Download or read book Mod lisation num rique de la cristallisation induite par l coulement d un thermoplastique written by Amine Ammar and published by . This book was released on 2001 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous nous intéressons dans ce travail au développement d'un modèle de cristallisation afin de simuler la phase de remplissage lors de l'injection d'un thermoplastique. La cinétique de changement de phase est affectée par l'histoire thermomécanique subie par le matériaux. Nous développons alors dans le cadre des matériaux standards généralises un modèle qui permet de prédire la cristallisation induite par l'écoulement d'un polymère. Nous utilisons d'abord ce modèle avec des comportements visqueux. Pour étudier l'effet de l'orientation et de l'étirement moléculaire sur l'écoulement et sur la cinétique de cristallisation, nous utilisons ensuite le modèle pompom (modèle de comportement viscoélastique de polymères ramifies). A l'aide d'une technique de partition des déformations nous montrons par des simulations numériques l'effet viscoélastique sur le champ de vitesse, d'étirement et de contraintes notamment en présence de singularités géométriques. Enfin, dans le but d'étendre le modèle de cristallisation induite aux comportements viscoélastiques, nous proposons un cadre qui permet l'écriture thermodynamique des modèles viscoélastiques en grandes transformations. Les résultats d'une simulation numérique d'injection montrent l'effet de l'étirement et de l'orientation moléculaire sur l'apparition de la cristallisation induite.
Download or read book Prediction of Defects in Material Processing written by M. Predeleanu and published by Elsevier Science & Technology. This book was released on 2004 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taken from a September 2002 international conference, 31 selected papers consider methods for predicting and avoiding the occurrence of defects in manufactured products. Major topics include microstructural evolutions during processing, induced properties in materials, damage modeling and fracture criteria, instability analysis, characterization of formability, predictive methods and numerical techniques, and the influence of defects on the integrity of structures. The volume covers metal alloys, ceramics, polymers, and composites and both conventional and new materials are discussed. Distributed in the U.S. by Stylus Publishing. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).
Download or read book Proceedings of the 6th ESAFORM Conference on Material Forming written by Valerio Brucato and published by . This book was released on 2003 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Caract risation en temps r el de la cristallisation induite lors de la d formation d un thermoplastique written by Fahmi Chaari and published by . This book was released on 2004 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse propose de nouvelles méthodes de caractérisation de la cristallisation induite par l'écoulement des polymères semi cristallins. Des mesures rhéo-optiques ont d'abord permis de suivre les différents changements de microstructure durant la cristallisation à partir de l'état fondu. Celle-ci cristallisation se développe en trois étapes différentes: une nucléation, une phase de croissance isotrope et une deuxième phase où la croissance devient anisotrope. Cette étude a permis de vérifier que les mesures optiques sont capables de caractériser la cristallisation. Cependant, ce type de mesure n'est pas capable de différencier quantitativement les différentes phases du polymère. Nous nous sommes alors intéressés à la diffraction de rayons X afin d'obtenir cette différenciation de manière quantitative. Nous avons réalisé des essais de traction sur des polymères à l'état caoutchoutique et observé en temps réel l'évolution de leurs phases cristallines. La comparaison avec le comportement mécanique montre que le durcissement généralement observé pour ces polymères semi cristallins provient essentiellement de l'étirement des chaînes amorphes entre les cristallites. La même géométrie de déformation a été utilisée pour effectuer des mesures des propriétés optiques lors de la cristallisation à partir de l'état caoutchoutique. La correlation de ces mesures avec la diffraction X permet de differencier la contribution de chaque phase du polymère
Download or read book Etude exp rimentale et simulation num rique de l coulement convectif d la cristallisation d un sel en milieu confin written by Jean-Michel Chérel and published by . This book was released on 1985 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST UNE DETERMINATION EXPERIMENTALE DU CHAMP DE VITESSES ET DE CONCENTRATIONS DANS UNE CELLULE INCLINEE OU CROIT UN CRISTAL A PARTIR D'UNE SOLUTION AQUEUSE DE NACLO::(3). ON OBSERVE UNE DESTABILISATION MORPHOLOGIQUE DE L'INTERFACE CRISTAL SOLUTION, DUE A LA PERSISTANCE D'UN GRADIENT DE CONCENTRATION PROVOQUE PAR L'APPAUVRISSEMENT DE LA SOLUTION QUAND ELLE PARCOURT LE CRISTAL. A FORT RAYLEIGH LE REGIME HYDRODYNAMIQUE DEVIENT INSTABLE. LA SIMULATION NUMERIQUE, PAR UN CODE UTILISANT LES METHODES SPECTRALES DONNE DES RESULTATS EN ACCORD TRES SATISFAISANTS AVEC L'EXPERIENCE: CHAMP DE VITESSES ET DE CONCENTRATIONS, BAISSE DE SURSATURATION LE LONG DE LA FACE, INSTABILITES HYDRODYNAMIQUES
Download or read book Heat Transfer in Polymer Composite Materials written by Nicolas Boyard and published by John Wiley & Sons. This book was released on 2016-03-28 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses general information, good practices and examples about thermo-physical properties, thermo-kinetic and thermo-mechanical couplings, instrumentation in thermal science, thermal optimization and infrared radiation.
