Adiabatic Shear Localization

Introduction To Adiabatic Shear Localization Book PDF
✏Book Title : Introduction to Adiabatic Shear Localization
✏Author : Bradley Dodd
✏Publisher : World Scientific Publishing Company
✏Release Date : 2014-08-14
✏Pages : 468
✏ISBN : 9781783264353
✏Available Language : English, Spanish, And French

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✏Introduction to Adiabatic Shear Localization Book Summary : Adiabatic shear bands are found in a variety of metals and other materials; they cause rapid weakening due to energy concentration into narrow regions of the material. This is the very first book on this important topic and the only true introduction to the subject. An enhanced and updated student-friendly edition of the authors' 1992 book Adiabatic Shear Localization: Occurrence, Theories and Applications, this seminal text now includes essential Further Reading sections in some chapters. It explains adiabatic shear bands in a descriptive rather than a mathematical way, with a ‘quick reference’ section for readers wanting a more rapid introduction. Entirely comprehensive, the reader can dip into the chapters as suits his or her course material or research. If you are a postgraduate materials scientist, engineer, physicist, metallurgist, or indeed any researcher in materials that undergo rapid deformation and failure, this text is not to be missed.

Adiabatic Shear Localization Book PDF
✏Book Title : Adiabatic Shear Localization
✏Author : Bradley Dodd
✏Publisher : Elsevier
✏Release Date : 2012
✏Pages : 454
✏ISBN : 9780080977812
✏Available Language : English, Spanish, And French

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✏Adiabatic Shear Localization Book Summary : Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the revised and updated version of the first detailed study of the mechanics and modes of adiabatic shear localization in solids. Building on the success of the first edition, the book provides a systematic description of a number of aspects of adiabatic shear banding. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. Specific chapters focus on energetic materials, polymers, bulk metal glasses, and the mathematics of shear banding as well as the numerical modeling of them. With its detailed coverage of the subject, this book is of great interest to academics and researchers into materials performance as well as professionals. Up-to-date coverage of the subject and research that has occurred over the past 20 years Each chapter is written on a different sub-field of adiabatic shear by an acknowledged expert in the field Detailed and clear discussions of each aspect

Adiabatic Shear Localization Book PDF
✏Book Title : Adiabatic Shear Localization
✏Author : Yilong Bai
✏Publisher : Pergamon
✏Release Date : 1992-01-01
✏Pages : 378
✏ISBN : 0080412661
✏Available Language : English, Spanish, And French

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✏Adiabatic Shear Localization Book Summary : Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.

Spatial Evolution Of Adiabatic Shear Localization In Stainless Steel Titanium And Ti 6a1 4v Alloy Book PDF
✏Book Title : Spatial Evolution of Adiabatic Shear Localization in Stainless Steel Titanium and Ti 6A1 4V Alloy
✏Author : Qing Xue
✏Publisher :
✏Release Date : 2001
✏Pages : 652
✏ISBN : UCSD:31822029649936
✏Available Language : English, Spanish, And French

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✏Spatial Evolution of Adiabatic Shear Localization in Stainless Steel Titanium and Ti 6A1 4V Alloy Book Summary :

Adiabatic Shear Band Formation In Titanium Book PDF
✏Book Title : Adiabatic Shear Band Formation in Titanium
✏Author : M. Laxmi Prasad
✏Publisher :
✏Release Date : 1993
✏Pages : 248
✏ISBN : UCSD:31822017742115
✏Available Language : English, Spanish, And French

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✏Adiabatic Shear Band Formation in Titanium Book Summary :

The Physics And Mathematics Of Adiabatic Shear Bands Book PDF
✏Book Title : The Physics and Mathematics of Adiabatic Shear Bands
✏Author : T. W. Wright
✏Publisher : Cambridge University Press
✏Release Date : 2002-07-22
✏Pages : 241
✏ISBN : 0521631955
✏Available Language : English, Spanish, And French

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✏The Physics and Mathematics of Adiabatic Shear Bands Book Summary : Establishes the mathematical setting within which shear bands may be studied.

