Doctoral Dissertations

Abstract

"Ceramic Matrix Composites (CMCs) represent an attractive class of engineering materials for use in high temperature, high wear and corrosive environments. Much effort has been made to ascertain and improve the strength and fracture characteristics of these materials. Approaches that have received a significant amount of attention include enhancing a ceramic material's mechanical properties through the use of continuous fiber reinforcement; fine, randomly dispersed discontinuous fiber (or whisker) reinforcement; and a hybrid combination of both continuous and discontinuous fibers. This dissertation addresses two important aspects of determining and improving the strength and toughness of CMCs and is comprised of three research papers that have been prepared for journal publication. The first paper, "Transverse Fracture Toughness of Unidirectional Continuous Fiber and Hybrid Ceramic Matrix Composites" provides the results of three-point chevron-notched-beam fracture toughness testing and demonstrates a significant improvement in transverse fracture toughness can be obtained through the use of hybrid fiber reinforcements. The second paper, "A Tensile Testing Method for Ceramic Matrix Composites" presents a novel approach to testing small brittle material specimens using conventional testing equipment with minimal specialized fixture components. The third paper, "Fiber/Matrix Interface Properties of Hybrid Ceramic Matrix Composites", presents a method of determining the characteristics of the fiber/matrix interface of a continuous fiber reinforced CMC and a related hybrid CMC reinforced by both continuous fibers and finely dispersed whiskers using a multiple fiber pullout technique"--Abstract, page iv.

Advisor(s)

Dharani, Lokeswarappa R.

Committee Member(s)

Carroll, Douglas R.
Stutts, Daniel S.
Riggins, David W.
Lehnhoff, T. F., 1939-

Department(s)

Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Aerospace Engineering

Comments

These projects were funded in part by the U. S. Air Force Office of Scientific Research (Grants #F49620-93-10223 and #F49620-95-1-0436). The Manufacturing Research and Training Center (Missouri Department of Economic Development) provided a matching grant to supplement the AFOSR funding. The University of Missouri Research Board provided the seed grant used to conduct feasibility studies.

Publisher

University of Missouri--Rolla

Publication Date

Fall 2002

Journal article titles appearing in thesis/dissertation

  • Transverse Fracture Toughness of Unidirectional Continuous Fiber and Hybrid Ceramic Matrix Composites
  • A Tensile Test Method for Ceramic Matrix Composites
  • Fiber/Matrix Interface Properties of Ceramic Matrix Composites

Pagination

x, 64 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2002 Stephen Berry Haug, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Ceramic-matrix composites

Thesis Number

T 8143

Print OCLC #

52583390

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