Modélisation et caractérisation de l'aptitude à la déformation tridimensionnelle des structures souples PDF Download

Author: Ilyes Ben Naceur
Publisher:
ISBN:
Category :
Languages : fr
Pages : 166

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La mise en forme des étoffes nécessite une bonne connaissance du comportement mécanique et thermique. Dans ce cadre, une étude expérimentale permet de caractériser le comportement mécanique en traction uniaxiale et biaxiale dans le but de déterminer l’aptitude à la déformation de l’étoffe tout en tenant compte de l’effet du lavage sur le retour élastique. Une approche mésoscopique discrète est proposée pour la modélisation de la capacité de déformation de l’étoffe avec un comportement élastique non linéaire. Dans cette approche, l’étoffe est discrétisée par éléments finis de barre et de membrane pour tenir compte de son hétérogénéité. Une deuxième approche macroscopique continue basée sur la méthode des éléments finis est également proposée pour tenir compte de l’effet biaxial. Des exemples de mise en forme ont été réalisés pour tester la capacité de l’étoffe en déformation tridimensionnelle et également pour tester la faisabilité de la forme géométrique souhaitée. Dans ce cadre, un outil de remaillage adaptatif est développé pour mener les calculs au bout

Author: Ilyes Ben Naceur
Publisher: Presses Academiques Francophones
ISBN: 9783838149394
Category :
Languages : fr
Pages : 196

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La mise en forme des structures souples, tel que les etoffes, necessite la connaissance de leurs comportements mecanique et thermique. Une etude experimentale permet de caracteriser le comportement mecanique en traction simple et biaxiale et l'aptitude a la deformation de l'etoffe. De meme une etude thermique permet de modeliser l'influence des parametres temps et temperature par rapport a la thermofixation de l'etoffe tout en tenant compte de l'effet du lavage sur le retour elastique. Pour la modelisation de la capacite de deformation de l'etoffe, une approche mesoscopique discrete est proposee avec un comportement elastique non lineaire. Pour cette approche, l'etoffe est discretisee par des elements finis barres et membranes pour tenir compte de l'heterogeneite. La deuxieme approche proposee est basee sur la methode des elements finis UEL developpes pour tenir compte de l'effet biaxial. Enfin, des simulations de mise en forme sont proposees pour valider les modeles et tester la capacite de deformation tridimensionnelle de l'etoffe.

Author: Télesphore Sime-Ngando
Publisher: Springer
ISBN: 3319399616
Category : Science
Languages : en
Pages : 422

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This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.

Author: Buddhima Indraratna
Publisher: CRC Press
ISBN: 9780415383295
Category : Technology & Engineering
Languages : en
Pages : 248

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In this book, the authors discuss testing of ballast, including the strength, deformation and degradation aspects of fresh and recycled ballast under monotonic and cyclic loading. The effectiveness of geosynthetics in stabilising recycled ballast has also been examined. A new stress-strain constitutive model for ballast incorporating particle breakage is presented. Finally, a new range of particle gradations, balancing the strength and permeability requirements, has been proposed for future rail tracks. This book is intended as a reference text for final year civil engineering students and postgraduates, and for practicing railway engineers with the task of modernizing existing designs.

Author: Mohamed Haddar
Publisher: Springer Science & Business Media
ISBN: 3642371434
Category : Technology & Engineering
Languages : en
Pages : 653

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The 5th International Congress on Design and Modeling of Mechanical Systems (CMSM) was held in Djerba, Tunisia on March 25-27, 2013 and followed four previous successful editions, which brought together international experts in the fields of design and modeling of mechanical systems, thus contributing to the exchange of information and skills and leading to a considerable progress in research among the participating teams. The fifth edition of the congress (CMSM ́2013), organized by the Unit of Mechanics, Modeling and Manufacturing (U2MP) of the National School of Engineers of Sfax, Tunisia, the Mechanical Engineering Laboratory (MBL) of the National School of Engineers of Monastir, Tunisia and the Mechanics Laboratory of Sousse (LMS) of the National School of Engineers of Sousse, Tunisia, saw a significant increase of the international participation. This edition brought together nearly 300 attendees who exposed their work on the following topics: mechatronics and robotics, dynamics of mechanical systems, fluid structure interaction and vibroacoustics, modeling and analysis of materials and structures, design and manufacturing of mechanical systems. This book is the proceedings of CMSM ́2013 and contains a careful selection of high quality contributions, which were exposed during various sessions of the congress. The original articles presented here provide an overview of recent research advancements accomplished in the field mechanical engineering.