Dynamic Behavior Of Two Advanced Materials Book PDF
✏Book Title : Dynamic Behavior of Two Advanced Materials
✏Author : Zezhou Li
✏Publisher :
✏Release Date : 2019
✏Pages : 190
✏ISBN : OCLC:1134765928
✏Available Language : English, Spanish, And French

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✏Dynamic Behavior of Two Advanced Materials Book Summary : Dynamic deformation occurs when bodies are subjected to rapidly changing loads and can differ significantly from deformation that occurs under static or quasi-static situations. It is of great significance to understand the deformation and failure mechanisms of advanced materials, and there are potential applications in which dynamic deformation and failure can occur. Two classes of advanced materials, ultrafine-grained (UFG) (~500 nm and ~100 nm) titanium and high-entropy alloys (HEAs) (Al0.3CoCrFeNi and CoCrFeMnNi) are the focus of this doctoral investigation. The deformation and adiabatic shear localization at cryogenic temperatures (173 K and 77 K) in ultrafine-grained (100 and 500 nm) titanium are investigated. In comparison with conventionally-grained titanium, the strength of ultrafine-grained titanium is higher due to the classic Hall-Petch effect while the strain-hardening rate approaches zero. Our results show that shear localization in dynamic deformation is also altered. The width of the shear band of coarse-grained titanium decreases from 30 [mu]m at 293 K to 18 [mu]m at 77 K (a 40% decrease). In contrast, for 100 nm titanium, the width of shear band decreases more significantly from 4 [mu]m at room temperature to 1 [mu]m (a 75% decrease) at cryogenic temperature (77 K). This difference is attributed to the combined effects of a decrease in the thermal conductivity and the specific heat capacity, and an increase in the thermal softening, which can lead to a band with thickness of 1 [mu]m. These changes agree with the predictions of the Grady and Bai-Dodd theories. The dislocation evolution and the subgrain rotation mechanisms responsible for forming ultrafine- and nano- recrystallized grains are modeled. In addition, the Zener-Hollomon parameter is incorporated in the analysis to predict the critical dislocation density for shear localization and the recrystallized grain size in titanium . The mechanical behavior of three single-phase face-centered-cubic (fcc) Al0.3CoCrFeNi, annealed CoCrFeMnNi and as-processed CoCrFeMnNi high-entropy alloys (HEAs) was studied in both quasi-static and high strain-rate regimes. Based on Hall-Petch strengthening, solid-solution strengthening, order hardening, cutting forest dislocations, and twinning hardening mechanisms, a constitutive equation was proposed to describe the flow of the annealed CoCrFeMnNi high-entropy alloy under dynamic impact. The resistance to shear localization is being established by dynamically-loading hat-shaped specimens that induce forced shear localization. Adiabatic shear band formation required an imposed shear strain of ~7 for the annealed CoCrFeMnNi HEA and cannot be observed at a strain of 1.1 for the Al0.3CoCrFeNi HEA. The structural and mechanical response that give rise to a remarkable resistance to shear localization are characterized by a combination of (1) a high strain-hardening ability, enabled by solid solution hardening, forest dislocation hardening, order hardening, and twinning hardening, (2) a high strain-rate sensitivity and (3) modest thermal softening; these combination effects give rise to the remarkable resistance to shear localization. First, the low stacking-fault energies in as-received high-entropy alloys lead to the formation of twinned segments inside the coarse grains. Then, when the thermal softening overcomes strain hardening, the shear bands would form, and dynamic recrystallization occurs inside the segments for the further break-up of the grains. Classical Straker equation is applied to predict the critical shear strain for shear localization, which was quite comparable to the experimental values in the high-entropy alloys. It was revealed that the as-processed CoCrFeMnNi HEA was prone to shear localization due to the initially high dislocation density which results in a relatively low work-hardening effect. The dynamic deformation of these two metallic materials leads to adiabatic shear band formation at extreme shear strains. The resultant of the ultrafine grain structure observed in these two materials with diverse structures (HCP for Ti and FCC for HEAs) is remarkably similar and reinforces the concept of rotational dynamic recrystallization as the mechanism responsible for localization.

Proceedings Of The Second International Conference On Structural Stability And Dynamics Book PDF
✏Book Title : Proceedings of the Second International Conference on Structural Stability and Dynamics
✏Author : G. R. Liu
✏Publisher : World Scientific
✏Release Date : 2003
✏Pages : 1059
✏ISBN : 9789812382542
✏Available Language : English, Spanish, And French

