Toughening Mechanisms In Weak Matrix Ceramic Composites
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Toughening Mechanisms In Weak Matrix Ceramic Composites
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Author : Jowoong Ha
language : en
Publisher:
Release Date : 1991
Toughening Mechanisms In Weak Matrix Ceramic Composites written by Jowoong Ha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
"Tough behavior of ceramic matrix composites is closely related to the weak interface between fiber and matrix. The weak interfaces in composites have been provided by reducing the chemical bonding and the residual thermal stresses between constituents. A new way to introduce the weak interface by induced porosity or damaged zones, so called porosity toughening or damage toughening respectively, was proposed in this study to provide the rationale for guiding development of oxide/oxide composites. The existence of porosity toughening was examined by qualitative theoretical consideration and experiments. Porous oxide/oxide composites were fabricated using alumino-silicate fibers (Nextel 440) and magnesium alumino-silicate matrix (1:1 mixture of kaolinite and talc), and sintered at 1100 °C and 1200 °C. Both type of composites failed non-catastrophically in bending and tensile tests. The porous matrix composites showed the low ultimate strength of 12.7±3.4 MPa, but showed high work of fracture of 630±206 J/m2 for the specimens fired at 1100° C when tested in tension. Damaged zones or porous phases were introduced into the interface region of model composites and effects determined using single fiber pullout specimen or a single rod pullout specimen. Single fiber pullout specimens with a damaged zone (by the oxidation of SiC fiber in situ) produced higher frictional stress than debonding strength. Frictional stresses increased up to 6.4 ± 3.4 MPa as pullout of the damaged fiber proceeded. The porous phase was produced by coating alumina rods with zirconia or alumino-silicates fired at various temperatures. Distinct changes in pullout behavior were observed in data for the specimens with an alumino-silicate coating fired at 1450° C. Magnitudes of frictional stress and debonding strength of the interface were both less than 2 MPa. Both coatings produced a gradual change of the pullout load during the pullout tests"--Abstract, leaf iii
Toughening Mechanisms In Fiber Reinforced Ceramic Matrix Composites
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Author : Elizabeth Patricia Butler
language : en
Publisher:
Release Date : 1993
Toughening Mechanisms In Fiber Reinforced Ceramic Matrix Composites written by Elizabeth Patricia Butler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Ceramics categories.
Synergism Of Toughening Mechanisms In Whisker Reinforced Ceramic Matrix Composites
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Author : Antonios E. Giannakopoulos
language : en
Publisher:
Release Date : 1989
Synergism Of Toughening Mechanisms In Whisker Reinforced Ceramic Matrix Composites written by Antonios E. Giannakopoulos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Toughening Mechanisms In Whisker Short Fiber Reinforced Ceramic Matrix Composites At Elevated Temperatures
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Author : Andrew A. Wereszczak
language : en
Publisher:
Release Date : 1992
Toughening Mechanisms In Whisker Short Fiber Reinforced Ceramic Matrix Composites At Elevated Temperatures written by Andrew A. Wereszczak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Toughening Mechanisms In Ceramic Composites
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Author : E. R. Fuller Jr.
language : en
Publisher: Forgotten Books
Release Date : 2018-01-12
Toughening Mechanisms In Ceramic Composites written by E. R. Fuller Jr. and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-12 with Technology & Engineering categories.
Excerpt from Toughening Mechanisms in Ceramic Composites: Semi-Annual Progress Report for the Period Ending September 30, 1988 The achievement of higher efficiency heat engines and heat recovery systems requires the availability of high-temperature, high-performance structural materials. Structural ceramics and, more recently ceramic matrix composites have received particular attention for these applications due to their high strength and excellent resistance to corrosion, erosion and thermal shock. Even with these positive attributes, improved reliabil ity and extended lifetime under service conditions are necessary for strue tural ceramics and ceramic composites to gain wide industrial acceptance. This reliability is only achieved with improved knowledge of in-service damage modes and failure mechanisms, and the processing knowledge to improve this performance by microstructural modifications.' The inherent _problems are mechanical and chemical in nature and are enhanced by the high temperatures, reactive environments, and extreme thermal gradients and thermal cycling, to which these materials are subjected. With an objective of improved performance for heat engine/heat reccy ery applications, the nist program addresses these problems through a de termination and characterization of major toughening mechanisms in ceramic composites, examining both model crack-fiber systems and real composites. A key aspect of the program is a determination of the critical processing factors which influence microstructure and interfacial behavior in these materials, and which thereby influence these toughening mechanisms. The activities of the program are grouped under two major work areas, each designed to develop key data, associated test methods and companion predic tive models. The status of these two work areas are detailed below. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Toughening Mechanisms In Quasi Brittle Materials
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Author : S.P. Shah
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Toughening Mechanisms In Quasi Brittle Materials written by S.P. Shah and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
A variety of ceramic materials has been recently shown to exhibit nonlinear stress strain behavior. These materials include transformation-toughened zirconia which undergoes a stress-induced crystallographic transformation in the vicinity of a propagating crack, microcracking ceramics, and ceramic-fiber reinforced ceramic matrices. Since many of these materials are under consideration for structural applications, understanding fracture in these quasi-brittle materials is essential. Portland cement concrete is a relatively brittle material. As a result mechanical behavior of concrete, conventionally reinforced concrete, prestressed concrete and fiber reinforced concrete is critically influenced by crack propagation. Crack propagation in concrete is characterized by a fracture process zone, microcracking, and aggregate bridging. Such phenomena give concrete toughening mechanisms, and as a result, the macroscopic response of concrete can be characterized as that of a quasi-brittle material. To design super high performance cement composites, it is essential to understand the complex fracture processes in concrete. A wide range of concern in design involves fracture in rock masses and rock structures. For example, prediction of the extension or initiation of fracture is important in: 1) the design of caverns (such as underground nuclear waste isolation) subjected to earthquake shaking or explosions, 2) the production of geothermal and petroleum energy, and 3) predicting and monitoring earthquakes. Depending upon the grain size and mineralogical composition, rock may also exhibit characteristics of quasi-brittle materials.
