Fracture of aluminum phosphate/alumina matrix silicon carbide fiber reinforced laminated composites
AdvisorBradt, Richard C.
Mining and Metallurgical Engineering
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The fracture of SiC/AliO:,-AlP04 cementitious matrix, 2D woven fabric, laminated composites was investigated from room temperature to 1200 °C. The differences in the mechanical properties were studied in terms of (i) the carbon coating on the fibers and (ii) temperature. A significant result of this thesis was the major effect of the matrix bond phase transition of the Al.P04 on the fracture resistance. A distinct transition of the fracture from toughened-to-embrittled was observed at 600 °C for the three composites. For temperatures below 600 °C, the carbon coating promotes a weak interf acial bonding at the fiber/matrix interface. Consequently, fiber debonding and fiber pull-out contribute to the rising R-curves of the composites. At temperatures above 600 °C, the thermally induced clamping stresses on the fibers are large, while the effect of the carbon coating is insignificant. As a result, the interfacial bonding at the fiber/matrix interface is very strong. The lack of the fiber debonding and fiber pull-out result in a flat R-curves for these composites.
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