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✏Proceedings of the Second International Conference on Structural Stability and Dynamics Book Summary : ICSSD 2002 is the second in the series of International Conferences on Structural Stability and Dynamics, which provides a forum for the exchange of ideas and experiences in structural stability and dynamics among academics, engineers, scientists and applied mathematicians. Held in the modern and vibrant city of Singapore, ICSSD 2002 provides a peep at the areas which experts on structural stability and dynamics will be occupied with in the near future. From the technical sessions, it is evident that well-known structural stability and dynamic theories and the computational tools have evolved to an even more advanced stage. Many delegates from diverse lands have contributed to the ICSSD 2002 proceedings, along with the participation of colleagues from the First Asian Workshop on Meshfree Methods and the International Workshop on Recent Advances in Experiments and Computations on Modeling of Heterogeneous Systems. Forming a valuable source for future reference, the proceedings contain 153 papers ? including 3 keynote papers and 23 invited papers ? contributed by authors from all over the world who are working in advanced multi-disciplinary areas of research in engineering. All these papers are peer-reviewed, with excellent quality, and cover the topics of structural stability, structural dynamics, computational methods, wave propagation, nonlinear analysis, failure analysis, inverse problems, non-destructive evaluation, smart materials and structures, vibration control and seismic responses.The major features of the book are summarized as follows: a total of 153 papers are included with many of them presenting fresh ideas and new areas of research; all papers have been peer-reviewed and are grouped into sections for easy reference; wide coverage of research areas is provided and yet there is good linkage with the central topic of structural stability and dynamics; the methods discussed include those that are theoretical, analytical, computational, artificial, evolutional and experimental; the applications range from civil to mechanical to geo-mechanical engineering, and even to bioengineering.

Localization And Fracture Phenomena In Inelastic Solids Book PDF
✏Book Title : Localization and Fracture Phenomena in Inelastic Solids
✏Author : Piotr Perzyna
✏Publisher : Springer
✏Release Date : 2014-05-04
✏Pages : 468
✏ISBN : 9783709125281
✏Available Language : English, Spanish, And French

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✏Localization and Fracture Phenomena in Inelastic Solids Book Summary : The book contains the discussion of some important aspects of localization and fracture phenomena in inelastic solids (single crystals, polycrystalline solids and geological materials). Physical and experimental foundations of crystal plasticity are given. Constitutive modelling of dissipative solids for description of localization and fracture is presented. Various regularization methods for solution of the initial-boundary value problems are outlined. Numerical solutions based on finite element method of practicular evolution problems with localization of plastic deformation are considered.

Dynamic Behavior Of Materials Book PDF
✏Book Title : Dynamic Behavior of Materials
✏Author : Marc A. Meyers
✏Publisher : John Wiley & Sons
✏Release Date : 1994-10-11
✏Pages : 688
✏ISBN : 047158262X
✏Available Language : English, Spanish, And French

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✏Dynamic Behavior of Materials Book Summary : Addresses fundamentals and advanced topics relevant to the behavior of materials under in-service conditions such as impact, shock, stress and high-strain rate deformations. Deals extensively with materials from a microstructure perspective which is the future direction of research today.

Dynamic Behavior Of Materials Volume 1 Book PDF
✏Book Title : Dynamic Behavior of Materials Volume 1
✏Author : Bo Song
✏Publisher : Springer Science & Business Media
✏Release Date : 2013-10-01
✏Pages : 496
✏ISBN : 9783319007717
✏Available Language : English, Spanish, And French

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✏Dynamic Behavior of Materials Volume 1 Book Summary : Dynamic Behavior of Materials, Volume 1: Proceedings of the 2013 Annual Conference on Experimental and Applied Mechanics, the first volume of eight from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Experimental Mechanics, including papers on: General Dynamic Material Properties Novel Dynamic Testing Techniques Dynamic Fracture and Failure Novel Testing Techniques Dynamic Behavior of Geo-materials Dynamic Behavior of Biological and Biomimetic Materials Dynamic Behavior of Composites and Multifunctional Materials Dynamic Behavior of Low-Impedance materials Multi-scale Modeling of Dynamic Behavior of Materials Quantitative Visualization of Dynamic Behavior of Materials Shock/Blast Loading of Materials

Computational Methods For Predicting Material Processing Defects Book PDF
✏Book Title : Computational Methods for Predicting Material Processing Defects
✏Author : M. Predeleanu
✏Publisher : Elsevier
✏Release Date : 2014-06-28
✏Pages : 372
✏ISBN : 9781483298498
✏Available Language : English, Spanish, And French

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✏Computational Methods for Predicting Material Processing Defects Book Summary : The papers in this book deal with computational methods for predicting material processing defects. Using recent advances in finite strain plasticity and viscoplasticity, damage modelling, bifurcation and instability theory, fracture mechanics and computer numerical techniques, new approaches to mechanical defect analysis are proposed. Appropriate methods for explaining and avoiding the defects leading to fracture, high porosity, strain localization or undesirable geometrical imperfections are presented. In addition, some papers are devoted to new formulations and new calculation algorithms to be used for solving the forming problems. Finally, two papers deal with physical description of defects occurring in forming and cutting operations, focusing on the academic and practical interest of these topics. This is the first book to deal with the prediction of defects occurring in material forming processes; it contains much of interest from both a theoretical and a practical viewpoint.

