Download or read book Rate Effects in the Constitutive Modeling of Concrete and Geomaterials Including Plasticity and Damage written by Vassilis P. Panoskaltsis and published by . This book was released on 1992 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frank L Di Maggio Symposium on Constitutive Modeling of Geomaterials June 3 5 2002 written by Hoe I. Ling and published by CRC Press. This book was released on 2003-01-23 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists involved with geomaterial modeling honor the retirement of distinguished colleague Frank L. DiMaggio (civil engineering and engineering mechanics, Columbia U.) by offering contributions representing recent advances in the modeling of sand, clay, and concrete. DiMaggio contributed to the d
Download or read book Strain Rate Effects for Concrete and Fiber Reinforced Concrete Subjected to Impact Loading written by Surendra P. Shah and published by . This book was released on 1987 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1992 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Degradations and Instabilities in Geomaterials written by Félix Darve and published by Springer Science & Business Media. This book was released on 2004-11-24 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most recents developments in the modelling of degradations (of thermo-chemo-mechanical origin) and of bifurcations and instabilities (leading to localized or diffuse failure modes) taking place in geomaterials (soils, rocks, concrete). Applications (landslides, rockfalls, debris flows, concrete and rock ageing, etc.) are discussed in detail.
Download or read book Survey of Four Damage Models for Concrete written by and published by . This book was released on 2009 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four conventional damage plasticity models for concrete, the Karagozian and Case model (K & C), the Riedel-Hiermaier-Thoma model (RHT), the Brannon-Fossum model (BF1), and the Continuous Surface Cap Model (CSCM) are compared. The K & C and RHT models have been used in commercial finite element programs many years, whereas the BF1 and CSCM models are relatively new. All four models are essentially isotropic plasticity models for which 'plasticity' is regarded as any form of inelasticity. All of the models support nonlinear elasticity, but with different formulations. All four models employ three shear strength surfaces. The 'yield surface' bounds an evolving set of elastically obtainable stress states. The 'limit surface' bounds stress states that can be reached by any means (elastic or plastic). To model softening, it is recognized that some stress states might be reached once, but, because of irreversible damage, might not be achievable again. In other words, softening is the process of collapse of the limit surface, ultimately down to a final 'residual surface' for fully failed material. The four models being compared differ in their softening evolution equations, as well as in their equations used to degrade the elastic stiffness. For all four models, the strength surfaces are cast in stress space. For all four models, it is recognized that scale effects are important for softening, but the models differ significantly in their approaches. The K & C documentation, for example, mentions that a particular material parameter affecting the damage evolution rate must be set by the user according to the mesh size to preserve energy to failure. Similarly, the BF1 model presumes that all material parameters are set to values appropriate to the scale of the element, and automated assignment of scale-appropriate values is available only through an enhanced implementation of BF1 (called BFS) that regards scale effects to be coupled to statistical variability of material properties. The RHT model appears to similarly support optional uncertainty and automated settings for scale-dependent material parameters. The K & C, RHT, and CSCM models support rate dependence by allowing the strength to be a function of strain rate, whereas the BF1 model uses Duvaut-Lion viscoplasticity theory to give a smoother prediction of transient effects. During softening, all four models require a certain amount of strain to develop before allowing significant damage accumulation. For the K & C, RHT, and CSCM models, the strain-to-failure is tied to fracture energy release, whereas a similar effect is achieved indirectly in the BF1 model by a time-based criterion that is tied to crack propagation speed.
Download or read book Constitutive Modeling of Engineering Materials written by Vladimir Buljak and published by Academic Press. This book was released on 2021-02-18 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constitutive Modeling of Engineering Materials provides an extensive theoretical overview of elastic, plastic, damage, and fracture models, giving readers the foundational knowledge needed to successfully apply them to and solve common engineering material problems. Particular attention is given to inverse analysis, parameter identification, and the numerical implementation of models with the finite element method. Application in practice is discussed in detail, showing examples of working computer programs for simple constitutive behaviors. Examples explore the important components of material modeling which form the building blocks of any complex constitutive behavior. - Addresses complex behaviors in a wide range of materials, from polymers, to metals and shape memory alloys - Covers constitutive models with both small and large deformations - Provides detailed examples of computer implementations for material models
