Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Deformation And Failure Models Of High Strength Steels For Finite Element Simulations
Download Deformation And Failure Models Of High Strength Steels For Finite Element Simulations full books in PDF, epub, and Kindle. Read online Deformation And Failure Models Of High Strength Steels For Finite Element Simulations ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Deformation and Failure Models of High Strength Steels for Finite Element Simulations by : Marvin Nahrmann
Download or read book Deformation and Failure Models of High Strength Steels for Finite Element Simulations written by Marvin Nahrmann and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crystal Plasticity Finite Element Methods by : Franz Roters
Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
Book Synopsis Modeling Steel Deformation in the Semi-Solid State by : Marcin Hojny
Download or read book Modeling Steel Deformation in the Semi-Solid State written by Marcin Hojny and published by Springer. This book was released on 2017-09-07 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a unique approach to integrated high-temperature process modelling, intended to serve as a design aid for new metal processing technologies. The second edition has been substantially expanded to include new content such as: a new algorithm and test results of 3D stereoscopic visualization; new programming procedures for modelling; the validation of computer simulation using experimental results; a multiscale model of grain growth; a conceptual methodology developing “high-temperature” CCT (continuous cooling transformation) diagrams, and many more examples validating the numerical simulations. The models presented are applied in comprehensive tests in order to solve problems related to the high-temperature deformation of steel. The testing methods include both physical tests using specialist laboratory instruments, and advanced mathematical modelling: the Finite Element method (FE), Smoothed Particle Hydrodynamics method (SPH) and Mo nte Carlo method (MC).This approach, which integrates the fields of physical and computer-based simulations, forms the basis for the described concept of integrated high-temperature process modelling, presented in detail in this book.
Book Synopsis New Advanced High Strength Steels by : Mohamed Goune
Download or read book New Advanced High Strength Steels written by Mohamed Goune and published by John Wiley & Sons. This book was released on 2024-01-11 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, significant developments have been made to increase the mechanical strength of steels in order to reduce the overall weight of structures, particularly in motor vehicles. Depending on the application, the increase in strength should not be at the expense of forming and in-use properties. The development of ultra-high strength steels requires a search for new trade-offs between these properties in order to optimize the final microstructure. New Advanced High Strength Steels analyzes the interactions between tensile mechanical properties and properties such as work hardening, anisotropy, resistance to rupture, fatigue life, corrosion resistance, crashworthiness, edge retention, hydrogen resistance and weldability. It also examines the links between the microstructural parameters of high-strength steels and the properties mentioned above. It highlights the metallurgical developments that have been necessary for the emergence of these new generations of steels. The book concludes with a look ahead to future developments in ultra-high strength steels
Book Synopsis A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel by : Wasim Akram Tarar
Download or read book A New Finite Element Procedure for Fatigue Life Prediction and High Strain Rate Assessment of Cold Worked Advanced High Strength Steel written by Wasim Akram Tarar and published by . This book was released on 2008 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation presents a new finite element procedure for fatigue life prediction and high strain rate assessment of cold worked Advanced High Strength Steel (AHSS). The first part of this research is related to the development of a new finite element procedure from an energy-based fatigue life prediction framework previously developed for prediction of axial, bending and multi-axial fatigue life. The framework for the prediction of fatigue life via energy analysis consists of constitutive laws which correlate the cyclic energy to the amount of energy required to fracture a material. In this study, the energy expressions that construct the new constitutive laws are integrated into a minimum potential energy formulation to develop new finite elements for fatigue life prediction for structural components subjected to axial, bending and multi-axial cyclic loads. The comparison of finite element method (FEM) results to the existing experimental fatigue data verifies the new finite element method for fatigue life prediction. The final output of this finite element analysis is in the form of number of cycles to failure for each element. The performance of the fatigue finite element is demonstrated by the fatigue life predictions from Al 6061-T6 and Ti-6Al-4V. In addition to developing new fatigue finite elements, a new equivalent stress expression and a new finite element procedure for multiaxail fatigue life prediction are also proposed. The new procedure is applicable to biaxial as well as multiaxial fatigue applications. The second part of this research is related to the development of LSDYNA material model for vehicle crash simulation based on high strain rate assessment of cold worked AHSS. In order to simulate actual crash using software like LSDYNA, it is desirable to have accurate stress/strain data for materials. The material models available in the literature ignore the effect of cold working on the material and present data only for flat sheets. In this research, the cold worked AHSS with curved cross-section is tested at strain rates of 1000 (in/in)/s and the data is used to develop a corresponding LSDYNA material model for vehicle crash simulation.
