Title page for ETD etd-01292002-133751

Type of Document Dissertation
Author Huang, Xinyu
Author's Email Address xihuang@vt.edu
URN etd-01292002-133751
Title Mechanics and Durability of Fiber Reinforced Porous Ceramic Composites
Degree PhD
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Reifsnider, Kenneth L. Committee Chair
Bates, Robert C. Committee Member
Hasselman, D. P. H. Committee Member
Heller, Robert A. Committee Member
Lesko, John J. Committee Member
  • mechanical properties
  • durability
  • micromechanics
  • ceramic matrix composites
  • porous ceramics
  • hog gas filters
Date of Defense 2001-12-19
Availability unrestricted
Porous ceramics and porous ceramic composites are emerging functional materials

that have found numerous industrial applications, especially in energy conversion

processes. They are characterized by random microstructure and high porosity.

Examples are ceramic candle filters used in coal-fired power plants, gas-fired

infrared burners, anode and cathode materials of solid oxide fuel cells, etc.

In this research, both experimental and theoretical work have been conducted to

characterize and to model the mechanical behavior and durability of this novel

class of functional material. Extensive experiments were performed on a hot gas

candle filter material provided by the McDermott Technologies Inc (MTI). Models at

micro-/meso-/macro- geometric scales were established to model the porous ceramic

material and fiber reinforced porous ceramic material. The effective mechanical

properties are of great technical interest in many applications. Based on the

average field formalism, a computational micromechanics approach was developed to estimate

the effective elastic properties of a highly porous material with random microstructure.

A meso-level analytical model based on the energy principles was developed to estimate

the global elastic properties of the MTI filament-wound ceramic composite tube.

To deal with complex geometry, a finite element scheme was developed for

porous material with strong fiber reinforcements. Some of the model-predicted elastic

properties were compared with experimental values. The long-term performance of ceramic

composite hot gas candle filter materials was discussed. Built upon the stress analysis

models, a coupled damage mechanics and finite element approach was presented to assess

the durability and to predict the service life of the porous ceramic composite

candle filter material.

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