Doctoral Dissertations

Abstract

"This dissertation is divided into six sections. The first section includes a review of the literature on the mechanical properties of glass, including glass strength. Section two describes a study of the effects of composition of calcium aluminoborosilicate glasses on the inert and room temperature two-point bending failure characteristics of glass fibers, including fatigue and aging effects. Sections three and four include studies of the effects of composition and structure of alkali silicate and aluminosilicate glasses on the inert two-point bending fiber failure properties. Section five describes the inert two- point bending failure results of sodium borate glass fibers. Section six includes a study of the effects of melting time and temperature (i.e. thermal history) on the resulting two- point bending failure properties of glass fibers produced from a variety of glass compositions.

Throughout the course of this work, new experimental equipment and techniques were developed so that high quality failure measurements could be obtained. When glass melts were prepared to ensure homogeneity, the failure properties were shown to be sensitive to glass composition and structure and the reproducibility of the failure data was less than for a variety of different silicate glass compositions. Fibers have also been aged under controlled humidity and temperature conditions to characterize the effects of aging time on the failure strain. With the ability to produce and test high quality fiber, a new failure property of glass has been observed. Fibers tested under liquid nitrogen produce failure strains that depend on the testing rate of the two-point bending equipment. In the case of silica glass fibers, failure strain increases with increasing testing rate, an effect attributed to 'normal' inert fatigue behavior. However, some glasses, such as the high alkali silicates and soda lime silicates, show the opposite dependence of failure strain on testing rate, where slower testing rates produce greater failure strains (i.e. an "inert delayed failure effect"). With the ability to determine the intrinsic (flaw-free) failure properties of glass and the dependence of these properties on testing rate, a new insight to the understanding of glass failure and strength with relation to composition and structure may be possible"--Abstract, page iv.

Advisor(s)

Brow, Richard K.

Committee Member(s)

Day, D. E.
Hilmas, Greg
Smith, Jeffrey D.
Dharani, Lokeswarappa R.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Publisher

University of Missouri--Rolla

Publication Date

Fall 2004

Journal article titles appearing in thesis/dissertation

  • Strength and durability of alkaline-earth aluminoborosilicate glass fibers
  • Failure properties of modified silicate glass fibers
  • Failure properties of less brittle glasses
  • Failure properties of sodium borate glasses
  • Thermal history studies of glass

Pagination

xxvii, 350 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2004 Nathan Paul Lower, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Library of Congress Subject Headings

Glass -- Fatigue -- Testing
Strains and stresses
Fibrous composites -- Testing

Thesis Number

T 8634

Print OCLC #

61926290

Electronic OCLC #

1089812566

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://laurel.lso.missouri.edu/record=b5370675~S5

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