Download or read book Handbook of Materials Behavior Models Three Volume Set written by Jean LeMaitre and published by Elsevier. This book was released on 2001-11-17 with total page 1231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first of a kind reference/handbook deals with nonlinear models and properties of material. In the study the behavior of materials' phenomena no unique laws exist. Therefore, researchers often turn to models to determine the properties of materials. This will be the first book to bring together such a comprehensive collection of these models. The Handbook deals with all solid materials, and is organized first by phenomena. Most of the materials models presented in an applications-oriented fashion, less descriptive and more practitioner-geared, making it useful in the daily working activities of professionals. The Handbook is divided into three volumes. Volume I, Deformation of Materials, introduces general methodologies in the art of modeling, in choosing materials, and in the "so-called" size effect. Chapters 2-5 deal respectively with elasticity and viscoelasticity, yield limit, plasticity, and visco-plasticity. Volume II, Failures in Materials, provides models on such concerns as continuous damage, cracking and fracture, and friction wear. Volume III, Multiphysics Behavior, deals with multiphysics coupled behaviors. Chapter's 10 and 11 are devoted to special classes of materials (composites, biomaterials, and geomaterials). The different sections within each chapter describe one model each with its domain of validity, its background, its formulation, the identification of material parameters for as many materials as possible, and advice on how to implement or use the model. The study of the behavior of materials, especially solids, is related to hundreds of areas in engineering design and control. Predicting how a material will perform under various conditions is essential to determining the optimal performance of machines and vehicles and the structural integrity of buildings, as well as safety issues. Such practical examples would be how various new materials, such as those used in new airplane hulls, react to heat or cold or sudden temperature changes, or how new building materials hold up under extreme earthquake conditions. The Handbook of Materials Behavior Models: Gathers together 117 models of behavior of materials written by the most eminent specialists in their field Presents each model's domain of validity, a short background, its formulation, a methodology to identify the materials parameters, advise on how to use it in practical applications as well as extensive references Covers all solid materials: metals, alloys, ceramics, polymers, composites, concrete, wood, rubber, geomaterials such as rocks, soils, sand, clay, biomaterials, etc Concerns all engineering phenomena: elasticity, viscoelasticity, yield limit, plasticity, viscoplasticity, damage, fracture, friction, and wear
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Constitutive Models written by Jerry A. Yamamuro and published by Amer Society of Civil Engineers. This book was released on 2005-01 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: GSP 128 contains papers by 19 prominent constitutive modelers presented at the Geo-Frontier Conference, held in Austin, Texas, January 24-26, 2005.
Download or read book A Thermodynamic Approach to Constitutive Modelling of Concrete Using Damage Mechanics and Plasticity Theory written by Giang Dinh Nguyen and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Modeling of Damage and Fracture in Concrete written by Ferhun Cem Caner and published by . This book was released on 2000 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study presents a microplane-based constitutive model for concrete, called "M4" where the constitutive law is characterized as a relation between normal, volumetric, deviatoric and shear stresses and strains on variously oriented planes, called "microplanes". The microplane strain components are projections of the continuum strain tensor, and continuum stresses are obtained from the microplane stresses using the virtual work principle. An explicit numerical algorithm is formulated, its material parameters are calibrated and verified using the basic test data available in literature. Next, the model is extended to rate dependence. Two types of rate effect in nonlinear triaxial behavior of concrete are distinguished: (1) rate dependence of fracturing (microcrack growth) associated with activation energy of bond ruptures, (2) short-time creep (viscoelasticity). The main reason that (1) must be taken into account is to simulate a sudden reversal of post-peak strain softening into hardening with a sudden increase in rate of loading discovered recently. The rate dependence of initial and unloading stiffnesses requires (2) to be taken into account. The resulting model is suitable for finite element analysis of dynamic problems. Furthermore, the vertex effect on inelastic response is determined experimentally using state-of-the-art testing equipment. This effect is crucial in dynamics where load paths are often non-proportional. The experimental data obtained are simulated using finite element analyses with model M4 in both one and three dimensions, without recalibration. Furthermore, the three dimensional finite element analyses are repeated using an advanced fracture-plastic model calibrated to fit these particular data. Comparison of these results show that model M4 can simulate the vertex effects while the fracture-plastic models cannot. The physical reason behind the vertex effect is discussed. Finally, the critical reinforcement ratio required for concrete-filled tubular steel columns to achieve a ductile inelastic axial load-displacement response is determined using laboratory tests and their rigorous finite strain finite element simulations with model combined with a microplane model for steels.
Download or read book Constitutive Relations of Concrete Subjected to a Varying Strain Rate written by S. P. Shah and published by . This book was released on 1983 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments conducted on concrete subjected to impact loading in uniaxial tension, uniaxial compression and in flexure, indicate that (1) the strain effects in concrete are not isotropic, (2) the stress-strain curves becomes less non-linear with increasing strain rate and (3) the rate of growth of internal microcracking decreases with increasing strain rate. A continuous damage model is proposed to establish the constitutive relationship of concrete. To include the effect of strain rate on internal damage, an inertial term is introduced in the damage evolution equation. The damage is expressed as a tensor quantity. The Hermholtz free energy function is expressed in terms of both the invariants of strain tensors and damage tensors. Equations predicted by the model are compared with the experimental results. (Author).
