SYMPOSIA PAPER Published: 01 January 2000
STP15014S

The Effects of Microstructural Damage on the Thermal Diffusivity of Continuous Fiber-Reinforced Ceramic Matrix Composites

Source

The relationship between microstructural damage and the thermal diffusivity of unidirectional reinforced Nicalon™-LAS II was investigated. Damage in the form of matrix-microcracking and fiber-matrix debonding was induced in the composites through Monotonic and cyclic mechanical loading. The thermal diffusivity of the composites was measured in directions transverse and parallel to the fiber axis by the standard flash diffusivity method. The results showed that damage induced by mechanical loading only affected the thermal diffusivity parallel to the fiber direction. Mechanical loading followed by oxidation of the carbonaceous interface resulted in significant changes in the longitudinal and transverse thermal diffusivity of the mechanically-damaged samples. These experiments showed the important role of the interfacial conductance on both the longitudinal and transverse thermal Diffusivity. The experimental data, along with finite element calculations, were used to assess the use of micromechanics-based models in predicting an effective thermal conductivity of damaged composites.

Author Information

Graham, S
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA
McDowell, DL
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA
Lara-Curzio, E
Oak Ridge National Laboratory, Oak Ridge, TN
Dinwiddie, RB
Oak Ridge National Laboratory, Oak Ridge, TN
Wang, H
Oak Ridge National Laboratory, Oak Ridge, TN
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Details
Developed by Committee: C28
Pages: 185–200
DOI: 10.1520/STP15014S
ISBN-EB: 978-0-8031-5440-7
ISBN-13: 978-0-8031-2872-9