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

University Of Cincinnati Main Campus, Cincinnati OH

Investigators

Abstract

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.