Determination of fiber bridging stress profile by debond length measurement Original Research Article

A new technique is developed for measuring the fiber bridging stress in fiber-reinforced ceramic matrix composites (FCMCs). This technique is based on the direct measurement of the debond length associated with a bridged matrix crack in a composite. Theoretical formulations are developed to relate the debond length measurement (DLM) to the applied stress and fiber bridging stress. Subsequently, the DLMs of a bridged crack are used to calculate the bridging stress profile. Simultaneously, the crack opening displacements (CODs) are also measured from which the fiber bridging stress is determined independently. A comparison of the fiber bridging stress obtained from DLM and COD is made. Finally, a new bridging law is proposed and verified based on this study.