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Adiabatic Shear Localization

Adiabatic Shear Localization
Frontiers and Advances

by Bradley Dodd,Yilong Bai

  • Publisher : Elsevier
  • Release : 2012
  • Pages : 454
  • ISBN : 0080977812
  • Language : En, Es, Fr & De
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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

Introduction to Adiabatic Shear Localization

Introduction to Adiabatic Shear Localization
Revised

by Bradley Dodd,Yilong Bai

  • Publisher : World Scientific Publishing Company
  • Release : 2014-08-14
  • Pages : 468
  • ISBN : 1783264357
  • Language : En, Es, Fr & De
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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.

Introduction To Adiabatic Shear Localization (Revised Edition)

Introduction To Adiabatic Shear Localization (Revised Edition)
A Book

by Bradley Dodd

  • Publisher : Unknown Publisher
  • Release : 2014
  • Pages : 469
  • ISBN : 9781783264346
  • Language : En, Es, Fr & De
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Spatial Evolution of Adiabatic Shear Localization in Stainless Steel, Titanium, and Ti-6A1-4V Alloy

Spatial Evolution of Adiabatic Shear Localization in Stainless Steel, Titanium, and Ti-6A1-4V Alloy
A Book

by Qing Xue

  • Publisher : Unknown Publisher
  • Release : 2001
  • Pages : 652
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Adiabatic Shear Localization : Frontiers and Advances

Adiabatic Shear Localization : Frontiers and Advances
A Book

by Bradley Dodd,Yilong Bai

  • Publisher : Unknown Publisher
  • Release : 2012
  • Pages : 469
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Adiabatic Shear Localization

Adiabatic Shear Localization
Occurrence, Theories, and Applications

by Yilong Bai,Bradley Dodd

  • Publisher : Pergamon
  • Release : 1992-01-01
  • Pages : 378
  • ISBN : 9780080412665
  • Language : En, Es, Fr & De
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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.

ADIABATIC SHEAR LOCALIZATION IN AISI 1340 AND 4340 STEELS

ADIABATIC SHEAR LOCALIZATION IN AISI 1340 AND 4340 STEELS
THE INFLUENCE OF MICROSTRUCTURE AND GEOMETRY.

by HOMA. MOSTAGHIMI GHOMI

  • Publisher : Unknown Publisher
  • Release : 2011
  • Pages : 129
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Ballistic Impact and Adiabatic Shear Localization

Ballistic Impact and Adiabatic Shear Localization
A Metallurgical Study

by Henry Andrew Grebe

  • Publisher : Unknown Publisher
  • Release : 1983
  • Pages : 242
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Adiabatic Shear Band Formation in Titanium

Adiabatic Shear Band Formation in Titanium
A Book

by M. Laxmi Prasad

  • Publisher : Unknown Publisher
  • Release : 1993
  • Pages : 248
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Dynamic Behavior of Two Advanced Materials

Dynamic Behavior of Two Advanced Materials
Ultrafine-grained Titanium and High-entropy Alloys

by Zezhou Li

  • Publisher : Unknown Publisher
  • Release : 2019
  • Pages : 190
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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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.

Adiabatic Shear in Remco Iron and Quenched and Tempered 4340 Steel

Adiabatic Shear in Remco Iron and Quenched and Tempered 4340 Steel
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1997
  • Pages : 6
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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This paper presents results from a study of adiabatic shear in a series of ferrous alloys: Remco iron (a high purity alpha iron), and 4340 steel, quenched & tempered at 650 degrees C. Punching-shear experiments were performed in a compressive split-Hopkinson bar producing shear strain rates of 45,000 per second. Optical & scanning electron microscopy was performed on the deformed shear specimens to determine the extent of shear localization and mode of failure. Experimental evidence showed whether the 4340 steels were susceptible to localization through adiabatic shear banding. Finite element simulations of the experiments were performed utilizing a user material subroutine developed as part of this research. This constitutive routine incorporates two adiabatic shear failure criteria: maximum shear stress and flow localization theory. The results show whether these criteria are capable of predicting the onset of an instability.

Analytical and Numerical Study of Shear Localization Phenomena

Analytical and Numerical Study of Shear Localization Phenomena
A Book

by James Armand DiLellio

  • Publisher : Unknown Publisher
  • Release : 1997
  • Pages : 71
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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About plastic and the elasticity of materials subjected to high rates of strain. Adiabatic shear band formation that has undergone localization is examined by analyzing the system of partial differential equations that govern stress, temperature, and plastic strain rate within the material.

The Physics and Mathematics of Adiabatic Shear Bands

The Physics and Mathematics of Adiabatic Shear Bands
A Book

by T. W. Wright,Thomas Wilson Wright

  • Publisher : Cambridge University Press
  • Release : 2002-07-22
  • Pages : 241
  • ISBN : 9780521631952
  • Language : En, Es, Fr & De
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Establishes the mathematical setting within which shear bands may be studied.

