Contribution à l'étude de l'endommagement de la glace polycristalline en compression uniaxiale PDF Download
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Author: Guy Ouillon
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: Guy Ouillon
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: OLIVIER.. PLE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 232
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Book Description
CE TRAVAIL EST CENTRE SUR L'ETUDE DE LA NUCLEATION DE FISSURES DANS LA GLACE. UNE PARTIE IMPORTANTE DE L'ETUDE A ETE CONSACREE A LA MISE AU POINT D'UNE GLACE ARTIFICIELLE QUI FOURNIT UN MATERIAU BIDIMENSIONNEL IDEAL POUR UN COUPLAGE D'ETUDES EXPERIMENTALES ET THEORIQUES. NOTRE DEMARCHE A CONSISTE A CONDUIRE UNE SERIE D'EXPERIENCES DE FLUAGE SUR CE TYPE DE MATERIAU ET SUR LE TYPE DE GLACE COURAMMENT UTILISE PAR LA COMMUNAUTE DES GLACIOLOGUES. SELON LE NIVEAU DE CONTRAINTE (ENTRE 0,5 ET 1 MPA) LE FLUAGE DE LA GLACE ETAIT ACCOMPAGNE OU NON PAR DE L'ENDOMMAGEMENT. LA PARTIE LA PLUS ORIGINALE DE L'ETUDE EXPERIMENTALE RESIDE DANS L'ANALYSE DES IMAGES VIDEO QUI PERMETTAIT L'ENREGISTREMENT DE L'APPARITION DES FISSURES DANS LE TIERS CENTRAL DES ECHANTILLONS. NOUS AVONS AINSI OBTENU UNE BASE DE DONNEES IMPORTANTE SUR LA TAILLE DES FISSURES, LEUR ORIENTATION ET LEUR LOCALISATION ET SUR LES DEFORMATIONS DE LA GLACE. LA CONFRONTATION DES RESULTATS EXPERIMENTAUX ET DES ANALYSES THEORIQUES NOUS A PERMIS DE RENFORCER NOS CONNAISSANCES SUR LES MECANISMES PHYSIQUES QUI SONT A L'ORIGINE DES PROCESSUS DE DEFORMATION ET DE GERMINATION DE FISSURES DANS LA GLACE DE LAC. ENFIN, EN UTILISANT LE MODELE DE L'INCLUSION D'ESHELBY, DANS LE CADRE D'UN COMPORTEMENT VISCOPLASTIQUE NEWTONIEN, NOUS DISCUTONS UN CRITERE DE NUCLEATION BASE SUR LE FACTEUR D'INTENSITE DE CONTRAINTE EN MODE 1.
Author: Pierre Kalifa
Publisher:
ISBN:
Category :
Languages : fr
Pages : 149
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Book Description
ETUDE DU COMPORTEMENT MECANIQUE DE LA GLACE POLYCRISTALLINE EN COMPRESSION A DES VITESSES DE DEFORMATION CORRESPONDANT A LA TRANSITION DUCTILE-FRAGILE, ETUDE CENTREE SUR 2 POINTS: -1) ETUDE DES PROCESSUS DE NUCLEATION ET DE CROISSANCE DES FISSURES DANS LA GLACE EN COMPRESSION TRIAXIALE; -2) CARACTERISATION DE LA RESISTANCE LIMITE DE LA GLACE ET DE SON ETAT STRUCTURAL AU PIC DE CONTRAINTE. UN MODELE DE NUCLEATION DE FISSURE EST ADAPTE A PARTIR D'UN EMPILEMENT DE DISLOCATION POUR PRENDRE EN COMPTE L'EFFET INHIBITIF DES CONTRAINTES EXTERNES SUR LA CROISSANCE DES FISSURES. LA VARIATION DE LA DENSITE DE FISSURES EST ETUDIEE AU PIC DE CONTRAINTE AVEC LA PRESSION DE CONFINEMENT ET LA VITESSE DE DEFORMATION
Author: Weinong W. Chen
Publisher: Springer Science & Business Media
ISBN: 1441979824
Category : Technology & Engineering
Languages : en
Pages : 390
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Book Description
The authors systematically describe the general principles of Kolsky bars, or split Hopkinson bars, which are widely used for obtaining dynamic material properties. Modifications are introduced for obtaining reliable data. Specific experiment design guidelines are provided to subject the specimen to desired testing conditions. Detailed Kolsky-bar examples are given for different classes of materials (brittle, ductile, soft, etc) and for different loading conditions (tension, torsion, triaxial, high/low temperatures, intermediate strain rate, etc). The Kolsky bars used for dynamic structural characterization are briefly introduced. A collection of dynamic properties of various materials under various testing conditions is included which may serve as a reference database. This book assists both beginners and experienced professionals in characterizing high-rate material response with high quality and consistency. Readers who may benefit from this work include university students, instructors, R & D professionals, and scholars/engineers in solid mechanics, aerospace, civil and mechanical engineering, as well as materials science and engineering.