Opportunities In Protection Materials Science And Technology For Future Army Applications Book PDF
✏Book Title : Opportunities in Protection Materials Science and Technology for Future Army Applications
✏Author : National Research Council
✏Publisher : National Academies Press
✏Release Date : 2011-08-27
✏Pages : 176
✏ISBN : 9780309212854
✏Available Language : English, Spanish, And French

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✏Opportunities in Protection Materials Science and Technology for Future Army Applications Book Summary : Armor plays a significant role in the protection of warriors. During the course of history, the introduction of new materials and improvements in the materials already used to construct armor has led to better protection and a reduction in the weight of the armor. But even with such advances in materials, the weight of the armor required to manage threats of ever-increasing destructive capability presents a huge challenge. Opportunities in Protection Materials Science and Technology for Future Army Applications explores the current theoretical and experimental understanding of the key issues surrounding protection materials, identifies the major challenges and technical gaps for developing the future generation of lightweight protection materials, and recommends a path forward for their development. It examines multiscale shockwave energy transfer mechanisms and experimental approaches for their characterization over short timescales, as well as multiscale modeling techniques to predict mechanisms for dissipating energy. The report also considers exemplary threats and design philosophy for the three key applications of armor systems: (1) personnel protection, including body armor and helmets, (2) vehicle armor, and (3) transparent armor. Opportunities in Protection Materials Science and Technology for Future Army Applications recommends that the Department of Defense (DoD) establish a defense initiative for protection materials by design (PMD), with associated funding lines for basic and applied research. The PMD initiative should include a combination of computational, experimental, and materials testing, characterization, and processing research conducted by government, industry, and academia.

15th Wear Of Materials Book PDF
✏Book Title : 15th Wear of Materials
✏Author : P Blau
✏Publisher : Elsevier
✏Release Date : 2005-10-17
✏Pages : 1600
✏ISBN : 0080447368
✏Available Language : English, Spanish, And French

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✏15th Wear of Materials Book Summary : These proceedings of the 15th International Conference on Wear of Materials focus on the friction and wear of materials in various applications under different environments from the nanometer scale to the meter scale. The conference provides a unique international forum for researchers and practitioners from different disciplines to exchange latest results. Coverage includes: . Wear assessment and monitoring . Wear modeling, mechanisms, mapping and prediction . Wear-corrosion testing and control . Surface engineering for wear and wear-corrosion control . Development of new wear test methods and wear test methodologies . Wear of materials for biomedical applications . Wear of non-equilibrium materials: from atomic dimensions to the micro-scale . Wear of hard and superhard materials . Wear of materials in the earthmoving, minerals processing and mining industries

Introduction To Low Pressure Gas Dynamic Spray Book PDF
✏Book Title : Introduction to Low Pressure Gas Dynamic Spray
✏Author : Roman Gr. Maev
✏Publisher : John Wiley & Sons
✏Release Date : 2009-08-14
✏Pages : 244
✏ISBN : 9783527621910
✏Available Language : English, Spanish, And French

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✏Introduction to Low Pressure Gas Dynamic Spray Book Summary : Written by the inventor of the Gas Dynamic Spray (GDS) technique, this first monograph on the topic brings the understanding of the GDS coating formation process to a new qualitative nanostructural level, while introducing it to industrial and technological experts so that they can develop a new generation of coatings materials. Representing the results of over ten years of research in the field, the material discussed here covers nearly every aspect of the physical principles and applications of the GDS process, including topics in applied solid state physics, materials science, nanotechnology, and materials characterization. With contributions from researchers working in various laboratories, academic institutions and industries, this book is written for those wishing to apply this novel spraying technology in industry and who are involved in the development of new specific material properties, whether engineers or experts in the automotive, aircraft, household machinery, nuclear power, materials development or other industries.

