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首页> 外文会议>International Conference on Advanced Ceramics and Composites >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：碳化硅复合材料使用各种缺口标本的断裂抗性

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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复合材料实际应用的关键问题之一，各种能源行业的功能和/或结构部件的有希望的候选者，是开发准延性复合材料的设计基础。因此，了解这类复合材料的裂缝传播行为是必不可少的。为此目的，确定复合材料的断裂抗性无疑是重要的，本文旨在使用各种缺口标本评估这一点：单边缘切口弯曲（SENB）样本和双凹口拉伸（DNT）样本。随着作者的初步分析，基于非线性骨折力学开发了一种确定裂缝抗性的新方法，分别讨论了不可逆能量的影响。通过采用该方法对纳米渗透瞬态 - 共晶相烧结（NITE）SiC / SiC复合材料的结果，获得了几个关键结果：（1）缺口不敏感性，（2）没有显着尺寸效应，（ 3）卓越的裂缝耐受性。类似地，根据纤维/基质界面粘合强度，还鉴定了DNT测试结果的凹口内敏感性。

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