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 Keywords
- mechanical properties
- durability
- micromechanics
- ceramic matrix composites
- porous ceramics
- hog gas filters
Date of Defense 2001-12-19 Availability unrestricted Abstract Porous ceramics and porous ceramic composites are emerging functional materialsthat 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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