Title page for ETD etd-06062008-154429
|Type of Document
||Fatigue behavior of ceramic matrix composites at elevated temperatures under cyclic loading
|Reifsnider, Kenneth L.
|Duke, John C. Jr.
|Johnson, Eric R.
|Kriz, Ronald D.
|Mook, Dean T.
- life prediction
- ceramic matrix composites
- elevated temperature
- strength prediction
- remaining strength
|Date of Defense
To achieve satisfactory levels of strength, fracture toughness, and
reliability for man-rated systems such as jet engines, fiber reinforced ceramic
matrix composites are needed. An elevated temperature axial testing system
is developed to investigate and characterize fatigue behavior of Nicalon fiber
reinforced enhanced silicon carbide matrix. composites at 1800 of under fullyreversed
cyclic loading. Notch effect on quasi-static tensile response is also
considered. Quasi-static and fatigue damage mechanisms and failure modes
are examined using various specimen geometries, load levels, fatigue ratios,
and laminates stacking sequences by employing a number of NDE
techniques. Issues such as damage tolerance and durability are addressed by
conducting interrupted fatigue tests at various stages of life for different load
levels. Results are compared to the predictions of remaining strength and life,
obtained using a performance simulation code. Initial results indicate
existence of a threshold stress value which limits the use of the material
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