📒Nanomaterials ✍ K.T. Ramesh

Nanomaterials Book PDF
✏Book Title : Nanomaterials
✏Author : K.T. Ramesh
✏Publisher : Springer Science & Business Media
✏Release Date : 2009-06-12
✏Pages : 316
✏ISBN : 9780387097831
✏Available Language : English, Spanish, And French

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✏Nanomaterials Book Summary : This book grew out of my desire to understand the mechanics of nanomaterials, and to be able to rationalize in my own mind the variety of topics on which the people around me were doing research at the time. The ?eld of nanomaterials has been growing rapidly since the early 1990s. I- tially, the ?eld was populated mostly by researchers working in the ?elds of synt- sis and processing. These scientists were able to make new materials much faster than the rest of us could develop ways of looking at them (or understanding them). However, a con?uence of interests and capabilities in the 1990s led to the exp- sive growth of papers in the characterization and modeling parts of the ?eld. That con?uence came from three primary directions: the rapid growth in our ability to make nanomaterials, a relatively newfound ability to characterize the nanomate- als at the appropriate length and time scales, and the rapid growth in our ability to model nanomaterials at atomistic and molecular scales. Simultaneously, the commercial potential of nanotechnology has become app- ent to most high-technology industries, as well as to some industries that are tra- tionally not viewed as high-technology (such as textiles). Much of the rapid growth came through the inventions of physicists and chemists who were able to develop nanotechnology products (nanomaterials) through a dizzying array of routes, and who began to interface directly with biological entities at the nanometer scale. That growth continues unabated.

Mechanical Behaviour Of Engineering Materials Book PDF
✏Book Title : Mechanical Behaviour of Engineering Materials
✏Author : Y.M. Haddad
✏Publisher : Springer Science & Business Media
✏Release Date : 2001-11-30
✏Pages : 508
✏ISBN : 1402003501
✏Available Language : English, Spanish, And French

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✏Mechanical Behaviour of Engineering Materials Book Summary : This monograph consists of two volumes and provides a unified, comprehensive presentation of the important topics pertaining to the understanding and determination of the mechanical behaviour of engineering materials under different regimes of loading. The large subject area is separated into eighteen chapters and four appendices, all self-contained, which give a complete picture and allow a thorough understanding of the current status and future direction of individual topics. Volume I contains eight chapters and three appendices, and concerns itself with the basic concepts pertaining to the entire monograph, together with the response behaviour of engineering materials under static and quasi-static loading. Thus, Volume I is dedicated to the introduction, the basic concepts and principles of the mechanical response of engineering materials, together with the relevant analysis of elastic, elastic-plastic, and viscoelastic behaviour. Volume II consists of ten chapters and one appendix, and concerns itself with the mechanical behaviour of various classes of materials under dynamic loading, together with the effects of local and microstructural phenomena on the response behaviour of the material. Volume II also contains selected topics concerning intelligent material systems, and pattern recognition and classification methodology for the characterization of material response states. The monograph contains a large number of illustrations, numerical examples and solved problems. The majority of chapters also contain a large number of review problems to challenge the reader. The monograph can be used as a textbook in science and engineering, for third and fourth undergraduate levels, as well as for the graduate levels. It is also a definitive reference work for scientists and engineers involved in the production, processing and applications of engineering materials, as well as for other professionals who are involved in the engineering design process.

Dynamic Failure Of Materials And Structures Book PDF
✏Book Title : Dynamic Failure of Materials and Structures
✏Author : Arun Shukla
✏Publisher : Springer Science & Business Media
✏Release Date : 2009-10-20
✏Pages : 194
✏ISBN : 1441904468
✏Available Language : English, Spanish, And French

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✏Dynamic Failure of Materials and Structures Book Summary : Dynamic Failure of Materials and Structures discusses the topic of dynamic loadings and their effect on material and structural failure. Since dynamic loading problems are very difficult as compared to their static counterpart, very little information is currently available about dynamic behavior of materials and structures. Topics covered include the response of both metallic as well as polymeric composite materials to blast loading and shock loadings, impact loadings and failure of novel materials under more controlled dynamic loads. These include response of soft materials that are important in practical use but have very limited information available on their dynamic response. Dynamic fragmentation, which has re-emerged in recent years has also been included. Both experimental as well as numerical aspects of material and structural response to dynamic loads are discussed. Written by several key experts in the field, Dynamic Failure of Materials and Structures will appeal to graduate students and researchers studying dynamic loadings within mechanical and civil engineering, as well as in physics and materials science.