Author: Valentine Roux
Publisher: Springer
ISBN: 3030039730
Category : Social Science
Languages : en
Pages : 329

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Pottery is the most ubiquitous find in most historical archaeological excavations and serves as the basis for much research in the discipline. But it is not only its frequency that makes it a prime dataset for such research, it is also that pottery embeds many dimensions of the human experience, ranging from the purely technical to the eminently symbolic. The aim of this book is to provide a cutting-edge theoretical and methodological framework, as well as a practical guide, for archaeologists, students and researchers to study ceramic assemblages. As opposed to the conventional typological approach, which focuses on vessel shape and assumed function with the main goal of establishing a chronological sequence, the proposed framework is based on the technological approach. Such an approach utilizes the concept of chaîne opératoire, which is geared to an anthropological interpretation of archaeological objects. The author offers a sound theoretical background accompanied by an original research strategy whose presentation is at the heart of this book. This research strategy is presented in successive chapters that are geared to explain not only how to study archaeological assemblages, but also why the proposed methods are essential for achieving ambitious interpretive goals. In the heated debate on the equation stating that “pots equal people”, which is a rather fuzzy reference to assumed relationships between (mostly) ethnic groups and pottery, technology enables us to propose with conviction the equation “pots equal potters”. In this way, a well-founded history of potters is able to achieve a much better cultural and anthropological understanding of ancient societies.​

Author: Francisco Cavas-Martínez
Publisher: Springer
ISBN: 3030123464
Category : Technology & Engineering
Languages : en
Pages : 824

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This book contains the papers presented at the International Joint Conference on Mechanics, Design Engineering and Advanced Manufacturing (JCM 2018), held on 20-22 June 2018 in Cartagena, Spain. It reports on cutting-edge topics in product design and manufacturing, such as industrial methods for integrated product and process design; innovative design; and computer-aided design. Further topics covered include virtual simulation and reverse engineering; additive manufacturing; product manufacturing; engineering methods in medicine and education; representation techniques; and nautical, aeronautics and aerospace design and modeling. The book is divided into six main sections, reflecting the focus and primary themes of the conference. The contributions presented here will not only provide researchers, engineers and experts in a range of industrial engineering subfields with extensive information to support their daily work; they are also intended to stimulate new research directions, advanced applications of the methods discussed, and future interdisciplinary collaborations.

Author: Yasser Khazaal
Publisher: Frontiers Media SA
ISBN: 2889454967
Category : Video games in education
Languages : en
Pages : 311

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Book Description
Recent years have seen important developments in the computer and game industry, including the emergence of the concept of serious games. It is hypothesized that tools such as games, virtual reality, or applications for smartphones may foster learning, enhance motivation, promote behavioral change, support psychotherapy, favor empowerment, and improve some cognitive functions. Computers and games may create supports for training or help people with cognitive, emotional, or behavioral change. Games take various formats, from board games to informatics to games with interactive rules of play. Similarly, computer tools may vary widely in format, from self-help or assisted computerized training to virtual reality or applications for smartphones. Some tools that may be helpful for mental health were specifically designed for that goal, whereas others were not. Gamification of computer-related products and games with a numeric format tend to reduce the gap between games and computers tools and increase the conceptual synergy in such fields. Games and computer design share an opportunity for creativity and innovation to help create, specifically design, and assess preventive or therapeutic tools. Computers and games share a design conception that allows innovative approaches to overcome barriers of the real world by creating their own rules. Yet, despite the potential interest in such tools to improve treatment of mental disorders and to help prevent them, the field remains understudied and information is under-disseminated in clinical practice. Some studies have shown, however, that there is potential interest and acceptability of tools that support various vehicles, rationales, objectives, and formats. These tools include traditional games (e.g., chess games), popular electronic games, board games, computer-based interventions specifically designed for psychotherapy or cognitive training, virtual reality, apps for smartphones, and so forth. Computers and games may offer a true opportunity to develop, assess, and disseminate new prevention and treatment tools for mental health and well-being. Currently, there is a strong need for state-of-the-art information to answer questions such as the following: Why develop such tools for mental health and well-being? What are the potential additions to traditional treatments? What are the best strategies or formats to improve the possible impact of these tools? Are such tools useful as a first treatment step? What is the potential of a hybrid model of care that combines traditional approaches with games and/or computers as tools? What games and applications have already been designed and studied? What is the evidence from previous studies? How can such tools be successfully designed for mental health and well-being? What is rewarding or attractive for patients in using such treatments? What are the worldwide developments in the field? Are some protocols under development? What are the barriers and challenges related to such developments? How can these tools be assessed, and how can the way that they work, and for whom, be measured? Are the potential benefits of such products specific, or can these additions be attributed to nonspecific factors? What are the users’ views on such tools? What are the possible links between such tools and social networks? Is there a gap between evidence-based results and market development? Are there any quality challenges? What future developments and studies are needed in the field?

Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1132

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Author: Zay Jeffries
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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