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Author: YA. Bahei-El-Din Publisher: ISBN: Category : Bounds Languages : en Pages : 27
Book Description
Continuum modeling of the elastic-plastic behavior of fibrous composites is concerned with predictions of the macroscopic behavior of a composite aggregate, which consists of an elastic-plastic metal matrix reinforced by unidirectionally aligned elastic fibers. Mechanical properties and volume fractions of the phases are assumed to be known; the objective is to predict the overall response of the composite under incrementally applied uniform macroscopic stresses or strains in terms of the phase properties, and of the geometry of the microstructure. This paper reviews some recent solutions of this problem. Those include micromechanical models that derive the overall response from uniform local fields, and also models that approximate the actual non-uniform local fields and arrive at upper and lower bound solutions. Recent experimental results pertaining to plastic behavior of fibrous composite materials are also discussed.
Author: YA. Bahei-El-Din Publisher: ISBN: Category : Bounds Languages : en Pages : 27
Book Description
Continuum modeling of the elastic-plastic behavior of fibrous composites is concerned with predictions of the macroscopic behavior of a composite aggregate, which consists of an elastic-plastic metal matrix reinforced by unidirectionally aligned elastic fibers. Mechanical properties and volume fractions of the phases are assumed to be known; the objective is to predict the overall response of the composite under incrementally applied uniform macroscopic stresses or strains in terms of the phase properties, and of the geometry of the microstructure. This paper reviews some recent solutions of this problem. Those include micromechanical models that derive the overall response from uniform local fields, and also models that approximate the actual non-uniform local fields and arrive at upper and lower bound solutions. Recent experimental results pertaining to plastic behavior of fibrous composite materials are also discussed.
Author: M. S. Madhava Rao Publisher: ISBN: Category : Languages : en Pages : 42
Book Description
This is the second of a three-part study of the plastic deformation of unidirectional fibrous composites made of isotropic, linearly elastic fibers, and an elastic- plastic, non-hardening matrix of the Mises type. The results obtained in the first part for the case of axisymmetric loading of the composite are extended and refined. A new kinematic Hardening Rule II is derived, and an associated flow rule is formulated. An approximate method for the evaluation of the microstresses in the composite is described. The theory is verified by comparison with exact, finite element plasticity solutions for a composite cylinder model of the Be-Al, and B-Al systems. The agreement between the approximate and exact results is very satisfactory. (Author-PL).
Author: W. Steven Johnson Publisher: ASTM International ISBN: 080311270X Category : Fracture mechanics Languages : en Pages : 289
Book Description
Fourteen peer-reviewed papers on testing techniques, analysis approaches, and descriptions of various failure processes. From the Symposium on [title] held at Sparks, NV, April 1988. Annotation copyright Book News, Inc. Portland, Or.
Author: Yehia A. Bahei-El-Din Publisher: Springer Science & Business Media ISBN: 0306469359 Category : Technology & Engineering Languages : en Pages : 327
Book Description
The field of composite materials has seen substantial development in the past decade, New composite systems are being continually developed for various applications. Among such systems are metal, intermetallic, and superalloy matrix composites, carbon-carbon composites as well as polymer matrix composites. At the same time, a new discipline has emerged of active or smart materials, which are often constructed as composite or heterogeneous media and structures. One unifying theme in these diverse systems is the influence that uncoupled and coupled eigenfields or transformation fields exert on the various types of overall response, as well as on the respective phase responses. Problems of this kind are currently considered by different groups which may not always appreciate the similarities of the problems involved. The purpose of the IUTAM Symposium on Transformation Problems in Composite and Active Materials held in Cairo, Egypt from March 10 to 12, 1997 was to bring together representatives of the different groups so that they may interact and explore common aspects of these seemingly different problem areas. New directions in micromechanics research in both composite and active materials were also explored in the symposium. Specifically, invited lectures in the areas of inelastic behavior of composite materials, shape memory effects, functionally graded materials, transformation problems in composite structures, and adaptive structures were delivered and discussed during the three-day meeting. This book contains the printed contributions to the IUTAM Symposium.
