A Novel Approach for Measuring Crack Bridging Fiber Stress Profile in a Hybrid Fiber Reinforced Ceramic Composites

测量混合纤维增强陶瓷复合材料中裂纹桥接纤维应力分布的新方法

• 批准号: 0070213
• 负责人: Raj Singh
• 金额: $ 24万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070213&HistoricalAwards=false
• 关键词: Novel; Approach; Measuring; Crack; Bridging

The primary objective of the proposed research is to measure crack bridging fiber stress profile directly in a transparent fiber reinforced ceramic matrix composite (FRCMC) using a new technique of Debond Length Measurement (DLM) in conjunction with the optical fluorescence spectroscopy as a fingerprint for local state of stress. This objective is being accomplished by fabricating transparent and hybrid FRCMCs comprising of a glass matrix reinforced with reinforcing continuous SiC fibers and sensor sapphire fibers, performing in situ crack propagation studies using an optical microscopy, measuring crack bridging fiber stresses in situ using a new approach of DLM and fluorescence spectroscopy, and incorporating these results into analytical models to describe fracture resistance behavior of FRCMCs.

建议的研究的主要目的是测量裂纹桥接纤维应力分布直接在透明的纤维增强陶瓷基复合材料（FRCMC）使用一种新的技术的脱粘长度测量（DLM）结合光学荧光光谱作为指纹的局部应力状态。这一目标是通过制造透明的和混合FRCMC，包括增强连续SiC纤维和传感器蓝宝石纤维增强的玻璃基体，进行原位裂纹扩展研究，使用光学显微镜，测量裂纹桥接纤维应力原位使用DLM和荧光光谱的新方法，并将这些结果纳入分析模型，以描述FRCMC的抗断裂性能。