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Book 78th Conference on Glass Problems

Download or read book 78th Conference on Glass Problems written by S. K. Sundaram and published by John Wiley & Sons. This book was released on 2018-07-27 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 78th Glass Problem Conference (GPC) including the 11th Advances in Fusion and Processing of Glass (AFPG) Symposium is organized by the Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802 and The Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. The Program Director was S. K. Sundaram, Inamori Professor of Materials Science and Engineering, Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802. The Conference Director was Robert Weisenburger Lipetz, Executive Director, Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. Donna Banks of the GMIC coordinated the events and provided support. The Conference started with a half-day plenary session followed by technical sessions. The themes and chairs of four half-day technical sessions were as follows: Modeling, Sensors, and Furnace Design James Uhlik, Toledo Engineering Company, Inc., Toledo, OH and Michelle Korwin-Edson, Owen Corning Composite Solutions, Granville, OH Refractories & Testing Laura Lowe – North American Refractory Company, Pittsburgh, PA, Larry McCloskey – Anchor Acquisition, LLC, Lancaster, OH, and Laura Lowe – North American Refractory Company, Pittsburgh, PA and Larry McCloskey – Anchor Acquisition, LLC, Lancaster, OH Combustion Glenn Neff, Glass Service USA, Inc., Stuart, FL and Uyi Iyoha, Praxair Inc., Tonawanda, NY Environmental & Safety Phil Tucker, Johns Manville, Denver, CO and Elmer Sperry, Libbey Glass, Toledo, OH

Book Field Strength Effect on the Elastoplastic and Mechanical Properties of Single Modifier Aluminoborosilicate Glasses

Download or read book Field Strength Effect on the Elastoplastic and Mechanical Properties of Single Modifier Aluminoborosilicate Glasses written by Aubrey Fry and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical strength of glass far exceeds its measurable strength. The limiting factor is glass's sensitivity to surface flaws, largely due to handling. Silicate glasses are the largest commercially used glass family because they are highly versatile and can be designed with many enhanced properties. Decades worth of patents and scientific literature discuss intrinsic and extrinsic strengthening mechanisms that compensate for glass's sensitivity to surface damage, including thermal tempering, ion exchange, ceramming, lamination, etc. The focus of this dissertation is to explore the impact of modifier field strength on the mechanical response of aluminoborosilicate glasses designed to have intrinsic damage resistance. By exploring the strengthening mechanisms at the atomic level, it is possible to gain a deeper understanding of how the glass composition governs physical properties and its mechanical response. Based on the principle of topological adaptability, aluminoborosilicate (ABS) glasses can be designed with intrinsically high damage resistance if they incorporate three-coordinated boron atoms. Using a careful selection of network modifying ions, they can also be amenable for chemical strengthening. This dissertation provides a comprehensive investigation of the effect of field strength (FS) on intrinsic damage resistance considering three monovalent and three divalent modifiers in ABS glasses. Various aspects of mechanical properties were analyzed as a function of network modifier (NWM) field strength and the magnitude of the applied stress. Results from this work help to (i) reevaluate assumptions regarding glass structure, (ii) improve future mechanical testing procedures, and (iii) gain insights into the cracking behavior and deformation mechanisms in silicate glasses as a function of modifier field strength and applied stress. (1) Atomic Structure: The first major discovery from this work regards the atomic structure of high strain point, mixed former glasses. For the current ABS glasses, the ratio of network formers and the low concentration of modifier oxides, in addition to high processing temperatures, increases the entropic contribution to the glass structure such that the enthalpically driven modifier and network former (NWF) interactions are frustrated. Therefore, in such systems it cannot be assumed that all Al3+ cations will be four-coordinated even if [NWM] >= [Al2O3] (concentrations denoted by square brackets). (2) Hardness and Crack Resistance: The second major discovery from this work addresses the simultaneous increase of both hardness (H) and crack resistance (CR) as a function of modifier field strength. Historically, an increase in H is presumably marked by an increase in rigidity and the probability of crack initiation. This is not the case for the current compositions, which brings the assumption of the inverse relationship between H and CR into question, specifically for glasses that might not be classified as normal. (3) Plasticity: The third discovery of this work involves the nuanced relationship between H, CR, and plasticity. Plasticity (VP) increases with modifier field strength, similar to H and CR. These findings appear counterintuitive since hardness is a measure of resistance to plastic deformation. It is found that a balance of plastic deformation mechanisms, namely, shear flow and densification, allow for an increase in H, CR, and plasticity as a function of field strength. (4) Topological Adaptability: The fourth major finding from this dissertation involves the predominant assumptions regarding topological adaptability. The topological adaptability is mainly attributed to two mechanisms: (i) the reduction in free volume under an applied stress (e.g., a decrease in bond length or angle), and (ii) structural unit conversion under an applied stress (e.g., NWF coordination changes). The first attribute is quantified by a decrease in molar volume (VM) post indentation or compression, and the second attribute is enabled by an initially high concentration of three-coordinated boron ([B3]). It is generally accepted that CR increases as topological adaptability is enhanced. The ABS glasses in this study were designed to take advantage of both mechanisms, while changing the modifier FS. Although this work did not systematically explore the impact of varying VM and [B3] on CR, it did show that CR increased as VM decreased. While this work implies that the topological adaptability can be helped or hindered based on the modifier species, future work needs to be done to systematically monitor changes in VM and CR as a function of varying [B3] in a series of related ABS glasses. (5) Poisson's Ratio: The fifth discovery from this research is that the suggested link between Poisson's ratio and cracking behavior should be reexamined. The elastic modulus increases with field strength but the Poisson's ratio did not trend with any measured property, namely, the VM and CR. Poisson's ratio has been touted as holding the key to understand cracking behavior in oxide glasses, but this is not the case for the current compositions. This misconception is likely due to the large amount of research conducted on normal (e.g., soda-lime silicate) and anomalous (e.g., pure silica) glasses which tend to ignore the intermediate glasses or mixed former glasses. (6) Elastic to Plastic Ratio: The sixth finding of this research has a direct connection to application: the mechanical performance of glass under increasing stress. The elastic-to-plastic deformation ratio (VE/VP) increases as the applied load increases. For the current compositions, a higher load results in a greater elastic response, which may help to explain static vs dynamic fatigue phenomena where a glass appears to be "stronger" when tested at higher strain rates. (7) Fracture Toughness: The seventh major discovery of this work is that the fracture toughness (KIc) of the alkaline earth glasses increases as a function of modifier field strength. Predicting fracture toughness has eluded many researchers both in ceramic and glass sciences. KIc has been related to a variety of material properties, but there is no universal predictor for how a material will perform during a fracture toughness test, especially since property trends are often found to deviate when changing the length scale of the test. From this work, results indicate that the hardness (micro-scale), crack resistance (meso-scale), fracture toughness (meso- to macro-scale), and the elastic moduli (bulk) all increase in ABS glasses with increasing FS, which has not been shown before. Additionally, the material property that had the highest linear correlation with KIc was VE/VP, indicating that a volumetric recovery study may serve as a new micro-scale test that can help predict the fracture toughness performance of ABS glasses. The goal of this dissertation is to explore the impact of glass composition on the elastoplastic response and mechanical performance of six novel single modifier aluminoborosilicate glasses. This work finds that modifier FS has a distinct role influencing mechanical properties and cracking behavior, even at modifier concentrations of around 10 mole percent. By rethinking glass chemistry accounting for these effects, properties such as hardness, crack resistance, elastic modulus, and even fracture toughness can be improved.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Borate Glasses

