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Author : John Jonsson
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)
Download or read book Studies on the Role of Microstructure in the Dynamic Strength of Metals written by John Jonsson and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laura Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book The Role of Temperature and Microstructure on the Dynamic Strength of Materials written by Laura Chen and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrey Belyakov
Publisher : MDPI
ISBN 13 : 3038975052
Total Pages : 272 pages
Book Rating : 4.0/5 (389 download)
Download or read book Microstructure and Mechanical Properties of Structural Metals and Alloys written by Andrey Belyakov and published by MDPI. This book was released on 2019-06-24 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers collected in this special issue clearly reflect the modern research trends in materials science. These fields of specific attention are high-Mn TWIP steels, high-Cr heat resistant steels, aluminum alloys, ultrafine grained materials including those developed by severe plastic deformation, and high-entropy alloys. The major portion of the collected papers is focused on the mechanisms of microstructure evolution and the mechanical properties of metallic materials subjected to various thermo-mechanical, deformation or heat treatments. Another large portion of the studies is aimed on the elaboration of alloying design of advanced steels and alloys. The changes in phase content, transformation and particle precipitation and their effect on the properties are also broadly presented in this collection, including the microstructure/property changes caused by irradiation.
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jie Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Unraveling the Role of Interfaces in the Deformation and Failure Behavior of Metallic Materials Under Dynamic Loading Conditions written by Jie Chen and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of next-generation high strength metallic materials for damage-resistant applications relies on a fundamental understanding of the deformation mechanisms and failure behavior of these materials under dynamic loading conditions. The dynamic strength of metals is typically characterized based on the "spall strength" defined as the peak tensile pressure the metal can withstand prior to failure. For pure FCC metals, the capability to increase the spall strength is limited due to insufficient microstructural features that can be used to tailor/modify the deformation and failure behavior under dynamic loading conditions. The current understanding of the role of grain boundaries and deformation twinning in BCC metals, however, is still in its infancy. Another promising strategy to design high strength microstructures is the engineering of nanoscale interfaces in alloy microstructures that may alter the nucleation and evolution of defects/damage. Such strategies have been successfully demonstrated experimentally in FCC/BCC alloy microstructures. A critical challenge in engineering these microstructures, however, is the lack of understanding on the role of interfaces on the spall failure behavior. Such an understanding is particularly challenging using experimental techniques due to the short time and length scales of the processes of nucleation and evolution of defects/damage. Therefore, the goal of this dissertation is to carry out a systematic study using classical molecular dynamics (MD) simulations to investigate the role of structure and energies of grain boundaries in BCC microstructures as well as the structure, size and distribution of FCC/BCC interfaces on the twinning/de-twinning behavior as well as the damage nucleation (void nucleation and growth) behavior under shock loading conditions. Such understanding will enable to identify key microstructural descriptors of the interfaces that determine the spall strength, and aid in the design of nanocrystalline Ta and Cu/Ta microstructures with enhanced spall strengths for damage-tolerant applications.
Author : So-Sum Leung
Publisher : Open Dissertation Press
ISBN 13 : 9781361024751
Total Pages : 192 pages
Book Rating : 4.0/5 (247 download)
Download or read book SIZE EFFECT ON MICRO-METAL STR written by So-Sum Leung and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Size Effect on Micro-metal Strength Simulated by Discrete Dislocation and Dislocation Density-function Dynamics" by So-sum, Leung, 梁素芯, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The pronounced smaller-being-stronger size effect of nano- and micron-metals has been extensively explored by experimental approaches and simulations in recent decades. In this study, 2D dislocation dynamics (2D DD) was used to simulate the tensile deformation of micron-sized polycrystalline fcc metals. When the grain size is constant, changing the specimen thickness increases the yield strength either when the thickness-to-grain size ratio (t-to-d ratio) is Apart from the size effect in poly-crystals, single crystals are also known to exhibit pronounced size effect. The size effect of single crystals can be expressed in a power-law σ D-m, in which the exponent m ranges from 0.3 to 1.0. Dislocation-density function dynamics was used in this study to explore the relationship between the size dependence of the yield strength and the dislocation microstructure in different specimen sizes. The "post-mortem" dislocation structure was analyzed to work out a length scale governing the size effect. It was found that the initial dislocation structure has a significant effect on the yield strength of single crystals. For the dislocation microstructure studied, specimens of sizes 4000 b and 8000 b are more significantly affected by the stochasticity of the initial dislocation micron structure, whereas the initial dislocation structure could be easily disentangled in even smaller specimens and thus the strength depend less on the initial microstructure. For larger specimen ( 16000 b), there is less stochasticity in the initial microstructure, since the specimen size is larger than the characteristic length describing the dislocation mean free path of the specimen. DDFD is also used to study the tensile deformation of tri-crystals. The grain size effect on the strength was studied. The simulated relationship between the 0.2% proof stress and the inverse square root obeys the Hall-Petch relation. In addition, the internal length scale was computed by applying a strain gradient plasticity theory (SG) to the 1D strain profile derived from DDFD results. To shed light on the identity of the internal length scale (l), l is compared with two characteristic lengths that describe the tri-crystal microstructure: the mean dislocation spacing 1/√p and the dislocation pile-up length. The internal length scale in general approximates to the pile-up length. Exception is found for the largest grain size L=500 nm when the strain is large in which l approximates to the mean dislocation spacing. This suggest that in general plasticity is governed by a length scale related to the dislocation-pileup length, whereas for the exceptional case the bowing out of dislocations through forest dislocations is the governing factor for plasticity. Subjects: Dislocations in metals
