Download or read book Introduction To Adiabatic Shear Localization Revised Edition written by Bradley Dodd and published by World Scientific Publishing Company. This book was released on 2014-08-14 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Adiabatic Shear Localization written by Bradley Dodd and published by Elsevier. This book was released on 2012-05-22 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rev. ed. of: Adiabatic shear localization / Y. Bai and B. Dodd. 1992. 1st ed.
Download or read book Adiabatic Shear Localization written by Yilong Bai and published by Pergamon. This book was released on 1992-01-01 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Physics and Mathematics of Adiabatic Shear Bands written by T. W. Wright and published by Cambridge University Press. This book was released on 2002-07-22 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a research monograph on the material instability known as adiabatic shear banding which often occurs in a plastically deforming material as it undergoes rapid shearing. Plastic deformation generates heat, which eventually softens most materials with continued straining, a process which is usually unstable. In this case the instability results in thin regions of highly deformed material, which are often the sites of further damage and complete failure. The main body of the book examines a series of one-dimensional problems of increasing complexity. In this way a comprehensive and quantitative picture of the complete phenomena is built up. Particular care is taken to use well established asymptotic techniques to find simple, but universal, analytic expressions or scaling laws that encapsulate various aspects of the dynamic formation and the final morphology of shear bands. A fully developed mechanics of shear is just beginning to emerge as a major companion to fracture mechanics, this book may speed the process along.
Download or read book Analytical and Numerical Study of Shear Localization Phenomena written by James Armand DiLellio and published by . This book was released on 1997 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Initiation and Growth of Adiabatic Shear Bands written by T. W. Wright and published by . This book was released on 1985 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple version of thermo/viscoplasticity theory is used to model the formation of adiabatic shear bands in high rate deformation of solids. The one dimensional shearing deformation of a finite slab is considered. For the constitutive assumptions made in this paper, homogeneous shearing produces a stress/strain response curve that always has a maximum when strain and rate hardening, plastic heating, and thermal softening are taken into account. Shear bands form if a perturbation is added to the homogeneous fields just before peak stress is obtained with these new fields being used as initial conditions. The resulting initial/boundary value problem is solved by the finite element method for one set of material parameters. The shear band grows slowly at first, then accelerates sharply, until finally the plastic strain rate in the center reaches a maximum, followed by a slow decline. Stress drops rapidly throughout the slab, and the central temperature increases rapidly as the peak in strain rate develops.
Download or read book Ballistic Impact and Adiabatic Shear Localization written by Henry Andrew Grebe and published by . This book was released on 1983 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ADIABATIC SHEAR LOCALIZATION IN AISI 1340 AND 4340 STEELS written by HOMA. MOSTAGHIMI GHOMI and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Damage and Fragmentation written by David Edward Lambert and published by John Wiley & Sons. This book was released on 2019-01-14 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering structures may be subjected to extreme high-rate loading conditions, like those associated with natural disasters (earthquakes, tsunamis, rock falls, etc.) or those of anthropic origin (impacts, fluid–structure interactions, shock wave transmissions, etc.). Characterization and modeling of the mechanical behavior of materials under these environments is important in predicting the response of structures and improving designs. This book gathers contributions by eminent researchers in academia and government research laboratories on the latest advances in the understanding of the dynamic process of damage, cracking and fragmentation. It allows the reader to develop an understanding of the key features of the dynamic mechanical behavior of brittle (e.g. granular and cementitious), heterogeneous (e.g. energetic) and ductile (e.g. metallic) materials.
Download or read book Shear Localization in the Shear transformation zone Theory of Plasticity in Amorphous Systems written by Anthony J. Foglia and published by . This book was released on 2006 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: I examine two possible mechanisms for shear localization in the shear-transformation zone model as developed by Falk and Langer. The first method uses the elasticity of the surrounding material as medium for interaction between zones. Unfortunately, the model as currently written does not handle energy balance properly and for any physically reasonable set of parameters cannot cause shear bands without violating the second law of thermodynamics. The second method entails including an effective temperature to describe the configurational degrees of freedom. Such a model, does successfully produce shear bands as a steady state for certain ranges of strain rates. More importantly, this model is especially unstable during the initial transients of loading, and can produce shear bands for strain rates above a critical value that though temporary, last longer than typical experimental durations.