Springer Handbook of Experimental Solid Mechanics

Springer Handbook of Experimental Solid Mechanics
A Book

by William N. Sharpe

  • Publisher : Springer Science & Business Media
  • Release : 2008-12-04
  • Pages : 1098
  • ISBN : 0387268839
  • Language : En, Es, Fr & De
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As a reference book, the Springer Handbook provides a comprehensive exposition of the techniques and tools of experimental mechanics. An informative introduction to each topic is provided, which advises the reader on suitable techniques for practical applications. New topics include biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Written and compiled by internationally renowned experts in the field, this book is a timely, updated reference for both practitioners and researchers in science and engineering.

Localization and Fracture Phenomena in Inelastic Solids

Localization and Fracture Phenomena in Inelastic Solids
A Book

by Piotr Perzyna

  • Publisher : Springer
  • Release : 2014-05-04
  • Pages : 468
  • ISBN : 3709125286
  • Language : En, Es, Fr & De
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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.

Shear Band Formation in a W-Ni-Fe Alloy Under Plate Impact

Shear Band Formation in a W-Ni-Fe Alloy Under Plate Impact
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1992
  • Pages : 15
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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A thin foil of a W-Ni-Fe alloy, 50-200 micrometers in thickness, is sheared for 2 microseconds under plane wave conditions by plate impact. Shear bands observed show more intensely localized deformations than obtained in other experiments. The responses of the constituent phases, the tungsten grains and the matrix, as well as that of the composite alloy over a strain rate range of 10(exp -4)/s to 7 x 10(exp 5)/s are experimentally obtained and characterized by a viscoplastic model. The effects of strain hardening, thermal softening, material inertia, rate sensitivity, heat conduction and material microscopic inhomogeneity, on dynamic shear localization, are investigated through finite element simulations ... Shear bands, Adiabatic shear bands, WHA, Tungsten heavy alloys, Plate impact, Pressure-shear impact.

The Settlement Cook Book

The Settlement Cook Book
Treasured Recipes of Six Decades; the Famous All-purpose Cook Book for Beginner and Expert, the Way to a Man's Heart

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1965
  • Pages : 535
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The Mechanics of Shear Band Formation in Thermal Viscoplastic Materials at High Rates of Loading

The Mechanics of Shear Band Formation in Thermal Viscoplastic Materials at High Rates of Loading
A Book

by Raed A. Sherif

  • Publisher : Unknown Publisher
  • Release : 1989
  • Pages : 478
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The Development of a Tungsten Heavy Alloy That Fails by an Adiabatic Shear Mechanism. Phase 1

The Development of a Tungsten Heavy Alloy That Fails by an Adiabatic Shear Mechanism. Phase 1
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1993
  • Pages : 120
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Kinetic Energy penetrators made from Depleted Uranium (DU) alloys have consistently performed better than equi-density and geometrically similar penetrators made from conventional tungsten heavy alloys (WHA) during ballistic penetration tests into semi-infinite Rolled Homogeneous Armor (RHA) steel targets. The superior penetration behavior of DU penetrators is presently attributed to these penetrators maintaining a 'chisel' nose by failure along adiabatic shear bands which is in contrast to the 'mushroom' head observed in WHA penetrators; the 'mushroom' head decreases the energy density at the target thereby leading to reduced penetration. The radiological hazard of DU combined with chemical corrosion during storage provides an impetus to improving the state-of-the-art in WHA with respect to ballistic penetration behavior. Interestingly, WHA penetrators with DU matrix (instead of the conventional Ni- Fe, Ni-Co, or Ni-Fe-Co matrices) also fail by adiabatic shear indicating that shear localization is probably influenced greatly by matrix material properties. Hence, an investigation into alternative matrix materials for WHA that will support shear localization is warranted.

Cold Gas Dynamic Spray

Cold Gas Dynamic Spray
A Book

by Roman Gr. Maev,Volf Leshchynsky

  • Publisher : CRC Press
  • Release : 2016-04-27
  • Pages : 334
  • ISBN : 1466584432
  • Language : En, Es, Fr & De
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Your Guide to Advanced Cold Spray Technology Cold Gas Dynamic Spray centers on cold gas dynamic spray (or cold spray—CS) technology, one of the most versatile thermal spray coating methods in materials engineering, and effectively describes and analyzes the main trends and developments behind the spray (coating) techniques. The book combines theory with practice to enable the reader to deeper understand the CS coatings as well as their structures and properties, and describes the state of the art in CS technology with an emphasis on all major components of the cold spray process. This book begins with an introduction to CS spray and goes on to thoroughly explain the process. It describes the different powder synthesis methods and equipment currently used, and defines the CS coating microstructure, characterization methods, and properties of CS coatings. The authors present a comprehensive approach that highlights grit blasting and cold spraying as well as the hybrid CS-sintering technology that offers integrity of microstructure, compositional homogeneity, and mechanical property levels equal to (and frequently better than) those of the wrought counterpart. The book largely covers the basic principles of CS technology and also includes: A brief survey of thermal spray methods The basic principles of plasticity theory A description of the CS equipment, the nozzle design, and the geometry of a CS gun Coverage of the microstructural and mechanical properties of CS metals and alloys A detailed analysis of aircraft component repair using GS An overview of the economic aspects of CS applications. Cold Gas Dynamic Spray explains how cold gas dynamic spray works and what it can do, and is intended for engineering professionals working with sprays and coatings in the industry as well as graduate student specializing in material science, mechanical, automotive, aerospace, and chemical engineering.