Author : J. Duby
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Dynamic Strength Properties of Metals written by J. Duby and published by . This book was released on 1956 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gustavo Mendes
Publisher :
ISBN 13 : 9781607415008
Total Pages : 0 pages
Book Rating : 4.4/5 (15 download)
Download or read book Strength of Materials written by Gustavo Mendes and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strength of a material refers to the material's ability to withstand an applied stress without failure. The applied stress may be tensile, compressive, or shear. A material's strength is dependent on its microstructure. The engineering processes to which a material is subjected can alter this microstrucure. This book provides a variety of material strength research including an extensive overview on the state of the art ceramic composite material BIOLOX delta which, since 2001, has successfully implanted more than 500,000 artificial hip joints. Due to the unique strength and toughness of this material, the risk of fracture has been substantially reduced when compared to conventional ceramic materials. Several different aspects of ionomer research from a physical property standpoint is discussed as well, including the history and current trends in ionomer research and a discussion on the immediate needs in this field. Furthermore, particle modelling (PM) as an innovative particulate dynamics based modelling approach is examined as a robust tool for simulating fracture problems of solids under extreme loading conditions, including situations of collapse, impact, blasting or high strain rate tension/compression. This book includes research on the ability of particle modelling to correctly predict dynamic fragmentation of materials with good accuracy.
Author : Francesco dell'Isola
Publisher : Springer Nature
ISBN 13 : 3030537552
Total Pages : 403 pages
Book Rating : 4.0/5 (35 download)
Download or read book Dynamics, Strength of Materials and Durability in Multiscale Mechanics written by Francesco dell'Isola and published by Springer Nature. This book was released on 2020-11-01 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the mathematical modeling and experimental study of systems involving two or more different length scales. The effects of phenomena occurring at the lower length scales on the behavior at higher scales are of intrinsic scientific interest, but can also be very effectively used to determine the behavior at higher length scales or at the macro-level. Efforts to exploit this micro- and macro-coupling are, naturally, being pursued with regard to every aspect of mechanical phenomena. This book focuses on the changes imposed on the dynamics, strength of materials and durability of mechanical systems by related multiscale phenomena. In particular, it addresses: 1: the impacts of effective dissipation due to kinetic energy trapped at lower scales 2: wave propagation in generalized continua 3: nonlinear phenomena in metamaterials 4: the formalization of more general models to describe the exotic behavior of meta-materials 5: the design and study of microstructures aimed at increasing the toughness and durability of novel materials
Author :
Publisher :
ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.3/5 (91 download)
Download or read book Research Awards Index written by and published by . This book was released on 1989 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : IM. Bernstein
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)
Download or read book Role of Alloying and Microstructure on the Strength and Toughness of Experimental Rail Steels written by IM. Bernstein and published by . This book was released on 1978 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous studies on eutectoid steel have demonstrated that strength and toughness are essentially independently varying parameters, with the former primarily controlled by the pearlite interlamellar spacing and the latter primarily controlled by the prior austenite grain size. The work has now been extended to study the effect of modest compositional variations on strength and toughness of 17 experimental rail alloys. Carbon, manganese, and silicon levels were varied over ranges to yield eutectoid or hypoeutectoid microstructures. Vanadium was added to some of these compositions, primarily as a grain refiner. These steels were heat treated to produce varying austenite grain sizes and a reasonably constant, fine pearlite spacing. Instrumented impact tests on precracked Charpy bars were performed to determine both the dynamic fracture toughness (KId), and the Charpy transition temperature. Tensile tests were used to monitor strength and ductility. Mechanical test data were correlated with observed microstructural variations, particularly the austenite grain size and pearlite spacing as well as fractographic studies of the variation of fracture facet size with austenite grain size. These studies led to a general description of the fracture process in such steels.
Author : R. Velmurugan
Publisher : Springer Nature
ISBN 13 : 9819962552
Total Pages : 418 pages
Book Rating : 4.8/5 (199 download)
Download or read book Dynamic Behavior of Soft and Hard Materials, Volume 2 written by R. Velmurugan and published by Springer Nature. This book was released on with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 486 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tarasankar DebRoy, Stan A. David, John N. DuPont, Toshihiko Koseki, Harry K. Bhadeshia
Publisher : ASM International
ISBN 13 : 1627089985
Total Pages : 1117 pages
Book Rating : 4.6/5 (27 download)
Download or read book Trends in Welding Research 2012: Proceedings of the 9th International Conference written by Tarasankar DebRoy, Stan A. David, John N. DuPont, Toshihiko Koseki, Harry K. Bhadeshia and published by ASM International. This book was released on 2013-03-01 with total page 1117 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Trends conference attracts the world's leading welding researchers. Topics covered in this volume include friction stir welding, sensing, control and automation, microstructure and properties, welding processes, procedures and consumables, weldability, modeling, phase transformations, residual stress and distortion, physical processes in welding, and properties and structural integrity of weldments.
