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The introductory sections contain a brief discussion of the general methods of producing fiber-reinforced composites and of the theory of fiber-reinforcement of metals. The body of the report describes research on fiber-reinforced metal matrix composites, and is organized according to metal matrix materials. For convenience, the report is divided into two sections: Low density matrices (including aluminum, magnesium, and titanium and their alloys) and high density matrices (cobalt, copper and its alloys, iron, lead-tin alloys, nickel and nickel alloys, silver, tantalum, and tungsten). (Author).
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.
The large-scale plastic deformation behavior of aluminum-stainless steel fiber composites was examined under conditions of simulated forging. With the load applied perpendicular to the direction of reinforcement, deformation occurs in a plane strain mode with no metal flow in the direction of fiber alignment. Two possible types of material damage are identified: (1) void formation in the matrix adjacent to the fibers and inter-fiber cracking of the matrix; (2) breaking of the fibers, leading to deviations from plane strain deformation. Forming limit criteria for both types of damage were established in terms of the normal and lateral pressures in the material. These pressures are related to the workpiece geometry and friction parameters of the system through plasticity theory. Thus, the forming limit criteria, in conjunction with plasticity theory, form the basis of a rational approach to design of processes for forging complex shapes from fiber-reinforced composite materials having a ductile matrix. (Author).
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.
`Metal-Matrix Composites' are being used or considered for use in a variety of applications in the automotive, aerospace and sporting goods industries. This book contains sixteen chapters, all written by leading experts in the filed, which focus on the processing, microstructure and characterization, mechanics and micromechanics of deformation, mechanics and micromechanics of damage and fracture, and practical applications of a wide variety of metal composites.A particularly noteworthy feature of this authoritative volume is its collection of state-of-the-art reviews of the relationships among processing, microstructural evolution, micromechanics of deformation and overall mechanical response.
This book contains fifteen papers based on the presentations made at the symposium on "Inelasticity and Micromechanics of Metal Matrix Composites" held at the University of Washington, USA, in mid-1994. The papers represent the most recent work conducted on inelasticity and micromechanics of metal matrix composites. The book is divided into two parts: Part I deals with the study of inelastic deformation in metal matrix composites, while Part II tackles the micromechanical aspects of metal matrix composites. The articles discuss different aspects of these two topics ranging from purely theoretical treatments to extensive experimental investigations. Many of the papers are by prominent researchers working in this area.
This book is the first of its kind to deal with fabrication processes of metal matrix composites (MMCs) theoretically, experimentally, systematically, and instructively. The theoretical bases of fabrication processes and recycling processes of MMCs are established in this volume. Most other books in the field are concerned with the mechanics of properties, which is not easy for readers to grasp, and they introduce fabrication processes only as techniques without theoretical discussion. Because this book provides a clear image of the fabrication processes of MMCs without using complicated mathematics, readers can use production theory to create new composites. Also, fundamental concepts of recycling of MMCs are given in this book for the first time so as to meet the demands for solving environmental problems. This work originally was published in Japanese and has attained a high reputation among Japanese professors and researchers in the field.
Provides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
This is a two-part study on the plastic deformation of the fiber-reinforced metal matrix composites. In the first part of the study, a plasticity theory is formulated to predict analytically the macroscopic and microscopic responses of the unidirectional fiber-reinforced metal matrix composites, loaded by axisymmetric composite stress states. The composites are made of isotropic, linearly elastic fibers, and elastic-plastic, nonhardening matrix of Mises type, and are assumed to be both plastically extensible and compressible. It is shown that the unidirectional composites experience kinematic hardening when loaded by axisymmetric composite stresses. The hardening and flow rules governing the kinematic hardening are formulated. The results obtained by the hardening and flow rules are compared with exact plasticity solutions based on the finite element method. A very good agreement is obtained both for proportional and general loading regimes. An approximate method for the determination of microstresses in the unidirectional Composites under axisymmetric loading is described. jg p4.