Shock Wave And High Strain Rate Phenomena In Materials Book PDF
✏Book Title : Shock Wave and High Strain Rate Phenomena in Materials
✏Author : Meyers
✏Publisher : CRC Press
✏Release Date : 1992-05-12
✏Pages : 1184
✏ISBN : 0824785797
✏Available Language : English, Spanish, And French

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✏Shock Wave and High Strain Rate Phenomena in Materials Book Summary : These proceedings of EXPLOMET 90, the International Conference on the Materials Effects of Shock-Wave and High-Strain-Rate Phenomena, held August 1990, in La Jolla, California, represent a global and up-to-date appraisal of this field. Contributions (more than 100) deal with high-strain-rate deforma

Advances In Engineering Plasticity Book PDF
✏Book Title : Advances in Engineering Plasticity
✏Author : T.X. Yu
✏Publisher : Trans Tech Publications Ltd
✏Release Date : 2000-04-09
✏Pages : 856
✏ISBN : 9783035703832
✏Available Language : English, Spanish, And French

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✏Advances in Engineering Plasticity Book Summary : Volume is indexed by Thomson Reuters CPCI-S (WoS). From the early industrial revolution, metal working has been the major driving force for the development of many manufacturing technologies. “Advances in Engineering Plasticity” reports on recent developments in the field of metal forming and plasticity research from both the fundamental science and industrial application perspective.

Microstructural Characterization Of Shear Band Formation In Al Li Alloys Book PDF
✏Book Title : Microstructural Characterization of Shear Band Formation in Al Li Alloys
✏Author : Roa Wen Chen
✏Publisher :
✏Release Date : 1993
✏Pages : 414
✏ISBN : UCSD:31822017739004
✏Available Language : English, Spanish, And French

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✏Microstructural Characterization of Shear Band Formation in Al Li Alloys Book Summary :

Rate Effects On Localized Shear Deformation During Nanosectioning Of An Amorphous Thermoplastic Polymer Book PDF
✏Book Title : Rate Effects on Localized Shear Deformation During Nanosectioning of an Amorphous Thermoplastic Polymer
✏Author :
✏Publisher :
✏Release Date : 2017
✏Pages :
✏ISBN : OCLC:1016939024
✏Available Language : English, Spanish, And French

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✏Rate Effects on Localized Shear Deformation During Nanosectioning of an Amorphous Thermoplastic Polymer Book Summary : Highlights: Nanosectioning of polymers is performed using an instrumented ultramicrotome. Shear localization structures form on the sectioned surface of the polymer at or above a critical sectioning speed. An adiabatic shearing model and a suitable constitutive law are used to model the thermomechanical behavior of the polymer during sectioning. An onset speed for shear localizations is predicted, agreeing with the experimental results. Abstract: To investigate the effects of loading rate on the thermomechanical behavior of thermoplastic polymer during sectioning, polymethyl methacrylate (PMMA) sections with a thickness below 100 nm were made at different sectioning speeds by an instrumented ultramicrotome and the sectioning forces were measured. Atomic force microscopy was used to characterize the topographical features of the sectioned surfaces. Periodic structures of shear localizations were observed to form when the sectioning speed exceeded a critical value. With the measured sectioning parameters and other parameters determined based on previous studies, the effects of sectioning speed on the thermomechanical response of this polymer were analyzed using an existing adiabatic shearing model and a suitable constitutive law. A sectioning speed for the onset of shear localization was predicted, agreeing with the experimental results. The method presented in this work provides an approach to analyze the formation of shear localizations in polymers at the nanometer scale deformation.

Shear Flow Localization In Thermoviscoplastic Materials And A Numerical Study Of Dynamic Problems In Continuous Media Book PDF
✏Book Title : Shear flow Localization in Thermoviscoplastic Materials and a Numerical Study of Dynamic Problems in Continuous Media
✏Author : Harischandra P. Cherukuri
✏Publisher :
✏Release Date : 1995
✏Pages : 560
✏ISBN : OCLC:34657261
✏Available Language : English, Spanish, And French

