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Shear Failure Behavior of Continuous Fiber Reinforced Ceramic Matrix Composites

机译：连续纤维增强陶瓷基复合材料的剪切破坏行为

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摘要

Shear strengths of unidirectional reinforced CMCs (Si-Ti-C-O fiber bonded ceramic and C/C) were measured using various methods (DNC, IP and SB method). In-situ simultaneous observations of the failure behavior were carried out using a high-speed video camera. Initial failure point of the specimens in IP method was a V-notch tip, and shear strength obtained by this method was lowest among them in both materials. On the other hand, shear strength obtained by DNC method was higher. FEM analyses revealed that these phenomena were due to interference of normal stress: superimposed normal stresses at gage section scarcely existed in DNC specimens, but highly existed in IP specimens. In addition, it is clear that the rate of shear crack propagation was more than 480m/s in DNC method.
机译：使用各种方法（DNC，IP和SB方法）测量了单向增强型CMC（Si-Ti-C-O纤维粘结陶瓷和C / C）的剪切强度。使用高速摄像机对故障行为进行现场同步观察。 IP方法的样品初始破坏点为V形缺口尖端，在两种材料中，通过该方法获得的剪切强度最低。另一方面，通过DNC法得到的剪切强度较高。有限元分析表明，这些现象是由于正应力的干扰所致：DNC标本几乎不存在标距截面的叠加正应力，而IP标本中高度存在。另外，很明显，在DNC方法中，剪切裂纹的扩展速率大于480m / s。

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  • 来源
  • 会议地点 Osaka(JP);Osaka(JP);Osaka(JP);Osaka(JP)
  • 作者

    Y. Ishiguro; T. Akatsu; Y. Tanabe; E. Yasuda;

  • 作者单位

    Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan;

    Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan;

    Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan;

    Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.58;
  • 关键词

    shear strength; testing method; finite element analysis; in-situ observation;

    机译：剪切强度测试方法有限元分析;原位观察;

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