Download or read book Shear Localization in Rate and Temperature Dependent Solids written by Jeffrey LeMonds and published by . This book was released on 1986 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Formation of Adiabatic Shear Bands by Ballistic Tests written by José Fabio Vélez M and published by . This book was released on 1979 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Representing Shear Localization Under Dynamic Loading Conditions written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Approximate Analysis for the Formation of Adiabatic Shear Bands written by and published by . This book was released on 1990 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parametric solutions are given for the formation of adiabatic shear bands in the context of the one-dimensional, nonlinear theory where inertia and elasticity are ignored. When heat condition is also ignored, the exact solution reduces completely to a sequence of quadratures. For a perfectly plastic material with heat conduction, an implicit parametic solution is also constructed. This is similar to the previous one in many ways, but now it involves two quadratures; a single nonautonomous, first-order ODE; and two functions that obey heat equations. This solution appears to be very accurate (compared to the full-finite element solution) until the time of stress collapse. Results indicate that for weak rate hardening of the power-law type, intense localization depends strongly on the initial characteristics. Within the context of rigid/perfect plasticity, a scaling law for the critical strain is given, and a figure of merit is defined that ranks materials according to their tendency to form adiabatic shear bands. (JG).
Download or read book A Shear Banding Model for Penetration Calculations written by Martin N. Raftenberg and published by . This book was released on 2000-04 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model for introducing the effects of adiabatic shear banding into a penetration calculation was installed into the EPIC wavecode. These effects are deemed to be reduction in the ratio of flow stress to the value predicted by the Johnson-Cook strength model and increase in spall pressure. A strain-rate- and temperature-dependent instability strain is determined from small-amplitude perturbation of constant-strain-rate simple shear. Imposed alterations in flow stress ratio and spall pressure commence at the "localization strain", separated from the instability strain by a fixed strain increment. The alterations proceed linearly with increasing effective plastic strain and terminate after an additional fixed strain increment, at the "failure strain." The values imposed on the flow stress ratio and the spall pressure at the failure strain are functions of local pressure at the time step when localization strain was reached. The nonzero value imposed on the flow stress ratio in the case of positive localization pressure reflects the phenomenon of fracture suppression within a fully formed shear band. The two fixed strain increments are evaluated from a torsional Kolsky bar test. The pre-shear-banded spall pressure is evaluated from plate-on-plate impact data. The flow stress ratio and spall pressure at and beyond the failure strain introduce two currently "free" parameters. The model was applied to a set of problems involving steel plate perforation by a tungsten rod, and reasonable agreement with experiment was obtainable in terms of the final target hole size and the length and speed of the tungsten residual.
Download or read book Consideration of Microstructural Changes in the Study of Adiabatic Shear Bands written by and published by . This book was released on 1994 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have analyzed the effect of microstructural changes on the initiation and growth of shear bands. These have been studied by developing an adaptive mesh refinement technique to decipher adiabatic shear bands in two-dimensional problems, formulating a three-dimensional finite-deformation theory for dipolar thermoviscoplastic materials and using it to examine the initiation and growth of shear bands in plane strain thermomechanical deformations of dipolar materials, employing an internal variable theory of Brown, Kim and Anand to study the shear band problem, investigating the possibility of phase transformations during the development of adiabatic shear bands in a steel specimen, ascertaining the speed of propagation of a shear band in a steel tube, assessing the effect of frictional forces between the loading device and the cylinder ends, and, analyzing the development of a shear band in a FCC single crystal. Principal results obtained during these investigations are summarized in the report. (AN).
Download or read book On Stress Collapse in Adiabatic Shear Bands written by Thomas W. Wright and published by . This book was released on 1987 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamics of adiabatic shear band formation is considered making use of a simplified thermo/visco/plastic flow law. A new numerical solution is used to follow the growth of a perturbation from initiation, through early growth and severe localization, to a slowly varying terminal configuration. Asymptotic analyses predict the early and late stage patterns, but the timing and structure of the abrupt transition to severe localization can only be studied numerically, to date. A characteristic feature of the process is that temperature and plastic strain rate begin to localize immediately, but only slowly, whereas the stress first evolves almost as if there were no perturbation, but then collapses rapidly when severe localization occurs.
