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Investigation Of The Ductile To Brittle Transition In Single Crystal Body Centered Cubic Metals With 3d Dislocation Dynamics
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Book Synopsis Investigation of the Ductile-to-brittle Transition in Single Crystal Body Centered Cubic Metals with 3D Dislocation Dynamics by : Jianming Huang
Download or read book Investigation of the Ductile-to-brittle Transition in Single Crystal Body Centered Cubic Metals with 3D Dislocation Dynamics written by Jianming Huang and published by . This book was released on 2004 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Brittle to Ductile Transition in BCC Metals by : Keyur Kashinath Karandikar
Download or read book Modeling of Brittle to Ductile Transition in BCC Metals written by Keyur Kashinath Karandikar and published by . This book was released on 2013 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brittle to ductile transition is an important mechanical property that is observed in metals, especially in those which have Body Centered Cubic structure. We present a framework that describes this transition by linking the dislocation dynamics with the resulting mechanical behavior and constitutive equations. Two different models based on dislocation theory are developed and applied are applied to Alpha-Iron and Tantalum monocrystals, One is a stress ratio model that is dependent on dislocation nucleation and the other is an Activation energy ratio model based on dislocation mobility. Both the models predict the Brittle to ductile transformation temperature and its dependence on various strain rates and temperatures. These models are compared and are accordingly found to be suitable for different strain rate and temperature conditions in terms of accuracy. The study highlights the possible significance as well as the applications of these ratios in dislocation and plasticity study of the respective materials. The conformity obtained between input and output in the models is predicted to be useful for experimentalists attempting to extract microscopic data from deformation tests on BCC single crystals.
Book Synopsis Study of Dislocation Dynamics Associated with Ductile--brittle Transition and Hydrogen Embrittlement Phenomena Observed in Bcc Metals. Annual Technical Progress Report II. by :
Download or read book Study of Dislocation Dynamics Associated with Ductile--brittle Transition and Hydrogen Embrittlement Phenomena Observed in Bcc Metals. Annual Technical Progress Report II. written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile-brittle Transition in the Refractory Metals by : F. R. Schwartzberg
Download or read book Ductile-brittle Transition in the Refractory Metals written by F. R. Schwartzberg and published by . This book was released on 1959 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Dislocation Dynamics Associated with Ductile-brittle Transition and Hydrogen Embrittlement Phenomena Observed in BCC Metals by :
Download or read book Study of Dislocation Dynamics Associated with Ductile-brittle Transition and Hydrogen Embrittlement Phenomena Observed in BCC Metals written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dislocation Dynamics and the Ductile-brittle Transition in Iron-binary Alloys by : Yew-Tsung Chen
Download or read book Dislocation Dynamics and the Ductile-brittle Transition in Iron-binary Alloys written by Yew-Tsung Chen and published by . This book was released on 1976 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile Mode Cutting of Brittle Materials by : Kui Liu
Download or read book Ductile Mode Cutting of Brittle Materials written by Kui Liu and published by Springer Nature. This book was released on 2019-10-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic and comprehensive interdisciplinary overview of ductile mode cutting of brittle materials, covering a range of topics from the fundamental physics to engineering practices. Discussing the machining mechanics and material properties, it explains the fundamental mechanism of ductile-to-brittle transition in the cutting of brittle materials. It also presents theoretical modeling and molecular dynamic simulation to demonstrate that ductile mode cutting can be achieved under certain conditions, as well as extensive experimental studies that produced smooth and damage-free surfaces on different materials, such as silicon, glass, tungsten carbide and calcium fluoride. Lastly, it explores how the ductile mode cutting performance and machinability of brittle materials can be further improved by hybrid machining processes like ultrasonic vibration and thermal-assisted cutting technologies in order to meet industry demands.
Book Synopsis Molecular Dynamics Study of Void Growth and Dislocations in Dynamic Fracture of FCC and BCC Metals by :
Download or read book Molecular Dynamics Study of Void Growth and Dislocations in Dynamic Fracture of FCC and BCC Metals written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Void growth with concomitant dislocation formation has been studied in single crystal face-centered-cubic and body-centered-cubic metals using molecular dynamics method with Embedded-Atom and Finnis-Sinclair potentials for copper and tantalum, respectively. We have concentrated on the quantitative analysis of the void shape evolution, on the structure of dislocations, which emerge from the void, and on the continuum measures such as plastic strain. The effects of strain-rate, differences between lattice structures, and loading conditions as uniaxial, biaxial, and triaxial expansion on the shape of the void and on the dislocations have been investigated.