Book Synopsis Predicting the Flow and Failure Properties of Dual Phase Steel Using Finite Element and Phenomenological Models by : Arshdeepsingh Sardar
Download or read book Predicting the Flow and Failure Properties of Dual Phase Steel Using Finite Element and Phenomenological Models written by Arshdeepsingh Sardar and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Owing to the complexity of the mechanical response of Dual Phase (DP) steels, steel makers rely largely on experiments and trial-and-error approaches to develop new lines with higher strength and ductility in order to enable light weighting of automotive parts. Crucially, the flow and failure behaviors are intimately linked to the morphology of the microstructure. This thesis focuses on developing two approaches that use morphological features to predict the flow and failure behavior of DP Steels. In the local field approach, realistic microstructures are obtained through electron microscopy and used to construct a composite phase finite element model which is then subjected to uni-axial deformation. The second approach exploits phenomenological models to connect the deformation and failure at the microscopic level to the average mechanical response. Using basic microstructural features and flow behavior of the ferrite and martensite phases, the flow and failure behavior of DP Steels is estimated.
Book Synopsis Mechanical Behavior of Materials by : William F. Hosford
Download or read book Mechanical Behavior of Materials written by William F. Hosford and published by Cambridge University Press. This book was released on 2010 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a textbook on the mechanical behavior of materials for mechanical and materials engineering. It emphasizes quantitative problem solving. This new edition includes treatment of the effects of texture on properties and microstructure in Chapter 7, a new chapter (12) on discontinuous and inhomogeneous deformation, and treatment of foams in Chapter 21.
Book Synopsis Failure Simulations at Multiple Length Scales in High Temperature Structural Alloys by : Chao Pu
Download or read book Failure Simulations at Multiple Length Scales in High Temperature Structural Alloys written by Chao Pu and published by . This book was released on 2015 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of computational methodologies have been developed to investigate the deformation and damage mechanism of various structural materials at different length scale and under extreme loading conditions, and also to provide insights in the development of high-performance materials. In microscopic material behavior and failure modes, polycrystalline metals of interest include heterogeneous deformation field due to crystalline anisotropy, inter/intra grain or phase and grain boundary interactions. Crystal plasticity model is utilized to simulate microstructure based polycrystalline materials, and micro-deformation information, such as lattice strain evolution, can be captured based on crystal plasticity finite element modeling (CPFEM) in ABAQUS. The comparison of advanced experimental measurement and numerical simulation facilitates the understanding of the deformation and stress partitioning mechanisms in dual phase steel (DP980) and multilayered steel. For corrosion or oxidation induced failure in high temperature alloys, a cohesive zone model (CZM) is introduced to describe the interfacial traction and separation behavior. By coupling diffusion process with CZM, impurity degradation effect at grain boundary can be studied to predict intergranular failure mechanism under corrosive environments. On the other hand, microscopic numerical methods are not efficient or applicable in the damage predictions for structural components. To this end, elastic perfect plastic (EPP) model has been proposed as an efficient tool to evaluate creep and fatigue damage for structural material (nickel based superalloy A617, SS316 etc.) at elevated temperatures. This methodology will be applied in numerous finite element simulations. By comparing with simplified method test data, the feasibility of EPP methodology at elevated temperatures can be verified.
Book Synopsis BALLISTICS 2014 by : Richard G. Ames
Download or read book BALLISTICS 2014 written by Richard G. Ames and published by DEStech Publications, Inc. This book was released on 2014-10-01 with total page 951 pages. Available in PDF, EPUB and Kindle. Book excerpt: Original research from around the world on weapons-grade projectiles, warheads, missiles, guns and their effects on target materialsNew information on shaped charges, fire, control strategies, simulation, blast resistance, non-lethal systems and more190 original presentations in two printed volumes, plus searchable CD The first part of this 2-volume set, part of an ongoing series, presents previously unpublished research on the design and modeling of ballistic devices ranging from shells to missiles, including explosives, propellants and internal components. The second part investigates the effects of ballistic penetrants on a variety of targets, including human models, as well as hard targets and diverse armors made from engineered fibers, ceramics, metal alloys and concrete. Data is included on the modeling and testing of novel devices, explosives and shielding strategies. Papers in this text were presented at a symposium organized by the National Defense Industrial Association with the International Ballistics Society. The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article. Search features on the CD-ROM can be by full text including all key words, article title, author name, and session title. The CD-ROM has Autorun feature for Windows 2000 with Service Pack 4 or higher products along with the program for Adobe Acrobat Reader with Search 11.0. One year of technical support is included with your purchase of this product.