Download or read book Composite Materials written by Jean-Marie Berthelot and published by Springer. This book was released on 2013-02-06 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical engineering, an engineering discipline borne of the needs of the in dustrial revolution, is once again asked to do its substantial share in the call for industrial renewal. The general call is urgent as we face profound issues of produc tivity and competitiveness that require engineering solutions, among others. The Mechanical Engineering Series features graduate texts and research monographs intended to address the need for information in contemporary areas of mechanical engineering. The series is conceived as a comprehensive one that covers a broad range of concentrations important to mechanical engineering graduate education and re search. We are fortunate to have a distinguished roster of consulting editors on the advisory board, each an expert in one of the areas of concentration. The names of the consulting editors are listed on the next page of this volume. The areas of concentration are applied mechanics, biomechanics, computational mechan ics, dynamic systems and control, energetics, mechanics of materials, processing, thermal science, and tribology.
Download or read book Strength of Materials and Structural Components written by Mohammed Abbadi and published by Trans Tech Publications Ltd. This book was released on 2019-09-04 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This special issue contains articles from the field of the strength of materials and structural components, additive manufacturing, and testing and modeling methods in materials science. We hope this volume will be interesting for many engineers from the area of machinery.
Download or read book Thermal Nanosystems and Nanomaterials written by Sebastian Volz and published by Springer Science & Business Media. This book was released on 2009-12-24 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer laws for conduction, radiation and convection change when the dimensions of the systems in question shrink. The altered behaviours can be used efficiently in energy conversion, respectively bio- and high-performance materials to control microelectronic devices. To understand and model those thermal mechanisms, specific metrologies have to be established. This book provides an overview of actual devices and materials involving micro-nanoscale heat transfer mechanisms. These are clearly explained and exemplified by a large spectrum of relevant physical models, while the most advanced nanoscale thermal metrologies are presented.
Download or read book Dynamic Behavior of Materials Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Download or read book Geology and Geotechnical Properties of Laterite Gravel written by Ellis L. Krinitzsky and published by . This book was released on 1976 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Download or read book Advanced Composite Materials and Structures written by Mohamed Thariq Hameed Sultan and published by CRC Press. This book was released on 2022-08-31 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book bridges the gap between theoretical concepts and their implementations, especially for the high-performance structures/components related to advanced composite materials. This work focuses on the prediction of various structural responses such as deformations, natural frequencies etc. of advanced composites under complex environments and/or loading conditions. In addition, it discusses micro-mechanical material modeling of various advanced composite materials that involve different structures ranging from basic to advanced, such as beams, flat and curved panels, shells, skewed, corrugated, and other materials, as well as various solution techniques via analytical, semi-analytical, and numerical approaches. This book: Covers micro-mechanical material modeling of advanced composite materials Describes constitutive models of different composite materials and kinematic models of different structural configuration Discusses pertinent analytical, semi-analytical, and numerical techniques Focusses on structural responses relating to deformations, natural frequencies, and critical loads under complex environments Presents actual demonstrations of theoretical concepts as applied to real examples using Ansys APDL scripts This book is aimed at researchers, professionals, and graduate students in mechanical engineering, material science, material engineering, structural engineering, aerospace engineering, and composite materials.
Download or read book Scientific Canadian Mechanics Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanosciences and Nanotechnology written by Jean-Michel Lourtioz and published by Springer. This book was released on 2015-10-07 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides information to the state of art of research in nanotechnology and nano medicine and risks of nano technology. It covers an interdisciplinary and very wide scope of the latest fundamental research status and industrial applications of nano technologies ranging from nano physics, nano chemistry to biotechnology and toxicology. It provides information to last legislation of nano usage and potential social impact too. The book contains also a reference list of major European research centers and associated universities offering licences and master of nano matter. For clarity and attractivity, the book has many illustrations and specific inserts to complete the understanding of the scientific texts.