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✏Shear flow Localization in Thermoviscoplastic Materials and a Numerical Study of Dynamic Problems in Continuous Media Book Summary : In the present work, three problems are considered. The first problem is concerned with the study of shear-flow localization in thermoviscoplastic materials in the setting of a one-dimensional simple shearing of an infinite plate subjected to constant-velocity boundary conditions. Both the isothermal and adiabatic boundary conditions are considered and localization is assumed to be triggered by either geometric or temperature imperfections in the body. A localization criterion based on the evolution of the total kinetic energy is proposed and used in comparing the susceptibilities of various engineering materials to localization. Further, the completion of localization is identified with the attainment of a maximum in the plastic strain rate at the center of the band. Several numerical experiments are conducted to study the influence of dissipation, diffusion and inertia on localization. The validity of such assumptions as negligible inertia and adiabatic deformation is examined. Also, the validity of the classical Fourier's law is explored through a modification to the Fourier's equation. In addition, the possibility of localization due to the inhomogeneity of the material structure is studied by considering the simple shearing of a multilayered plate made of two different materials. In the second part of the present work, an accurate finite difference scheme is presented for the propagation of elastic waves in a thick disk subjected to traction boundary conditions. One face of the disk is subjected to an impact load while the rest of the surface is traction-free. A stability condition based on the classical von Neumann analysis is also derived. The numerical results compare excellently with analytical results from a modal analysis. Finally, in the third part of the present work, the dispersion characteristics of a non-dissipative scheme for wave propagation problems in continuous media is studied.

Damage Mechanics In Engineering Materials Book PDF
✏Book Title : Damage Mechanics in Engineering Materials
✏Author : Jiann-Wen Woody Ju
✏Publisher : Elsevier
✏Release Date : 1998-03-04
✏Pages : 545
✏ISBN : 0080530230
✏Available Language : English, Spanish, And French

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✏Damage Mechanics in Engineering Materials Book Summary : This book contains thirty peer-reviewed papers that are based on the presentations made at the symposium on "Damage Mechanics in Engineering Materials" on the occasion of the Joint ASME/ASCE/SES Mechanics Conference (McNU97), held in Evanston, Illinois, June 28-July 2, 1997. The key area of discussion was on the constitutive modeling of damage mechanics in engineering materials encompassing the following topics: macromechanics/micromechanical constitutive modeling, experimental procedures, numerical modeling, inelastic behavior, interfaces, damage, fracture, failure, computational methods. The book is divided into six parts: Study of damage mechanics. Localization and damage. Damage in brittle materials. Damage in metals and metal matrix composites. Computational aspects of damage models. Damage in polymers and elastomers.

Congr S International Sur Le Comportement M Canique Et Physique Des Mat Riaux Sous Sollicitations Dynamique Book PDF
✏Book Title : Congr s International Sur Le Comportement M canique Et Physique Des Mat riaux Sous Sollicitations Dynamique
✏Author :
✏Publisher :
✏Release Date : 1997
✏Pages :
✏ISBN : UCAL:B4403528
✏Available Language : English, Spanish, And French

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✏Congr s International Sur Le Comportement M canique Et Physique Des Mat riaux Sous Sollicitations Dynamique Book Summary :

Strain Localization During Discontinuous Plastic Flow At Extremely Low Temperatures Book PDF
✏Book Title : Strain Localization During Discontinuous Plastic Flow at Extremely Low Temperatures
✏Author :
✏Publisher :
✏Release Date : 2016
✏Pages :
✏ISBN : OCLC:1052051377
✏Available Language : English, Spanish, And French

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✏Strain Localization During Discontinuous Plastic Flow at Extremely Low Temperatures Book Summary : Highlights: The paper deals with an extended, physically based, multiaxial constitutive model of discontinuous plastic flow, including new feature of strain localization at near 0 K temperatures in polycrystalline materials. Another new feature defines the drop of stress being entirely determined by dislocations density before and after the serration. Regular way of nucleation and free unconstrained glide of slip bands is observed within the sample, in the absence of phase transformation. Contrary to former views, strong coupling of discontinuous plastic flow with fcc-bcc phase transformation in metastable materials is observed. Abstract: The phenomenon of strain localization in the course of discontinuous plastic flow (DPF) at extremely low temperatures is investigated. DPF is observed mainly in fcc metals and alloys strained in cryogenic conditions, practically down to absolute zero. These materials undergo at low temperatures a process similar to dynamic strain ageing, manifested by the so called serrated yielding (DPF). DPF is attributed to the mechanism of local catastrophic failure of lattice barriers (including Lomer–Cottrell locks), under the stress fields related to the accumulating edge dislocations. Failure of LC locks leads to massive motion of released dislocations, accompanied by step-wise increase of the strain rate (macroscopic slip) and drastic drop of stress. Recent experiments indicate strong strain localization in the form of shear bands propagating along the sample. The plastic power dissipated in the shear band is partially converted to heat, which results in a local drastic increase of temperature promoted by the so-called thermodynamic instability (nearly adiabatic process). The Dirac-like temperature function is measured by two thermometers located in the gage length of the sample. Spatio-temporal correlation indicates smooth shear band propagation, as long as the process of phase transformation remains on hold. A physically based multiaxial constitutive model presented in the paper describes both DPF and strain localization, accompanied by temperature distribution represented by Green-like solution of heat diffusion equation. The model accounts for the thermodynamic background, including phonon mechanism of heat transport, accompanied by specific heat vanishing with the temperature approaching absolute zero. Experimental identification of parameters of the constitutive model is carried out. A projection of the model to the range where the phase transformation takes place is discussed.

