Development Of Capability For Characterization Of Ceramic Ceramic Composites Part 2 High Temperature Characterization Of Sicw Sic Composites And Prediction Of Flexural Properties By Energy Method
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Development Of Capability For Characterization Of Ceramic Ceramic Composites Part 2 High Temperature Characterization Of Sicw Sic Composites And Prediction Of Flexural Properties By Energy Method
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Author :
language : en
Publisher:
Release Date : 1991
Development Of Capability For Characterization Of Ceramic Ceramic Composites Part 2 High Temperature Characterization Of Sicw Sic Composites And Prediction Of Flexural Properties By Energy Method written by 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.
The fracture and flexural behavior of monolithic SiC and SiC-whisker reinforced SiC composites (SiCw/SiC) have been investigated at room and elevated temperatures. Flexure and fracture tests were conducted in a four-point beam configuration at 230C, 800 deg C and 1200 deg C to study the effects of whisker reinforcements especially in respect of mechanical and thermal stability at high energy environments. Flexural strengths and fracture toughness data within the test temperature range are presented in graphical as well as in weibull form, and experimental observations are analyzed and discussed. Attempts have been made to predict the flexural properties of the composite by coupling the principle of minimization of potential energy and the rule of mixture. The deflection curve of a composite four-point beam coupon is found from an assumed Fourier series solution satisfying the geometric boundary conditions and using the rule of mixture. Strain compatibility conditions are applied to determine the axial displacement field and hence the flexural strain. Stresses on the matrix and fiber are then estimated under the assumption of isostrain conditions.
Development Of Capability For Characterization Of Ceramic Ceramic Composites Part 1 Effects Of Reinforcement Geometry On The Mechanical Properties Of Sicw Al2o3 Composites And Prediction Of Flexural Properties By Energy Method
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Author :
language : en
Publisher:
Release Date : 1991
Development Of Capability For Characterization Of Ceramic Ceramic Composites Part 1 Effects Of Reinforcement Geometry On The Mechanical Properties Of Sicw Al2o3 Composites And Prediction Of Flexural Properties By Energy Method written by 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.
The mechanical properties of ceramic composites change due to variations in the size and geometry of the reinforcement. In the present work the effects of SiC whisker (SiCw) and SiC platelets (SiCp) have been investigated on the mechanical properties of SiC/Al2O3 composites. The flexural properties of both whisker- and platelet-reinforced SiC/Al2O3 composites were measured using the four-point bend test. Fracture toughness was determined for both straight and chevron notched specimens. Scanning electron microscopy examination of the fractured surfaces was conducted to perform failure analyses and understand toughening mechanisms. The results of the investigation indicate that SICw/Al2O3 composite provides higher flexural strength and fracture toughness compared to SiCp/Al2O3 composite. During the hot pressing, the control of the orientation of the SiCp is extremely difficult and it appears to form a porous matrix structure which substantially lowers the strength. Moreover, low l/d ratio of SiCp has a major influence on the fracture toughness. Attempts have been made to predict the flexural properties of the composite by coupling the principle of minimization of potential energy and the rule of mixture. The deflection curve of a composite four-point beam coupon is found from an assumed Fourier series solution satisfying the geometric boundary conditions and using the rule of mixture. Strain compatibility conditions are applied to determine the axial displacement field and hence the flexural strain. Stresses on the matrix and fiber are then estimated under the assumption of isostrain conditions.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1992
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Science categories.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 1992
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Government publications categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1999
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aeronautics categories.
A High Temperature Testing System For Ceramic Composites
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-02
A High Temperature Testing System For Ceramic Composites written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-02 with categories.
Ceramic composites are presently being developed for high temperature use in heat engine and space power system applications. The operating temperature range is expected to be 1090 to 1650 C (2000 F to 3000 F). Very little material data is available at these temperatures and, therefore, it is desirable to thoroughly characterize the basic unidirectional fiber reinforced ceramic composite. This includes testing mainly for mechanical material properties at high temperatures. The proper conduct of such characterization tests requires the development of a tensile testing system includes unique gripping, heating, and strain measuring devices which require special considerations. The system also requires an optimized specimen shape. The purpose of this paper is to review various techniques for measuring displacements or strains, preferably at elevated temperatures. Due to current equipment limitations it is assumed that the specimen is to be tested at a temperature of 1430 C (2600F) in an oxidizing atmosphere. For the most part, previous high temperature material characterization tests, such as flexure and tensile tests, have been performed in inert atmospheres. Due to the harsh environment in which the ceramic specimen is to be tested, many conventional strain measuring techniques can not be applied. Initially a brief description of the more commonly used mechanical strain measuring techniques is given. Major advantages and disadvantages with their application to high temperature tensile testing of ceramic composites are discussed. Next, a general overview is given for various optical techniques. Advantages and disadvantages which are common to these techniques are noted. The optical methods for measuring strain or displacement are categorized into two sections. These include real-time techniques. Finally, an optical technique which offers optimum performance with the high temperature tensile testing of ceramic composites is recommended. Hemann, John Unspecified Center...
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1992
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Mechanics, Applied categories.
Processing And Properties Of Advanced Ceramics And Composites Iv
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Author : J. P. Singh
language : en
Publisher: John Wiley & Sons
Release Date : 2012-09-28
Processing And Properties Of Advanced Ceramics And Composites Iv written by J. P. Singh and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-28 with Technology & Engineering categories.
With contributed papers from the 2011 Materials Science and Technology symposia, this is a useful one-stop resource for understanding the most important issues in the processing and properties of advanced ceramics and composites. Logically organized and carefully selected, the articles cover the themes of the symposia: Innovative Processing and Synthesis of Ceramics, Glasses and Composites; Advances in Ceramic Matrix Composites; Solution-Based Processing of Materials; and Microwave Processing of Materials. A must for academics in mechanical and chemical engineering, materials and or ceramics, and chemistry.
Ceramic Abstracts
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Author :
language : en
Publisher:
Release Date : 1998
Ceramic Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Ceramics categories.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1987
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Power resources categories.