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Author: Germain Court
Publisher:
ISBN: 9782110959423
Category :
Languages : fr
Pages : 167
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Book Description
Author: Germain Court
Publisher:
ISBN: 9782110959423
Category :
Languages : fr
Pages : 167
Get Book Here
Book Description
Author: HASSAN.. GOUAIR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 157
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Book Description
AU COURS DE CE TRAVAIL, NOUS AVONS PROCEDE A L'EXAMEN DES MECANISMES DE RUPTURE INITIES A PARTIR D'ENTAILLE SOUS SOLLICITATIONS DYNAMIQUES. DEUX TYPES DE RUPTURES ONT ETE EXAMINES: LA RUPTURE FRAGILE SUR UN VERRE ET UN ALLIAGE DE MOLYBDENE TZM, ET LA RUPTURE DUCTILE SUR UN ACIER XC18. NOTRE TRAVAIL A MONTRE L'INTERET D'UTILISER DES EPROUVETTES ENTAILLEES PREFERENTIELLEMENT AUX EPROUVETTES FISSUREES ET LE BIEN FONDE D'UNE APPROCHE EN TERME DE FACTEUR D'INTENSITE DE CONTRAINTES D'ENTAILLES. IL A ETE CONSTATE QUE LES MECANISMES DE RUPTURE SONT IDENTIQUES SOUS CHARGEMENT STATIQUE ET DYNAMIQUE. TOUTEFOIS, NOUS AVONS REMARQUE UNE AUGMENTATION DE LA DISPERSION DES RESULTATS QUE CE SOIT EN RUPTURE FRAGILE OU EN RUPTURE DUCTILE. CETTE AUGMENTATION DE LA DISPERSION TIRE SON EXPLICATION DE LA MULTIACTIVATION DES DEFAUTS. NOUS AVONS PARTICULIEREMENT MIS EN EVIDENCE CE POINT EN RUPTURE DUCTILE PAR OBSERVATION DU NOMBRE DE CUPULES PAR UNITE DE SURFACE. NOUS AVONS DEVELOPPE POUR TRAITER CE PROBLEME UNE APPROCHE MICROSTATISTIQUE. DEUX POSSIBILITES AUX DEPARTS: LE NOMBRE DE DEFAUTS ACTIVES EST INCONNU ET UN MODELE MICROSTATISTIQUE PERMET D'EN CONNAITRE LE NOMBRE PAR UNITE DE VOLUME A PARTIR DES RESULTATS PHENOMENOLOGIQUES, LE NOMBRE DE DEFAUTS ACTIVES EST OBTENU EXPERIMENTALEMENT ET LA MODELISATION MICROSTATISTIQUE PERMET DE PREVOIR LES RESULTATS PHENOMENOLOGIQUES, APPROCHE QUE NOUS AVONS SUIVI DANS LE CAS DE LA RUPTURE DUCTILE. CES DEUX APPROCHES BIEN QU'ENCORE RUDIMENTAIRES NOUS ONT DONNE DES RESULTATS PROMETTEURS
Author: Jacques Besson
Publisher: Springer Science & Business Media
ISBN: 9048133564
Category : Science
Languages : en
Pages : 433
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Book Description
In mechanical engineering and structural analysis there is a significant gap between the material models currently used by engineers for industry applications and those already available in research laboratories. This is especially apparent with the huge progress of computational possibilities and the corresponding dissemination of numerical tools in engineering practice, which essentially deliver linear solutions. Future improvements of design and life assessment methods necessarily involve non-linear solutions for inelastic responses, in plasticity or viscoplasticity, as well as damage and fracture analyses. The dissemination of knowledge can be improved by software developments, data base completion and generalization, but also by information and training. With such a perspective Non-Linear Mechanics of Materials proposes a knowledge actualization, in order to better understand and use recent material constitutive and damage modeling methods in the context of structural analysis or multiscale material microstructure computations.
Author: D. Caillard
Publisher: Elsevier
ISBN: 0080542786
Category : Technology & Engineering
Languages : en
Pages : 453
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Book Description
KEY FEATURES: - A unified, fundamental and quantitative resource. The result of 5 years of investigation from researchers around the world - New data from a range of new techniques, including synchrotron radiation X-ray topography provide safer and surer methods of identifying deformation mechanisms - Informing the future direction of research in intermediate and high temperature processes by providing original treatment of dislocation climb DESCRIPTION: Thermally Activated Mechanisms in Crystal Plasticity is a unified, quantitative and fundamental resource for material scientists investigating the strength of metallic materials of various structures at extreme temperatures. Crystal plasticity is usually controlled by a limited number of elementary dislocation mechanisms, even in complex structures. Those which determine dislocation mobility and how it changes under the influence of stress and temperature are of key importance for understanding and predicting the strength of materials. The authors describe in a consistent way a variety of thermally activated microscopic mechanisms of dislocation mobility in a range of crystals. The principles of the mechanisms and equations of dislocation motion are revisited and new ones are proposed. These describe mostly friction forces on dislocations such as the lattice resistance to glide or those due to sessile cores, as well as dislocation cross-slip and climb. They are critically assessed by comparison with the best available experimental results of microstructural characterization, in situ straining experiments under an electron or a synchrotron beam, as well as accurate transient mechanical tests such as stress relaxation experiments. Some recent attempts at atomistic modeling of dislocation cores under stress and temperature are also considered since they offer a complementary description of core transformations and associated energy barriers. In addition to offering guidance and assistance for further experimentation, the book indicates new ways to extend the body of data in particular areas such as lattice resistance to glide.
Author: F. G. Bell
Publisher: Elsevier
ISBN: 1483102270
Category : Technology & Engineering
Languages : en
Pages : 354
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Book Description
Engineering Properties of Soils and Rocks, Third Edition serves as a guide to the engineering properties and behavior of soils and rocks. The text also complements other texts on rock and soil mechanics. The book covers topics such as the properties and classification of soils such as tills and other kinds of soils related to cold climates, tropical soils, and organic soils such as peat. The text also includes the engineering behavior and properties, classification and description, discontinuities, and weathering of rocks and rock masses. The monograph is recommended for engineers who would like to know about the properties of soils and rocks and the application of their study in the field of engineering.
Author: H. R. Sasse
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 792
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Book Description
Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
Author: Leslie Rainer
Publisher: Getty Publications
ISBN: 1606060430
Category : Architecture
Languages : fr
Pages : 438
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Book Description
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Author: Bo Song
Publisher: Springer
ISBN: 3319224522
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
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.
Author: Jean-Paul Kurtz
Publisher: Springer Science & Business Media
ISBN: 0306483173
Category : Technology & Engineering
Languages : en
Pages : 1520
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Book Description
I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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