Download or read book Foundations of Elastoplasticity Subloading Surface Model written by Koichi Hashiguchi and published by Springer Nature. This book was released on 2023-06-12 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the standard text book for elastoplasticity/viscoplasticity which is explained comprehensively covering the rate-independent to -dependent finite deformations of metals, soils, polymers, crystal plasticity, etc. and the friction phenomenon. Concise explanations on vector-tensor analysis and continuum mechanics are provided first, covering the underlying physical concepts, e.g. various time-derivatives, pull-back and push-forward operations, work-conjugacy and multiplicative decomposition of deformation gradient tensor. Then, the rigorous elastoplastic/viscoplastic model, called the subloading surface model, is explained comprehensively, which is based on the subloading surface concept to describe the continuous development of the plastic/viscoplastic strain rate as the stress approaches to the yield surface, while it can never be described by the other plasticity models, e.g. the Chaboche-Ohno and the Dafalias-Yoshida models assuming the purely-elastic domain. The main features of the subloading surface model are as follows: 1) The subloading surface concept underling the cyclic plasticity is introduced, which insists that the plastic deformation develops as the stress approaches the yield surface. Thus, the smooth elastic-plastic transition leading to the continuous variation of the tangent stiffness modulus is described always. 2) The subloading-overstress model is formulated by which the elastoplastic deformation during the quasi-static loading and the viscoplastic deformation during the dynamic and impact loading can be described by the unified equation. Then, only this model can be used to describe the deformation in the general rate of deformation, disusing the elastoplastic constitutive equation. 3) The hyperelastic-based (visco)plasticity based on the multiplicative decomposition of deformation gradient tensor and the subloading surface model is formulated for the exact descriptions of the finite elastic and (visco)plastic deformations. 4) The subloading-friction model is formulated for the exact description of the dry and the fluid (lubricated) frictions at the general rate of sliding from the static to the impact sliding. Thus, all the elastic and inelastic deformation/sliding phenomena of solids can be described accurately in the unified equation by the subloading-overstress model. The subloading surface model will be engraved as the governing law of irreversible deformation of solids in the history of solid mechanics.
Download or read book Size Effect in Concrete Materials and Structures written by Xiuli Du and published by Springer Nature. This book was released on 2020-12-31 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book gathers a large amount of the recent research results on this topic to provide a better understanding of the size effect by giving a quantitative description of the relationship between the properties of engineering concrete-making material (e.g. the nominal strength) and the corresponding structure size. To be precise, this is about to explore the new static and dynamic unified size effect laws for concrete materials, as well as size effect laws for concrete components. Besides presenting clear and accurate descriptions that further deepen our fundamental knowledge, this book provides additionally useful tools for the scientific design of concrete structures in practical engineering applications.
Download or read book Plasticity written by Ronaldo I. Borja and published by Springer Science & Business Media. This book was released on 2013-06-14 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been many excellent books written on the subject of plastic deformation in solids, but rarely can one find a textbook on this subject. “Plasticity Modeling & Computation” is a textbook written specifically for students who want to learn the theoretical, mathematical, and computational aspects of inelastic deformation in solids. It adopts a simple narrative style that is not mathematically overbearing, and has been written to emulate a professor giving a lecture on this subject inside a classroom. Each section is written to provide a balance between the relevant equations and the explanations behind them. Where relevant, sections end with one or more exercises designed to reinforce the understanding of the “lecture.” Color figures enhance the presentation and make the book very pleasant to read. For professors planning to use this textbook for their classes, the contents are sufficient for Parts A and B that can be taught in sequence over a period of two semesters or quarters.
Download or read book Constitutive Modeling and Numerical Implementation of Brittle and Ductile Material Behavior with the Aid of Inelastic XFEM and Damage plasticity Models written by Shahriyar Beizaee and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Constitutive equations establish the relationship between kinetic with kinematic quantities to characterize the specific properties of the material. Mechanical constitutive relations are formulated to describe nonlinear and inelastic response behavior as well as brittle or ductile failure of metallic and cementitious materials in form of plastic and damage material formulations. This dissertation addresses three topics: The first topic is focused on the peak response behavior of brittle and ductile materials by coupling plasticity with extended finite element method in order to model and follow discrete crack initiation and fracture propagation. This is accomplished by exploiting appropriate crack initiation criteria and performing analytical and numerical localization analysis to determine the critical orientation of the emerging failure surface. A series of experiments are performed on perforated metallic flat bars and the observations are used to validate the computational failure predictions. The second topic is the finite element approximation of the field data obtained by photogrammetric non-contact digital image correlation analysis. This study includes experimental observations on various perforated metallic flat bars to evaluate displacements and strains by using digital image correlation analysis. The displacement images are used in order to determine the best approximation of finite element nodal displacement values based on least square approximation of the optical measurement data. Moreover, infinitesimal and finite strains are calculated and contrasted with the results processed by the commercial Aramis imaging software. The last topic is focused on the localization of triaxial concrete behavior by a damage-plasticity model. In this constitutive formulation a three-invariant yield function is introduced to model plastic deformations and a damage function is used to determine the nonlinear and inelastic behavior of concrete. Coupling of the inelastic damage and plasticity processes is introduced by a damage variable that enters the plastic yield function in terms of the effective stress. Localization properties of the combined damage-plasticity model are studied and the differences of the damage vs. plasticity constituents are explored and compared. A series of experimental tests are performed on concrete cylinders in cyclic compression and digital images are recorded to provide complementary field data of surface deformations and cracks.