Book Synopsis International Journal of Engineering Research in Africa by : Trans Tech Publications, Limited
Download or read book International Journal of Engineering Research in Africa written by Trans Tech Publications, Limited and published by Trans Tech Publications Ltd. This book was released on 2019-02-25 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 41st volume of International Journal of Engineering Research in Africa contains articles describing the research results in the fields of materials science, mechanical engineering, control, wireless sensor networks, construction materials and technologies, technological processes and materials in the chemical production, freight transportation and structural analysis of production systems. The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.
Book Synopsis Characterization and Modeling of Sheared Edge Failure in Advanced High Strength Steel by : Nikky Pathak
Download or read book Characterization and Modeling of Sheared Edge Failure in Advanced High Strength Steel written by Nikky Pathak and published by . This book was released on 2018 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edge failure is one of the major problems associated with forming of advanced high strength steels (AHSS) such as dual-phase (DP) steels. The development of ferritic-bainitic steels such as complex-phase (CP) steels have improved the performance of AHSS in industrial forming operations and is gaining attention in academia as well as industry. As a result, there is an interest in developing numerical techniques to predict sheared edge failure in forming simulations and optimize forming operations in the automotive industry for vehicle lightweighing. The primary objective of this thesis is to examine the influence of shearing on edge stretchability and damage evolution in two different grades of AHSS: CP and DP steels and develop damage-based models to predict sheared edge failure. The stretch-flangeability of DP and CP steels were evaluated using a hole expansion test for different edge conditions to isolate to the influence of a range of factors thought to influence edge formability. The results demonstrate that work hardening and void damage at the sheared edge govern formability while the sheared surface quality plays a minor or secondary role. A comparison of the edge stretching limits of DP and CP steels demonstrates the advantages of a ferritic-bainitic microstructure for forming operations with severe local deformation as in a stretch-flanging operation. The failure mechanisms in the CP and DP steels were systematically characterized by interrupting hole tension tests at different strain levels. Scanning electron microscope (SEM) analysis conducted on interrupted hole tension specimens revealed the ductile failure mechanism as being operative in the CP and DP steels for the different edge conditions and microstructures. Damage histories were developed from the interrupted samples using optical microscopy and quantitative stereology measurement of void nucleation, growth and coalescence, paired with in situ digital image correlation (DIC) strain measurements during the mechanical testing. The trend of damage evolution differs for the sheared edge in contrast with the reamed edge because the shearing process alters the microstructure in the shear affected zone (SAZ) by introducing work-hardening and damage behind the sheared edge. Two independent experimental techniques were applied to characterize the residual strain distribution within the shear-affected zone for CP800 and DP780 steels based on (a) the tendency of grains to orient in the direction of shearing and (b) work-hardening introduced within the deformed shear zone. The first technique was developed by applying finite strain theory to calculate the equivalent strain from microstructural measurements of grain rotation. The second strain measurement technique also involved using the same interrupted shear tests and DIC strains followed by microhardness measurements to develop a correlation between the equivalent strain and hardness. These techniques were applied to estimate the strain-distribution behind the sheared edge generated during the shearing process. The influence of stress-state on micro-void nucleation was evaluated experimentally for the CP and DP steels and a stress-state dependent nucleation model was developed. Stress state was varied by considering four specimen geometries: the equi-biaxial Nakazima test, a plane strain v-bend test, a central hole tension test for uniaxial loading and a simple shear test. 3D micro-tomography and quantitative stereology measurement of void nucleation paired with in situ digital image correlation (DIC) strain measurement was conducted on the interrupted samples to quantify damage as a function of equivalent strain. The influence of stress-state on damage evolution was observed for both materials with very little void nucleation under shear deformation but extensive void damage under biaxial tension. Of particular interest, Lode parameter-dependency of void nucleation was identified and a stress-state dependent nucleation model is proposed by introducing a nucleation strain surface as a function of stress-triaxiality and Lode parameter using a modified form of Chu and Needleman nucleation criterion. The critical damage parameters controlling the ductile failure process were identified from the void histories determined using 3D tomography to develop a micromechanics-based fracture model. An uncoupled anisotropic damage-based fracture model was formulated within an LS-DYNA user-defined material subroutine. The pre-strain and damage introduced during the shearing process were mapped onto finite element models of edge formability. The proposed model was validated for the hole tension experiments and found to predict failure efficiently and accurately for the CP800 and DP780 alloys with a reamed or sheared edge conditions.
