Damage evolution in hybrid ceramic matrix composites


An experimental characterization was conducted of the damage evolution in whisker reinforced, fiber reinforced, and hybrid ceramic matrix composites. Highly polished specimens were loaded in increments of 10 MPa, and with each increment were carefully examined with a microscope. Acoustic emission was used to detect the onset of microcracking and it was possible to show the microcracking damage in the composite associated with the acoustic emissions event. As the load was increased, the average distance between microcracks decreased, making more microcracks per mm along the length of the specimen. The fiber reinforced and hybrid samples showed considerable toughness beyond the microcracking stress level. The purpose of this paper is to show how the damage evolves as a function of the applied load and the acoustic emission events.

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Ceramic Engineering and Science Proceedings