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首页> 外文会议>Symposium on Small Specimen Test Techniques: Fourth Volume; Jan 23-25, 2000; Reno, Nevada >Specimen Size Effects on Tensile Properties of 2D/3D SiC/SiC Composites
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Specimen Size Effects on Tensile Properties of 2D/3D SiC/SiC Composites

机译：试样尺寸对2D / 3D SiC / SiC复合材料拉伸性能的影响

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摘要

Miniaturization of tensile specimen is investigated as one of the important methods to evaluate tensile properties of ceramic matrix composites such as SiC/SiC composites, which are attractive materials for fusion applications. For the establishment of small specimen test techniques, specimen size effects on the tensile properties for P/W, S/W and 3-D SiC/SiC composites were investigated. For 3-D composites, whose failure was characteristic in the sequences of statistical fiber fractures, tensile properties were significantly dependent on specimen size. Decreases of tensile strength due to the weakest link concept, the ratio of damage area, and stress concentration due to the local load sharing theory could be observed. For 2-D SiC/SiC composites, dependencies of tensile properties on specimen size were dissimilar to that for 3-D ones and much smaller, because they failed with another failure mode due to the structural restrictions by weaving fiber bundles, and hence this made it difficult to show fiber strength sufficiently.
机译：拉伸试样的小型化是评估陶瓷基复合材料（如SiC / SiC复合材料）的拉伸性能的重要方法之一，SiC / SiC复合材料是融合应用中的诱人材料。为了建立小型样品测试技术，研究了样品尺寸对P / W，S / W和3-D SiC / SiC复合材料拉伸性能的影响。对于3-D复合材料，其破坏是统计纤维断裂序列中的特征，其拉伸性能显着取决于样品尺寸。可以观察到由于最弱的连接概念而导致的抗拉强度降低，损坏区域的比率以及由于局部载荷分担理论而引起的应力集中。对于2-D SiC / SiC复合材料，拉伸性能对样品尺寸的依赖性与3-D样品的依赖性不同，并且要小得多，因为它们由于编织纤维束的结构限制而以另一种失效模式失效，因此这使得难以充分显示出纤维强度。

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