Download or read book Compressive Strength and Indentation Damage in Ceramic Materials written by James Lankford (Jr) and published by . This book was released on 1978 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The threshold loads and crack sizes for indentation cracking were investigated for a number of ceramics using scanning electron microscopy and acoustic emission. It was found that the cracking behavior could be predicted, using a fracture mechanics/dimensional analysis approach modified to take into account the stress field at an elastic-plastic indentation. Selected area electron channeling was used to characterize the extent of subsurface damage produced in ceramics during grinding and polishing operations. It was found that polishing damage depths can be correlated using a simple model based on a sliding elastic-plastic indenter. Finally, the effect of temperature and strain rate upon material removal and cracking threshold was analyzed, using recent experimental compressive strength and crack growth measurements as inputs to current predictive models. The results are shown to have surprising implications with regard to dynamic, high temperature indentation (particle impact). (Author).
Download or read book Compressive Strength and Damage Mechanisms in Ceramic Materials written by James Lankford and published by . This book was released on 1980 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compressive strength measurements as a function of temperature and loading rate, and microhardness measurements as a function of temperature, have been carried out for Al2O3, SiC, and Si3N4. Results are correlated in terms of current theories connecting compressive strength, hardness, fracture toughness, and indentation microfracture. It is found that while high loading rates can suppress high temperature intergranular compressive fracture in SiC, this is not true in Al2O3. The threshold crack size for indentation microfracture as a function of temperature seems to correlate at least as well (if not better) with compressive strength as with hardness, and temperature-controlled compressive fracture mechanisms seem to operate during indentation fracture at corresponding temperatures. (Author).
Download or read book Compressive Strength and Damage Mechanisms in Ceramic Materials I Temperature Strain Rate Dependence of Compressive Strength and Damage Mechanism in Aluminum Oxide II Threshold Microfracture During Elastic Plastic Indentation of Ceramics written by James Lankford and published by . This book was released on 1980 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of compression tests of Al2O3 performed over a wide range in temperature and strain rate are interpreted in terms of dominant damage mechanisms. It is shown that compressive failure in Al2O3 is caused by one of three different mechanisms, each based on tensile (Mode I) growth of predominantly axial microcracks, and each characteristic of a specific temperature-strain rate regime. The concepts developed should be applicable to other strong ceramics. In addition, indentation experiments were carried out for a variety of ceramics. It is found that the threshold for microfracture during elastic-plastic indentation corresponds to radial, rather than subsurface median, crack formation. This is contrary to the fundamental assumption of existing models for threshold crack nucleation by sharp indenters or particles; the results indicate the need to modify the stress field calculations used in these models. (Author).
Download or read book Compressive Strength Hardness and Identification Damage in Ceramic Materials written by James Lankford (Jr) and published by . This book was released on 1982 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardness and compressive strength of several strong ceramics are measured from room temperature to 1000 C. Similarities in behavior, and the results of microscopic examination, are interpreted in terms of the relative contributions of microplasticity and microfracture to material failure during compression testing and microhardness indentation. It is shown that microplasticity alone is an insufficient basis upon which to relate material response under the two test conditions, and that tensile microfracture is a significant contributor both to compressive failure and to subsurface indentation deformation, hence to hardness. Previous determinations of the strengths of several ceramics subject to impulsive loads were interpreted in terms of a theory based on material inertia. Recent experiments are described, which show that the dynamic strengthening mechanism is athermal, as required by the inertial theory, and that microcrack growth, rather than initiation, is suppressed by the inertial effect. Indentation microfracture measurements in the low load, near threshold regime were carried out using scanning electron microscopy. Results were interpreted in terms of existing theoretical treatments.
Download or read book Indentation Techniques in Ceramic Materials Characterization written by Ahmad G. Solomah and published by John Wiley & Sons. This book was released on 2012-04-11 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indentation techniques have become widely used in the characterization of brittle solids due to their simplicity, cost effectiveness, rapidness, and maybe most importantly, the indenter itself can be used as a mechanical microprobe in thin films, interfaces, grain boundaries, and nanocomposites. The papers in these proceedings cover measurement techniques, reliability of, and problems associated with this testing method. Also included is the application of nano-indentation technique, as a new frontier in brittle solids characterization, e.g., thin film and nano-composite materials. Proceedings of the symposium held at the 105th Annual Meeting of The American Ceramic Society, April 27-30, in Nashville, Tennessee; Ceramic Transactions, Volume 156.
Download or read book Mechanical Properties of Ceramics and Composites written by Roy W. Rice and published by CRC Press. This book was released on 2000-04-18 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review, evaluation, and summary of the dependence of mechanical properties on grain and particle parameters of monolithic ceramics and ceramic composites. Emphasizing the critical link between fabrication and ceramic performance, the book covers the grain dependence of monolithic properties and the dependence of ceramic, composite properties on grain and particulate parameters. It includes theoretical and conceptual background, pertinent models, experimental results, a data review, discussion, and a summary or recommendations. Illustrations feature microstructural details while graphs plot data on material hardness, compressive strength, and other pivotal variables.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture in Ceramic Materials written by A. G. Evans and published by William Andrew. This book was released on 1984 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics of Ceramics written by R.C. Bradt and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes, 9 and 10, of Fracture Mechanics of Ceramics constitute the proceedings of an international symposium on the fracture mechanics of ceramic materials held at the Japan Fine Ceramics Center, Nagoya, Japan on July 15, 16, 17, 1991. These proceedings constitute the fifth pair of volumes of a continuing series of conferences. Volumes 1 and 2 were from the 1973 symposium, volumes 3 and 4 from a 1977 symposium, and volumes 5 and 6 from a 1981 symposium all of which were held at The Pennsylvania State University. Volumes 7 and 8 are from the 1985 symposium which was held at the Virginia Polytechnic Institute and State University. The theme ofthis conference, as for the previous four, focused on the mechanical behavior ofceramic materials in terms of the characteristics ofcracks, particularly the roles which they assume in the fracture processes and mechanisms. The 82 contributed papers by over 150 authors and co-authors represent the current state of that field. They address many of the theoretical and practical problems ofinterest to those scientists and engineers concerned with brittle fracture.
