Impedance-based Structural Health Monitoring of a Ceramic Matrix Composite

摘要

This article addresses the use of electro-mechanical impedance-based structural health monitoring for assessing damage in a woven ceramic matrix composite consisting of a silicon carbide fibers and silicon carbide matrix. Controlled levels of damage were induced by conducting quasi-static, load/unload/reload tensile tests. The specimen's localized mechanical impedance was assessed using piezoelectric-ceramic patches that act as both actuator and sensor. The impedance results were correlated to damage and compared to acoustic emissions data, stress-strain response, and data from previous studies concerning the material system. The impedance data was shown to correlate well with the progressive damage mechanisms within the composite material system.