Characterizing environment‐dependent fracture mechanisms of ceramic matrix composites via digital image correlation

Bumgardner, Clifton H.; Heim, Frederick M.; Roache, David C.; Price, Morgan C.; Deck, Christian P.; Li, Xiaodong

doi:10.1111/jace.17961

Title: Characterizing environment‐dependent fracture mechanisms of ceramic matrix composites via digital image correlation

Journal Article · 06 July 2021 · Journal of the American Ceramic Society

DOI: https://doi.org/10.1111/jace.17961 · OSTI ID:1806228

^[1];

^[1]; Roache, David C. ^[1]; Price, Morgan C. ^[1]; Deck, Christian P. ^[2]; Li, Xiaodong ^[1]

Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA USA
General Atomics San Diego CA USA

Abstract Here, we unveil a methodology for a novel assessment of the fracture mechanics of SiC/SiC ceramic matrix composites enabled by in situ stereoscopic digital image correlation to quantify in‐process flexural strain and crack opening displacement measurements. This technique isolates individual cracks on the composite surface as discontinuities in the spatial displacement field and correlates key fracture characteristics with the flexural strain of composite specimens during coupled four‐point bend / hermeticity testing. Fracture was observed along the specimen length, originating at the tensile underside and propagating around the circumference of the tubular specimens with generally uniform spacing. Multiple specimens were also tested after heat treatments to 1200°C in open air, in vacuum, and in helium for 48 h to evaluate the environmental effects on the fracture mechanisms of SiC/SiC composites, which revealed degradation of flexural properties after treatment in open air resulting in brittle failure. Indentation‐based fracture toughness measurements were performed, which confirmed a 25% reduction in toughness after open air heat treatment relative to the other heat treatments. This assessment indicated that significant oxidation may occur within the composites from these heat treatments and suggested that further protection of the composites may be necessary for high‐temperature applications.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NE0008706

OSTI ID:: 1806228

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 104; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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