Fracture and Ductile Vs. Brittle Behavior - Theory, Modelling and Experiment. Symposium Held November 30-December 3, 1998, Boston, Massachusetts. Volume 539 PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This volume contains papers presented at the 1998 MRS Fall Meeting in Boston, Massachusetts, in Symposium M, entitled "Fracture and Ductile vs. Brittle Behavior-Theory, Modelling and Experiment." The symposium brought together the many communities that investigate the fundamentals of fracture, with special emphasis on the ductile/brittle transition across a broad spectrum of material classes, fracture at interfaces, and modelling fracture over various length scales. Theoretical techniques discussed ranged from first-principles electronic structure theory to atomistic simulation to mesoscale and continuum theories, along with studies of fractals and scaling in fracture. Experimental and theoretical talks were interspersed throughout all sessions, rather than being segregated. The contributions to this volume generally follow the topical outline upon which the symposium was organized. The first part, dealing with ductile vs. brittle behavior in metals, concerns itself with investigations of high-strength steel, magnesium alloys, ordered intermetallics, and Fe-Cr-Al alloys. The development of analytical methods based on micromechanical models, such as dislocation mechanics and cohesive/contact zone models, are covered in a follow-up section. Nonmetals, including silicon, are considered in Parts III and IV. Fractals, chaos, and scaling theories are taken up in Part V, with a special emphasis on fracture in heterogeneous solids. Modelling based on large populations of dislocations has substantially progressed during the past three years, hence, a section devoted to crystal plasticity and mesoscale dislocation modelling appears next. Finally, the technologically significant area of interfacial fracture, with applications to composites and intergranular fracture, is taken up in Part VII.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This volume contains papers presented at the 1998 MRS Fall Meeting in Boston, Massachusetts, in Symposium M, entitled "Fracture and Ductile vs. Brittle Behavior-Theory, Modelling and Experiment." The symposium brought together the many communities that investigate the fundamentals of fracture, with special emphasis on the ductile/brittle transition across a broad spectrum of material classes, fracture at interfaces, and modelling fracture over various length scales. Theoretical techniques discussed ranged from first-principles electronic structure theory to atomistic simulation to mesoscale and continuum theories, along with studies of fractals and scaling in fracture. Experimental and theoretical talks were interspersed throughout all sessions, rather than being segregated. The contributions to this volume generally follow the topical outline upon which the symposium was organized. The first part, dealing with ductile vs. brittle behavior in metals, concerns itself with investigations of high-strength steel, magnesium alloys, ordered intermetallics, and Fe-Cr-Al alloys. The development of analytical methods based on micromechanical models, such as dislocation mechanics and cohesive/contact zone models, are covered in a follow-up section. Nonmetals, including silicon, are considered in Parts III and IV. Fractals, chaos, and scaling theories are taken up in Part V, with a special emphasis on fracture in heterogeneous solids. Modelling based on large populations of dislocations has substantially progressed during the past three years, hence, a section devoted to crystal plasticity and mesoscale dislocation modelling appears next. Finally, the technologically significant area of interfacial fracture, with applications to composites and intergranular fracture, is taken up in Part VII.
Author: Glenn E. Beltz Publisher: ISBN: Category : Reference Languages : en Pages : 360
Book Description
Dramatic progress has been made in the fundamentals of fracture, with special emphasis on the ductile/brittle transition across a broad spectrum of material classes. Unfortunately, however, since these studies are carried out in diverse research communities, communication among the different groups is limited. This book brings these diverse groups together. Contributions generally follow the topical outline upon which the symposium was organized. Part I deals with brittle/ductile behavior of steels and structural metallic alloys. The development of analytical models based on micromechanical models, such as dislocation mechanics and cohesive/contact zone models, is the focus of Part II. Nonmetals, including silicon, are reviewed in Parts III and IV. Fractals, chaos, and scaling theories, with emphasis on fracture in heterogeneous solids, is the basis of Part V. Crystal plasticity and mesoscale dislocation modelling follow in Part VI, with the technologically significant area of interfacial fracture featured in Part VII.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This volume contains papers presented at the 1998 MRS Fall Meeting in Boston, Massachusetts, In Symposium M, entitled "Fracture and Ductile vs. Brittle Behavior-Theory, Modeling and Experiment." The symposium brought together the many communities that investigate the fundamentals of fracture, with special emphasis on the ductile/brittle transition across a broad spectrum of material classes, fracture at interfaces, and modeling fracture over various length scales. Theoretical techniques discussed ranged from first principles electronic structure theory to atomistic simulation to mesoscale and continuum theories, along with studies of fractals and scaling in fracture. Experimental and theoretical talks were interspersed throughout all sessions, rather than being segregated. The symposium was generously supported by the Office of Naval Research, the Army Research office, the Air force office of Scientific Research, and the Center for Theoretical Computational Materials Science at the National Institute of Standards and Technology. The organizers would like to offer our personal thanks to Dr. Brian Sanders and Dr. Ozden Ochoa of AFOSR, Dr. Peter Reynolds of ONR; and Dr. Sharon Glotzer and Dr. Jim Warren of CTCMS/NIST for their role in encouraging excellence fracture research.
Author: Terry M. Tritt Publisher: ISBN: Category : Electric power production Languages : en Pages : 552
Book Description
This volume, the 3rd in a series from the Materials Research Society, examines the current state of the art in thermoelectric materials research. The focus is on both the scientific capabilities currently employed, and those which are needed to provide new classes of thermoelectric materials with significant enhancement in the figure of merit, Z (100% or greater). This is a challenge for the thermoelectrics community, and thus drives the discussion towards new and innovative directions. Potential applications for thermoelectric technologies are discussed, with emphasis on typing specific materials properties/issues to the desired applications. Overviews of current application needs from thermoelectric devices, and thus the requirements for new materials or device design, are also featured. The volume is multidisciplinary in nature, with representation from the fields of physics, chemistry and materials science. Theoretical studies are presented, as well as experimental efforts in solid-state synthesis, new bulk materials, think-film and superlattice development, nanostructure materials, and new developments in property measurement, especially thermal conductivity.
Author: Publisher: ISBN: Category : Languages : en Pages : 402
Book Description
This volume contains the papers that were presented at the 1995 MRS Fall Meeting in Symposium Q, entitled 'Fracture: Instability Dynamics, Scaling, and Ductile/Brittle Behavior.' The purpose of the symposium was to bring together the many communities that investigate the fundamentals of fracture, with special sessions on the ductile/brittle transition, fracture at interfaces, fracture in ceramics and composites, dynamic instabilities in crack propagation, and fractals and scaling in fracture. A full-day joint session was held with Symposium P, 'Materials Theory, Simulations, and Parallel Algorithms.' What was most striking about the symposium was the rich variety of methods that investigators use to model fracture. At the most detailed level, ab initio techniques are used, for instance, to estimate the strength of adhesion at an interface as a function of local structure and composition. At the next level, classical molecular dynamics provide a close up view of a propagating crack in a two- or three-dimensional solid, at least over short length and time scales. Green's function methods provide a way to model the behavior of materials at the atomic scale in the static limit, with zero temperature and strain rate. At the mesoscale, defects such as dislocations may be modelled as point particles (in 2-D) or as line segments (in 3-D) with long-range interactions. The dislocation density may be approximated as a continuous function of position and time, or even treated as an order parameter in a statistical mechanical model. At larger length scales, finite element and continuum models are used to study mixed mode crack propagation, and bond network models are used to represent the behavior of fiber composites. p9.
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Author: Glenn E. Beltz
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Author: Terry M. Tritt
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Author: Lauralice de Campos Franceschini Canale