Mechanical behavior and numerical estimation of fracture resistance of a SCS6 fiber reinforced reaction bonded S13N4 continuous fiber ceramic composite |
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Authors: | Oh Heon Kwon Michael G Jenkins |
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Affiliation: | (1) Department of Safety Engineering, Pukyong National University, San 100. Yongdang-Dong Nam-Gu, 608-739 Busan, Korea;(2) Department of Mechanical Engineering, University of Washington, 98195 Seattle, WA, USA |
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Abstract: | Continuous fiber ceramic composites (CFCCs) have advantages over monolithic ceramics: Silicon Nitride composites are not well
used for application because of their low fracture toughness and fracture strength, but CFCCs exhibit increased toughness
for damage tolerance, and relatively high stiffness in spite of low specific weight. Thus it is important to characterize
the fracture resistance and properties of new CFCCs materials. Tensile and flexural tests were carried out for mechanical
properties and the fracture resistance behavior of a SCS6 fiber reinforced Si3N4 matrix CFCC was evaluated. The results indicated that CFCC composite exhibit a rising R curve behavior in flexural test.
The fracture toughness was about 4.8 MPa m1/2 , which resulted in a higher value of the fracture toughness because of fiber bridging. Mechanical properties as like the
elastic modulus, proportional limit and the ultimate strength in a flexural test are greater than those in a tensile test.
Also a numerical modeling of failure process was accomplished for a flexural test. This numerical results provided a good
simulation of the cumulative fracture process of the fiber and matrix in CFCCs. |
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Keywords: | Continuous Fiber Ceramic Composite Fracture Toughness Fracture Resistance Behavior Tensile and Flexural Test Mechanical Properties Numerical Modeling Failure Process |
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