Download or read book Borate Glasses written by L. D. Pye and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron Oxide plays a key role in numerous glasses of high technological importance, yet its role in glass structure is far from clear. Indeed, in recent years there have been serious chal lenges to previous structure concepts for both crystalline and glassy borates. These challenges were sufficient to warrant a re examination of the structure of borate glasses using the most pow erful tools currently available. To provide a suitable forum for this undertaking, a four-day conference on "Boron in Glass and Glass Ceramics" was convened at Alfred University, June 3-8, 1977 to review the best scientific thinking on structure and to debate conflicting views and discuss properties and applications of borate glasses. This conference was also the first in a New University series on Glass Science to be rotated among Alfred University, The Pensyl vania State University, Rensselaer Polytechnic Institute, and the University of Missouri-Rolla. The present volume represents the proceedings of the first conference in this series. The volume begins with a review of the remarkable contribution of Jan Krogh-Moe to the understanding of the structure of Borate glasses. This review, authored by Professor N. J. Kreidl, concludes by dedicating the proceedings of this conference as a Krogh-Moe Fest schrift. The volume continues with a historical review by D. L. Griscom, originally prepared for circulation to the contributors prior to the conference. An Epilogue to the opening chapter brings the survey up-to-date in light of the conference papers.

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 32 (thesis year 1987) a total of 12,483 theses titles from 22 Canadian and 176 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 32 reports theses submitted in 1987, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Book Handbook of Glass Properties

Download or read book Handbook of Glass Properties written by Narottam P. Bansal and published by Academic Press. This book was released on 1986-05-28 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a compilation of data on the properties of glasses. The authors have critically examined and correlated the most reliable data on the properties of multicomponent commercial silicate glasses, vitreous silica, and binary and ternary laboratory glasses. Thermodynamic, thermal, mechanical, electrical, and transport properties are covered. Measurement methods and appropriate theories are also discussed.

Book Physics and Chemistry of Glasses

Download or read book Physics and Chemistry of Glasses written by and published by . This book was released on 2005 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book NBS Special Publication

Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mechanical and Thermal Properties of Ceramics

Download or read book Mechanical and Thermal Properties of Ceramics written by J. B. Wachtman and published by . This book was released on 1969 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Mechanical Properties of Water Soluble Silicate Glasses

Download or read book The Mechanical Properties of Water Soluble Silicate Glasses written by Charles Wesley Jennings and published by . This book was released on 1973 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Comprehensive Dissertation Index

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Temperature Mechanical Behaviour of Ceramic Composites

Download or read book High Temperature Mechanical Behaviour of Ceramic Composites written by Karl Jakus and published by Elsevier. This book was released on 1995-06-28 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Temperature Mechanical Behavior of Ceramic Composites provides an up-to-date comprehensive coverage of the mechanical behavior of ceramic matrix composites at elevated temperatures. Topics include both short-term behavior (strength, fracture toughness and R-curve behavior) and long-term behavior (creep, creep-fatigue, delayed failure and lifetime). Emphasis is on a review of fundamentals and on the mechanics and mechanisms underlying properties. This is the first time that complete information of elevated temperature behavior of ceramic composites has ever been compacted together in a single volume. Of particular importance is that each chapter, written by internationally recognized experts, includes a substantial review component enabling the new material to be put in proper perspective. Shanti Nair is Associate Professor at the Department of Mechanical Engineering at the University of Massachusetts at Amherst. Karl Jakus is Professor at the University of Massachusetts at Amherst.

Book Nuclear Science Abstracts

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1971 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt: NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.