Author: John M. Kennedy Publisher: ASTM International ISBN: 0803113854 Category : Ceramic-matrix composites Languages : en Pages : 260
Book Description
Of interest to researchers and practitioners in materials science, especially in the aerospace industry, 16 papers from a symposium in Atlanta, Georgia, November 1988 discuss the analysis, modeling, and behavior of both continuous and discontinuous ceramic and metal matrix composites, and methods of
Author: George J. Dvorak Publisher: ISBN: Category : Languages : en Pages : 35
Book Description
The purpose of this research program was to establish experimentally verified constitutive relations for isothermal elastic-plastic behavior of metal matrix fibrous composite materials. The theoretical part of the work was concerned with development of new constitutive models of elastic-plastic fibrous composite materials. Our goal was to identify modeling techniques which would permit derivation of overall instantaneous mechanical properties of the aggregate in terms of microstructural geometry and the properties of the phases. Since most fibers remain elastic until failure, the inelastic overall strains are caused by plastic deformation of the matrix. Therefore, an important objective was to find connections between the elastic-plastic deformation of the neat matrix and the composite, and to develop models which would utilize such connections in predictions of the overall response. Also, among the possible approaches to the problem, it was necessary to identify those which would offer a guarantee of accuracy in applications involving incremental loading which could be verified experimentally.
Author: George J. Dvorak Publisher: Springer Science & Business Media ISBN: 1461391091 Category : Technology & Engineering Languages : en Pages : 763
Book Description
Polymer composites were introduced for the aerospace industry as light, strong, stiff materials, and adopted by the construction and automobile industries, among others. Meanwhile, composite materials have been introduced to fulfill the uses that these conventional materials could not, such as in extreme environments. The research for new composites includes not only new polymer systems, but metals, ceramics and intermetallic systems as well. This volume contains a selection of recent work by leading researchers in micromechanics on the topics of prediction of overall properties of elastic, perfectly bonded systems, problems associated with inelastic deformation of the phase, debonding at interfaces and growth of distributed damage. Many familiar aspects of mechanical behavior, such as fatigue, fracture, strength and buckling, etc. have been reexamined and adapted for these new systems.
Author: Zheng-Ming Huang Publisher: Springer Science & Business Media ISBN: 3642229581 Category : Technology & Engineering Languages : en Pages : 307
Book Description
"Strength of Fibrous Composites" addresses evaluation of the strength of a fibrous composite by using its constituent material properties and its fiber architecture parameters. Having gone through the book, a reader is able to predict the progressive failure behavior and ultimate strength of a fibrous laminate subjected to an arbitrary load condition in terms of the constituent fiber and matrix properties, as well as fiber geometric parameters. The book is useful to researchers and engineers working on design and analysis for composite materials. Dr. Zheng-Ming Huang is a professor at the School of Aerospace Engineering & Applied Mechanics, Tongji University, China. Mr. Ye-Xin Zhou is a PhD candidate at the Department of Mechanical Engineering, the University of Hong Kong, China.
Author: George J. Dvorak Publisher: ISBN: Category : Languages : en Pages : 39
Book Description
Plastic deformation was studied in unidirectional fibrous composites made of isotropic, linearly elastic fibers, and an elastic-plastic, nonhardening matrix of the Mises type. Special attention was given to the effects of axisymmetric stress states. The composite exper-ienced kinematic hardening when loaded by axisymmetric composite stresses. A simple Hardening Rule I was derived and an associated flow rule was formulated. The results obtained from these rules were verified by comparison with exact finite element plasticity solutions for a cylindrical composite model of the B-A SYSTEM. Significant plastic macro-dilitation was found for certain loading directions in the axisymmetric composite stress plane. (Author, modified-PL).
Author: YA. Bahei-El-Din
Author: YA. Bahei-El-Din
Author: M. S. Madhava Rao
Author: W. Steven Johnson
Author: Yehia A. Bahei-El-Din
Author: John M. Kennedy
Author: George J. Dvorak
Author: George J. Dvorak
Author: Zheng-Ming Huang
Author: 
Author: George J. Dvorak