Book Synopsis Introduction to Texture Analysis by : Olaf Engler
Download or read book Introduction to Texture Analysis written by Olaf Engler and published by CRC Press. This book was released on 2009-11-16 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of Introduction to Texture Analysis: Macrotexture, Microtexture, and Orientation Mapping broke new ground by collating seventy years worth of research in a convenient single-source format. Reflecting emerging methods and the evolution of the field, the second edition continues to provide comprehensive coverage of the concepts, pra
Book Synopsis Characterization and Modeling of Advanced High Strength Steels by : Jun Hu
Download or read book Characterization and Modeling of Advanced High Strength Steels written by Jun Hu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling of Mechanical Properties and Local Deformation of High-strength Multi-phase Steels by :
Download or read book Modelling of Mechanical Properties and Local Deformation of High-strength Multi-phase Steels written by and published by . This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-strain-rate Property Determination of High-strength Steel Using Finite Element Analysis and Experimental Data by : Jeremy M. Schreiber
Download or read book High-strain-rate Property Determination of High-strength Steel Using Finite Element Analysis and Experimental Data written by Jeremy M. Schreiber and published by . This book was released on 2013 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Simulation of Dynamic Failure Under Fully Plane Strain Loading Conditions by : Youngseog Lee
Download or read book Finite Element Simulation of Dynamic Failure Under Fully Plane Strain Loading Conditions written by Youngseog Lee and published by . This book was released on 1997 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: An explicit finite element code is developed for solving transient coupled thermo-mechanical elastic-viscoplastic initial-boundary value problems. The usefulness of the code is demonstrated by studying the edgewise propagation of plastic shear instability from the tip of a pre-existing crack in a high strength structural steel (4340VAR). Material failure algorithms incorporated into the code are utilized in a series of finite element simulations carried out to obtain descriptions of low temperature dynamic fracture of the steel.
Book Synopsis The Causes of "shear Fracture" of Dual-phase Steels by : Ji-Hyun Sung
Download or read book The Causes of "shear Fracture" of Dual-phase Steels written by Ji-Hyun Sung and published by . This book was released on 2010 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Dual Phase (DP) steels are a class of advanced high strength steel (AHSS) in increasing use for sheet formed automotive parts. In spite of attractive combinations of high strength, high ductility, and low cost, the widespread adoption of DP steels has been limited because practical die tryouts exhibit forming failures far earlier than predicted by standard industrial methods. These failures, often referred to as "shear fractures," occur in regions of high curvature and with little apparent necking, in contrast to "normal" or tensile fractures. Conventional wisdom attributes shear fractures to a postulated damage mechanism related to the special microstructure of DP steels. In order to reproduce, characterize, and analyze such fractures in a laboratory setting and to understand their origin of the inability to predict them, a novel draw-bend formability (DBF) test was devised based on displacement control. DP steels from several suppliers with tensile strengths ranging from 590 to 980 MPa were tested over a range of rates and bend ratios (R/t, inner bend radius / sheet thickness). The new DBF test reliably reproduced three kinds of fractures identified as Type I, II, and III, corresponding to tensile fracture, transitional fracture, and shear fracture, respectively. These tests revealed a surprising result: the occurrence of shear fractures increased at higher deformation rates. This degradation of formability was shown to be principally a result of deformation-induced heating, which is greatly accentuated for AHSS because of their high plastic energy absorption and commensurate high temperature increases, up to 100 degrees C. In order to understand and quantify the role of deformation-induced heating on plastic localization, temperatures were measured and simulated using a novel new empirical plasticity constitutive form describing the flow stress as a function of strain, strain-rate, and temperature. Designated the "H/V model", the new constitutive model consists of three multiplicative functions describing (a) strain hardening and its temperature sensitivity, (b) strain-rate sensitivity, and (c) temperature sensitivity. This form allows a natural transition from unbounded strain hardening at low temperatures toward saturation behavior at higher temperatures, consistent with many observations. Thermo-mechanical finite-element simulations using the H/V model confirmed its accuracy and the magnitude of the role on shear fracture. Failure types were predicted, as well as quantitative. For most of the DP steels tested, heating induced by deformation was identified as the dominant effect in producing unpredicted fractures. This is a result of standard industrial techniques that do not take non-isothermal effect into account, in particular constructing forming limit diagrams from low-speed / isothermal testing, and use of isothermal finite element modeling to analyze industrial sheet forming operations. Microstructural damage can also contribute to shear fracture, but it was a secondary factor for all but one of the alloys tested, in one test direction.
