publisher: Springer Science & Business Media ISBN: 3642815820 Category : Science Languages : en Pages : 298
Book Description
The Symposium was initiated in 1977 by Dr. M.G. CHABERT, Directeur des plans et programmes du C.E.T.I.M. His death, which occurred a few weeks before the Symposium, was deeply felt by all participants, who decided to dedicate this volume to his memory. The purpose, as set out by Dr. CHABERT, was to bring together people speaking the language of research and the language of industry in discussing problems of structural analysis. The Centre Technique des Industries M~caniques (C.E.T.I.M.) at Sen1is was considered a suitable place for organizing such a meeting. Modern structural analysis, aided by high speed computers, is mainly concerned with non-linear phenomena, such as plasticity, visco-plasticity, damage and fracture mecha nics. Scientists involved in research in this field also speak two different languages: that of material analysts and that of structural analysts. The Bureau of IUTAM had appointed the following Scientific Committee to implement the ideas proposed by Dr. CHABERT: J. LEMAITRE, Universite Paris VI, ENSET, Cachan, France Chairman J. HULT, Chalmers University of Technology, Gothenburg, Sweden, Co-Chairman G. CHABERT, Centre Technique des Industries M~caniques, Sen1is, France F.A. LECKIE, University of Illinois, Urbana, Illinois, USA G. MAIER, Istituto di Scienza e Technica delle Costruzi oni, Po1otechnico di Milano, Italy Z. MROZ, Polish Academy of Sciences, Warsaw, Poland G.S.
Book Description
SYSTEME EPOXY-VERRE. ROLE DES INTERFACES. CARACTERISATION EN FATIGUE PAR FLEXION DE DIFFERENTS COMPOSITES. CAS LIMITE DE LA FATIGUE STATIQUE
Author: Fatima Zaima Choukari
Author: Fatima Zaima Choukari
Author: Fatima Z.. Choukairi
Author: Christian Lalanne
Author: Christi Lalanne
Author: Anton Puškár
Author: J. Hult
Author: Institution of Mechanical Engineers (Great Britain)
Author: Christian Lalanne
Author: Pascale Puget
Author: