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首页> 外文期刊>Ceramic Engineering and Science Proceedings >FRACTURE RESISTANCE OF SILICON CARBIDE COMPOSITES USING VARIOUS NOTCHED SPECIMENS
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FRACTURE RESISTANCE OF SILICON CARBIDE COMPOSITES USING VARIOUS NOTCHED SPECIMENS

机译：使用各种缺口试样的碳化硅复合材料的抗断裂性能

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摘要

One of key issues for the practical application of SiC/SiC composite, a promising candidate of functional and/or structural components for various energy industries, is to develop design basis of quasi-ductile composites. Understanding the crack propagation behavior of this class of composites is, therefore, essential. For this purpose, determining a fracture resistance of composites is undoubtedly important and this paper aims to evaluate this using various notched specimens: the single-edge notched-bend (SENB) specimen and the double notch tensile (DNT) specimen. With the preliminary analysis by the authors, a new methodology to determine the fracture resistance has been developed based on the non-linear fracture mechanics, separately discussing the effect of irreversible energies. By adopting this method to the SENB test results for nano-infiltration transient-eutectic-phase sintered (NITE) SiC/SiC composites, several key findings were obtained: (1) notch insensitivity, (2) no significant size effect, and (3) superior crack tolerance. Similarly, the notch insensitivity was also identified for the DNT test results, depending on the fiber/matrix interfacial bonding strength.
机译：SiC / SiC复合材料的实际应用的关键问题之一是开发准延性复合材料的设计基础，SiC / SiC复合材料是各种能源行业中功能和/或结构组件的有希望的候选者。因此，了解此类复合材料的裂纹扩展行为至关重要。为此，毫无疑问，确定复合材料的断裂强度很重要，本文旨在使用各种带缺口的样品（单边带缺口弯曲（SENB）样品和双带缺口拉伸（DNT）样品）对此进行评估。经过作者的初步分析，基于非线性断裂力学，开发了一种确定断裂阻力的新方法，并分别讨论了不可逆能量的影响。通过将该方法用于纳米渗透瞬态共晶烧结（NITE）SiC / SiC复合材料的SENB测试结果，获得了以下关键发现：（1）缺口不敏感;（2）没有明显的尺寸效应;以及（3） ）优异的抗裂性。同样，对于DNT测试结果，还确定了缺口不敏感度，具体取决于纤维/基质界面粘合强度。

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