Toughening Of A Particulate Reinforced Ceramic Matrix Composite
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Author : M. Taya
language : en
Publisher:
Release Date : 1989
Toughening Of A Particulate Reinforced Ceramic Matrix Composite written by M. Taya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
The toughening mechanism of particulate-reinforced/ceramic-matrix composites was attributed to the thermal residual stress field induced by the differential thermal expansions of the matrix and the particulate when the composite is cooled from the processing to room temperature. The measured increase 77 percent in toughness in a TiB2-particulate/SiC-matrix ceramic composite compared well with the predicted increase of 52 percent. Keywords: Toughening mechanism; Particulate-reinforced/ceramic-matrix composite; Thermal residual stress; Crack deflection model; Eshelby's model; Coefficient of thermal expansion. (SDW).
Ceramic Matrix Composites
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Author : R. Warren
language : en
Publisher: Springer Science & Business Media
Release Date : 1991-12-31
Ceramic Matrix Composites written by R. Warren and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-12-31 with Technology & Engineering categories.
By combining the properties and strengths of various materials it is possible to produce a hybrid or composite material with properties ideally suited to a specific application, and this is particularly important for developing new materials for rapidly growing high-technology industries.
Ceramic Matrix Composites
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Author : I M Low
language : en
Publisher: Woodhead Publishing
Release Date : 2006-01-25
Ceramic Matrix Composites written by I M Low and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-01-25 with Technology & Engineering categories.
The advent of engineering-designed polymer matrix composites in the late 1940s has provided an impetus for the emergence of sophisticated ceramic matrix composites. The development of CMCs is a promising means of achieving lightweight, structural materials combining high temperature strength with improved fracture toughness, damage tolerance and thermal shock resistance. Considerable research effort is being expended in the optimisation of ceramic matrix composite systems, with particular emphasis being placed on the establishment of reliable and cost-effective fabrication procedures. Ceramic matrix composites consists of a collection of chapters reviewing and describing the latest advances, challenges and future trends in the microstructure and property relationship of five areas of CMCs. Part one focuses on fibre, whisker and particulate-reinforced ceramic matrix composites, part two explores graded and layered ceramics, while the five chapters in part three cover nanostructured CMCs in some detail. Refractory and speciality ceramic composites are looked at in part four, with chapters on magnesia-spinel composite refractory materials, thermal shock of CMCs and superplastic CMCs. Finally, part four is dedicated to non-oxide ceramic composites. Ceramic matrix composites is a comprehensive evaluation of all aspects of the interdependence of processing, microstructure, properties and performance of each of the five categories of CMC, with chapters from experienced and established researchers. It will be essential for researchers and engineers in the field of ceramics and more widely, in the field of inorganic materials. Looks at the latest advances, challenges and future trends Compiled by experienced and established researchers in the field Essential for researchers and engineers
Toughening Mechanisms In Composite Materials
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Author : Qing-Hua Qin
language : en
Publisher: Elsevier
Release Date : 2015-05-26
Toughening Mechanisms In Composite Materials written by Qing-Hua Qin and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-26 with Technology & Engineering categories.
Toughening Mechanisms in Composite Materials aims to provide a comprehensive and technically detailed coverage of composites and their toughening mechanisms. Unique in its direct and comprehensive approach, the book presents fundamental knowledge on composites’ toughening mechanisms as well as a comprehensive treatment of numerical methods. This volume summarizes the current state-of-the-art and presents the most recent research outcomes in the field. It details the development of each of the techniques, beginning with basic principles, and new concepts are illustrated with examples wherever possible. Covers particle-reinforced composites, fibre-reinforced composites and other toughening mechanisms Analyses toughening mechanisms in a broad range of composite materials Developments in nanotube toughened composites and toughened graphene ceramic composites are examined