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首页> 美国政府科技报告 >Influence of fiber lay-up sequence on mechanical properties of SiC(f)/SiC composites
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Influence of fiber lay-up sequence on mechanical properties of SiC(f)/SiC composites

机译：纤维叠层顺序对siC（f）/ siC复合材料力学性能的影响

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Mechanical properties of Nicalon-fiber-reinforced silicon carbide matrix composites with two different fiber lay-up sequences (0(degree)/40(degree)/60(degree) and 0(degree)/45(degree)) were evaluated at various temperatures ranging from ambient to 1300(degree)C. Composites with 0(degree)/40(degree)/60(degree) fiber lay-up sequence showed a higher average first matrix cracking stress than that of 0(degree)/45(degree) composites. The measured room-temperature ultimate strength of the 0(degree)/40(degree)/60(degree) composites was 300 MPa compared to 180 MPa for the 0(degree)/45(degree) composites. These measured ultimate strengths were correlated to the predictions made with an analytical model and to in-situ fiber strength characteristics. The large difference in room-temperature ultimate strengths between the two sets of composites is attributed to the relative contributions of the off-axis fibers to the load-bearing capacity of each composite. Up to 1200(degree)C, ultimate strength and work-of-fracture in each set of composites increased, but then declined above 1300(degree)C. The decreases were correlated to in-situ Nicalon fiber strength and fiber/matrix interface degradation.

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