The Physics Of Deformation And Fracture Of Polymers Book PDF
✏Book Title : The Physics of Deformation and Fracture of Polymers
✏Author : A. S. Argon
✏Publisher : Cambridge University Press
✏Release Date : 2013-03-07
✏Pages : 511
✏ISBN : 9780521821841
✏Available Language : English, Spanish, And French

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✏The Physics of Deformation and Fracture of Polymers Book Summary : A physical, mechanism-based presentation of the plasticity and fracture of polymers, covering industrial scale applications through to nanoscale biofluidic devices.

📒Magnesium ✍ Karl U. Kainer

Magnesium Book PDF
✏Book Title : Magnesium
✏Author : Karl U. Kainer
✏Publisher : John Wiley & Sons
✏Release Date : 2006-03-06
✏Pages : 1088
✏ISBN : 9783527606290
✏Available Language : English, Spanish, And French

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✏Magnesium Book Summary : The need for light-weight materials, especially in the automobile industry, created renewed interest in innovative applications of magnesium materials. This demand has resulted in increased research and development activity in companies and research institutes in order to achieve an improved property profile and better choice of alloy systems. Here, development trends and application potential in different fields like the automotive industry and communication technology are discussed in an interdisciplinary framework.

📒Nanowires And Nanobelts ✍ Zhong Lin Wang

Nanowires And Nanobelts Book PDF
✏Book Title : Nanowires and Nanobelts
✏Author : Zhong Lin Wang
✏Publisher : Springer Science & Business Media
✏Release Date : 2005-09-29
✏Pages : 475
✏ISBN : 0387287051
✏Available Language : English, Spanish, And French

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✏Nanowires and Nanobelts Book Summary : Volume 1, Metal and Semiconductor Nanowires covers a wide range of materials systems, from noble metals (such as Au, Ag, Cu), single element semiconductors (such as Si and Ge), compound semiconductors (such as InP, CdS and GaAs as well as heterostructures), nitrides (such as GaN and Si3N4) to carbides (such as SiC). The objective of this volume is to cover the synthesis, properties and device applications of nanowires based on metal and semiconductor materials. The volume starts with a review on novel electronic and optical nanodevices, nanosensors and logic circuits that have been built using individual nanowires as building blocks. Then, the theoretical background for electrical properties and mechanical properties of nanowires is given. The molecular nanowires, their quantized conductance, and metallic nanowires synthesized by chemical technique will be introduced next. Finally, the volume covers the synthesis and properties of semiconductor and nitrides nanowires.

📒Aluminium Alloys 2006 Icaa10 ✍ Warren J. Poole

Aluminium Alloys 2006 Icaa10 Book PDF
✏Book Title : Aluminium Alloys 2006 ICAA10
✏Author : Warren J. Poole
✏Publisher : Trans Tech Publications Ltd
✏Release Date : 2006-07-15
✏Pages : 2100
✏ISBN : 9783038130475
✏Available Language : English, Spanish, And French

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✏Aluminium Alloys 2006 ICAA10 Book Summary : The world production of primary and recycled aluminum continues to increase and, over the past twenty years, has risen from ~15 Mt/y in 1985 to ~32 Mt/y in 2005. The main consumers are transportation, beverage and other packaging, and building construction. The global primary aluminum production has been growing by about 2-3% per year. However, growth rates over the last decade have been much higher. In particular, during the past five years, China has played a critical role in aluminum production and has gone through a dramatic period of growth.