Book Synopsis Dislocation Dynamics of Face-centered Cubic Metals and Alloys by : Ryan B. Sills
Download or read book Dislocation Dynamics of Face-centered Cubic Metals and Alloys written by Ryan B. Sills and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Face-centered cubic (FCC) metals and alloys--such as aluminum, copper, and austenitic stainless steel--are ubiquitous in the automotive, aerospace, and oil and gas industries. To further our understanding of the nature of plastic deformation in these materials, we have utilized dislocation dynamics (DD) simulations. We begin with a study of time integration in dislocation dynamics, examining the time-step-limiting aspects of DD, and developing a new subcycling-based time integrator that improves efficiency 100-fold. We then utilize this time integrator to study the basics of plasticity in pure, single crystalline copper. DD simulations were run over a wide range of strain rates and initial dislocation densities, examining how the yield strength and hardening rate vary, and making comparisons against the available experimental data. A detailed study on the contribution of binary dislocation junctions to hardening is then presented, showing that these junctions are an essential ingredient for hardening to occur. We then go on to study the most common strengthening mechanisms employed in FCC metals: solid solution strengthening and precipitation strengthening. After deriving the suitable chemical potential for the solute atoms comprising a solid solution, the influence of an "atmosphere" of solutes surrounding a dislocation on the stress field and line tension of the dislocation are examined, showing that these effects are generally small. The drag force exerted on dislocations by their atmospheres is then studied. We find these drag forces are often larger than those due to lattice friction, and can influence plasticity in FCC materials significantly. To study precipitation strengthening, a new algorithm for simulating dislocation-precipitate interactions is developed, which allows for ellipsoidal inclusions with arbitrary aspect ratio and arbitrary misfit. The new formulation is used to study Orowan looping in overaged aluminum-copper alloys, which have plate-like precipitates. The results and methods presented here constitute a broad set of advancements towards a more sound understanding of plastic deformation in FCC metals and alloys.
Download or read book 3D Dislocation Dynamics written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A dislocation dynamics (DD) model for plastic deformation, connecting the macroscopic mechanical properties to basic physical laws governing dislocation mobility and related interaction mechanisms, has been under development. In this model there is a set of critical reactions that determine the overall results of the simulations, such as the stress-strain curve. These reactions are, annihilation, formation of jogs, junctions, and dipoles, and cross-slip. In this paper we discuss these reactions and the manner in which they influence the simulated stress- strain behavior in fcc and bcc metals. In particular, we examine the formation (zipping) and strength of dipoles and junctions, and effect of jogs, using the dislocation dynamics model. We show that the strengths (unzipping) of these reactions for various configurations can be determined by direct evaluation of the elastic interactions. Next, we investigate the phenomenon of hardening in metals subjected to cascade damage dislocations. The microstructure investigated consists of small dislocation loops decorating the mobile dislocations. Preliminary results reveal that these loops act as hardening agents, trapping the dislocations and resulting in increased hardening.
Book Synopsis 3D Discrete Dislocation Dynamics Study on Fundamental Creep Mechanisms in Single Crystal Superalloys by : Siwen Gao
Download or read book 3D Discrete Dislocation Dynamics Study on Fundamental Creep Mechanisms in Single Crystal Superalloys written by Siwen Gao and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of the Brittle Behavior of Metallic and Nonmetallic Materials by : George T. Hahn
Download or read book A Comparison of the Brittle Behavior of Metallic and Nonmetallic Materials written by George T. Hahn and published by . This book was released on 1961 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Ductile-Brittle Transition for Certain BCC and HCP Metals by : R. W. Armstrong
Download or read book Investigation of the Ductile-Brittle Transition for Certain BCC and HCP Metals written by R. W. Armstrong and published by . This book was released on 1975 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general purpose of this research program has been two-fold: (1) to determine the brittle fracture characteristics, mainly, of several steel and titanium materials; and, (2) to develop via appropriate constitutive relations a detailed description of the ductile-brittle transition behaviour which is exhibited by certain BCC and HCP metals. The brittle fracture behaviour of these materials was directly measured by tensile testing at 4.2K. Compression tests at 4.2K were performed, also, so as to establish the nature of whatever plastic deformation behaviour might be induced in the absence of applied tensile stresses.
Book Synopsis Fracture and Ductile Vs. Brittle Behavior - Theory, Modelling and Experiment: Volume 539 by : Glenn E. Beltz
Download or read book Fracture and Ductile Vs. Brittle Behavior - Theory, Modelling and Experiment: Volume 539 written by Glenn E. Beltz and published by . This book was released on 1999-04-16 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Boundary Conditions for Dislocation Dynamics Simulations and Stage 0 of BCC Metals at Low Temperature by :
Download or read book Boundary Conditions for Dislocation Dynamics Simulations and Stage 0 of BCC Metals at Low Temperature written by and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to study the dislocation density evolution of body centered cubic (bcc) crystals at low temperature by dislocation dynamics (DD) simulations, we investigated carefully three different boundary conditions (BC) for DD, i.e., the quasi-free surface BC, the flux-balanced BC, and the periodic BC. The latter two BCs can account for the dislocation loss from the boundary of the finite simulation box. PBC can also eliminate the influence of surfaces and improve the line connectivity. We have found that the PBC provides a convenient and effective boundary condition for DD simulations and have applied it to the study of dislocation density evolution of bcc metals during stage 0 deformation at low temperature.