Author: Erland M. Schulson
Publisher: Cambridge University Press
ISBN: 0521806208
Category : Science
Languages : en
Pages : 403
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Book Description
The first complete account of the physics of the creep and fracture of ice, for graduates, engineers and scientists.
Author: David M. Cole
Publisher:
ISBN:
Category : Acoustic emission
Languages : en
Pages : 92
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Book Description
This work presents the results of a study to examine the effects of grain size of internal microfractures in polycrystalline ice. Laboratory-prepared specimens were tested under uniaxial, constant-load creep conditions at -5 C. Grain size ranged from 1.5 to 6.0 mm. This range of grain size, under an initial creep stress of 2.0 MPa, led to a significant change in the character of deformation. The finest-grained material displayed no internal cracking and typically experienced strains of 10 to the minus 2nd power at the minimum creep rate epsilon. The coarse-grained material experienced severe cracking and a drop in the strain at epsilon min to approximately 4x10 to the minus 3rd power. Extensive post-test optical analysis allowed estimation of the size distribution and number of microcracks in the tested material. These data led to the development of a relationship between the average crack size and the average grain size. Additionally, the crack size distribution, when normalized to the grain diameter, was very similar for all specimens tested. The results indicate that the average crack size is approximately one-half the average grain diameter over the stated grain size range. A dislocation pileup model is found to adequately predict the onset of internal cracking. The work employed acoustic emission techniques to monitor the fracturing rate occurred. Other topics covered in this report include creep behavior, crack healing, the effect of stress level on fracture size and the orientation of cracked grains. Theoretical aspects of the grain size effect on material behavior are also given.
Author: James S. Walker
Publisher: CRC Press
ISBN: 9780849382765
Category : Mathematics
Languages : en
Pages : 168
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Book Description
The rapid growth of wavelet applications-speech compression and analysis, image compression and enhancement, and removing noise from audio and images-has created an explosion of activity in creating a theory of wavelet analysis and applying it to a wide variety of scientific and engineering problems. It becomes important, then, that engineers and scientists have a working understanding of wavelets. Until now, however, the study of wavelets has been beyond the mathematical grasp of many who need this understanding. Most treatments of the subject involve ideas from functional analysis, harmonic analysis, and other difficult mathematical techniques. Wavelets and their Scientific Applications offers an introduction to wavelet analysis without mathematical rigor, requiring only algebra and some very basic calculus. The author stresses applications, and explains, using elementary algebra, how wavelet methods are typically applied in analyzing digital data. Software is available for download through CRC's Website that will enable recording, playing, and modifying sound files, and includes a facility for displaying, printing and modifying IEEE gray field images. Unlike other software packages for wavelet analysis, the author developed this attractive, easy-to-use software without the need for a C++ compiler or MATLABä. Throughout the book the author provides numerous suggestions for computer experiments designed to challenge and enhance the reader's comprehension and provide practice in applying the concepts learned. Wavelets and their Scientific Applications thus provides the perfect vehicle for understanding wavelets and their uses. It provides a fast-track learning opportunity for scientists and mathematicians unfamiliar with wavelet concepts and applications, and it is ideal for anyone without an extensive mathematical background.
Author: Lars Arnberg
Publisher:
ISBN: 9783038356400
Category : Liquid alloys
Languages : en
Pages : 0
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Book Description
The research on metals in their liquid state has been underestimated for a long time and the specific literature was scarce compared to those regarding solid metals. In the last twenty years, the situation has progressively changed and the matter has emerged as a fundamental area of investigation for physicists, metallurgists and materials scientists with consequent achievement of relevant results both on basic and applicative aspects. Today the description and the characterisation of molten metals and alloys is a wide and interdisciplinary topic and involves different approaches, from physics to technology, from processing to modelling.The book is structured in review and research papers and offers the state-of-the-art information on physics, technological properties, processing and modelling of physical and technological behaviour of liquid metals and alloys