Download or read book Mechanical Properties and Performance of Engineering Ceramics and Composites IV Volume 30 Issue 2 written by Dileep Singh and published by John Wiley & Sons. This book was released on 2009-12-15 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gain insight into the mechanical properties and performance of engineering ceramics and composites. This collection of articles illustrates the Mechanical Behavior and Performance of Ceramics & Composites symposium, which included over 100 presentations representing 10 countries. The symposium addressed the cutting-edge topics on mechanical properties and reliability of ceramics and composites and their correlations to processing, microstructure, and environmental effects.
Download or read book Mechanical Testing Methodology for Ceramic Design and Reliability written by David C. Cranmer and published by CRC Press. This book was released on 1998-02-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describing the theoretical aspects of chemistry and microstructure that affect mechanical properties, this work offers coverage of ceramic mechanical property measurement techniques for use in component design as well as lifetime and reliability predictions. It presents procedures from both room- and elevated-temperature applications.
Download or read book Indentation Damage in Ceramics written by Brian R. Lawn and published by . This book was released on 1987 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic processes of indentation damage in brittle ceramics have been studied. Attention has focused on the roles of material crystallography and microstructure in determining the nature of the damage pattern. Microscopy techniques, particularly transmission electron microscopy, have been used to characterize the attendant deformation and fracture of Vickers indentation sites. Strength, toughness, and wear measurements have been carried out on polycrystalline materials to ascertain how the damage characteristics influence the ensuing mechanical properties. It is concluded that material microstructure can be a crucial factor in structural design with ceramics.
Download or read book Structural Ceramics written by John Jr. Wachtman and published by Elsevier. This book was released on 2012-12-02 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Materials Science and Technology, Volume 29: Structural Ceramics presents an overview of structural ceramics. This book begins with a survey of potential uses, designs, and barriers of particular types of structural ceramics. The silicon carbide family, silicon nitride and sialon family, and transformation toughened ceramics are discussed in detail, followed by an analysis of the various processing routes of each family of structural ceramics. This publication concludes with a review of the tribology of structural ceramics, considering many applications for structural ceramics in heat engines and other machinery that involve moving parts which must often resist wear or erosion. This volume is recommended for engineers, scientists, and researchers concerned with structural ceramics.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compressive Strength and Damage Mechanisms in Ceramic Materials I The Role of Subcritical Tensile Microfracture Processes in Compression Failure of Ceramics II Electron Channeling Study of Fracture in Alumina Evidence for Crack Tip Plasticity written by James Lankford and published by . This book was released on 1981 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: The compressive strength of SiC, Si3N4, and Al2O3 is investigated over wide ranges in temperature and loading rate. Several distinct damage regimes are identified, all based upon tensile microfracture processes. Two aspects of the work are of special interest. The first is the identification of a high strain rate regime in which material inertial effects are responsible for unusually rapid strengthening; the basis for the effect is increased difficulty in either crack nucleation or extension. Secondly, it is found that at low loading rates, subcritical tensile microcrack growth is responsible for a thermally activated strength dependence. Selected area electron channeling experiments lead to the conclusion that the thermal activation process may involve crack tip plasticity. (Author).
Download or read book Functionally Graded Materials 2000 written by Kevin Trumble and published by John Wiley & Sons. This book was released on 2001-02-28 with total page 835 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functionally Graded Materials (FGM) has served as a unifying theme for interdisciplinary research for more than a decade. The biannual International Symposium on Functionally Graded Materials has provided a forum for research on materials with spatial variation in microstructures or chemistries and have brought together a small, but richly interactive, community of FGM researchers from university, industry, and government labs all around the world. This new volume brings to readers current advancements and information on the topic of Functionally Graded Materials. More than 150 researchers from 20 different countries came together in Estes Park, Colorado for FGM 2000 to bring this information to the rest of the research world. FGM continues to be a vigorous topic stimulating new materials research, and this proceedings will keep you informed of all the latest developments in this area. Proceedings of the 6th International Symposium on Functionally Graded Materials, Estes Park, Colorado, USA, September 10-14, 2000; Ceramics Transactions, Volume 114.
Download or read book Advances in Ceramic Armor IV written by Lisa Prokurat Franks and published by John Wiley & Sons. This book was released on 2009-02-11 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a one-stop resource, compiling current research on ceramic armor and addressing the challenges facing armor manufacturers. It is a collection of papers from The American Ceramic Society s 32nd International Conference on Advanced Ceramics and Composites, January 27-February 1, 2008. Topics include novel materials concepts for both vehicle and body armors, transparent ceramics for impact resistance, and more. This is a valuable, up-to-date resource for researchers in industry, government, or academia who are working with ceramic armor.
