Identication of the interfacial fracture energy at high temperature of an environmental barrier coating on a ceramic matrix composite

In the present work, the interface fracture energy between a SiC/SiC ceramic matrix composite and its environmental barrier coating is assessed at 1000°C. Four-point flexural tests with no precrack were conducted inside a furnace to propagate stable cracks at the interface. The associated instrumentation by visible light camera allowed for the analysis of the tests thanks to digital image correlation. It is reported that kinematic field measurements are perturbed by heat haze eects, which were mitigated via spatiotemporal regularization. The measured displacement fields were then utilized for crack tip position identication and interface fracture energy quantification. The results are compared to those observed at room temperature.