Author : Sergey Galitskiy
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Modeling the Laser-Induced Phenomena and Spall Failure of Metal Microstructures at the Atomic Scales and the Mesoscales written by Sergey Galitskiy and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding of laser-induced phenomena in metals plays a critical role in pushing the current state-of-the-art in nanoscale laser processing methodologies (drilling, welding, surface structuring, etc.) and providing insights into the mechanisms of dynamic strength of materials. These techniques operate at small temporal and spatial scales (picoseconds and nanometers), often inaccessible with the experiment. The modeling approach can provide valuable insights into microstructural evolution at such scales. However, an accurate description of laser-matter interaction and lattice phenomena is challenging. This dissertation aims to develop and apply a novel modeling methodology to investigate the evolution of microstructure due to laser-induced phenomena at the atomic scales and the mesoscales. The developed mesoscale-continuum Quasi-coarse-grained Dynamics – two-temperature model (QCGD-TTM) combines an accurate description of laser energy absorption at nanoscales (within the TTM frame) and extends the domain of its applicability from nanometers to several microns by integration of QCGD. The developed model is used to determine the role of microstructure (orientation, grains, porosity, nanoscale geometry) in laser-induced melting and shock phenomena in metals. Chapter Two utilizes MD-TTM to investigate the behavior of nanoscale Al microstructures irradiated by ultrafast (femtoseconds) lasers. The formation of the shock wave, its propagation, and consequent material failure (spall) is studied for a range of orientation, grain structure, and laser parameters. It is demonstrated that elevated temperatures and defect density are the major factors determining the ability of a metal to withstand failure in extreme shock loading conditions. In Chapter Three, the mesoscale QCGD-TTM approach is developed and used to extend the investigation of spall phenomena in Al to micron scales. The coarser microstructure (grains) and larger system size reduce the spall strength and exhibit the conditions for partial fracture (incipient spall). The interaction of the incipient spall with secondary shockwaves facilitates damage healing by void volume reduction. Chapter Four investigates the role of porosity (voids) during shock. The interaction of mesoscale voids with shockwaves is studied in BCC single-crystal Ta using QCGD. The dynamics of void collapse and its influence on the microstructure and spall are characterized at various shock-loading conditions and porosity distribution. Chapter Five further develops MD/QCGD-TTM by implementing laser absorption models to accurately predict the microstructural evolution in complex nanoscale geometries. The model is used to study the laser melting in small (nanoscale to micron) Al particles at regimes close to the ablation threshold. The demonstrated dynamics of melting and consequent solidification of Al particles irradiated by pulsed laser suggest guidelines for surface nanostructuring techniques. This dissertation provides a versatile QCGD-TTM modeling framework to predict the microstructural evolution of metals at the nano and mesoscale. The model can be further utilized to study microstructural evolution in metals (shock phenomena, phase transformation, defect evolution, etc.) at the scales of a modern experiment, therefore, assisting the development of laser-based techniques.
Author : United States. Energy Research and Development Administration
Publisher :
ISBN 13 :
Total Pages : 1314 pages
Book Rating : 4.3/5 (91 download)
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Romesh C. Batra
Publisher : Springer Science & Business Media
ISBN 13 : 3642800017
Total Pages : 696 pages
Book Rating : 4.6/5 (428 download)
Download or read book Contemporary Research in Engineering Science written by Romesh C. Batra and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue failures occur in aerospace,marine,nuclear structures and automobile com ponents from initiation and propagation of cracks from holes,scratches or defects in the material. To design against these failures, crack propagation life and fracture strength need to be accurately predicted. It is reported in the literature, that these failures often initiate as surface cracks, corner cracks and cracks emanating from fastner holes. Such cracks are with elliptic or nearly elliptic in shapes. The deviation from elliptic shape is due to varying constraint effect along the crack front. Even in situations, when the cracks are through the thickness of the material, there would be thicknesswise variation of constraint effects leading to three dimensional nature of crack growth. Accurate predictions of the crack growth in these cases by numerical methods can be made only by solving three-dimensional boundary value problems. Empirical relationships have been developed [1] based on Linear Elastic Fracture Mechanics over years describing fatigue crack growth response. Some of these empirical relationships required modifications in the later stages, to meet the design applications. The Crack closure phenomenon discovered by Elber[2, 3] during the crack growth phase is mainly attributed to the local material yielding near the crack tip and the consequent residual plastic wake behind the crack tip. It helped considerably in understanding several aspects of fatigue crack growth and rewrite these relations.
