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Multiscale damage characterization in continuous fiber ceramic matrix composites using digital image correlation

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Abstract

Damage in continuous fiber CMCs with weakly bonded fiber–matrix interfaces evolves in several stages that span multiple length scales. Comprehensive damage characterization necessitates identifying how damage initiates as well as how it accumulates (through final failure), which is not feasible with information gathered from a single length scale. Using digital image correlation to measure full-field surface deformations, damage evolutions in continuous fiber SiC/SiC laminates were analyzed at three distinct length scales: constituent, lamina, and laminate. Constituent scale analyses indicated that fine matrix cracks initiated in localized regions of transverse fiber coatings at low stresses. Investigations at the larger lamina scale revealed that some, but not all, of the coating cracks evolved into matrix cracks, the propagation of which was dependent on the state of stress near the crack tip and the local microstructure. Many of these matrix cracks morphed into cracks large enough to be detected at the (largest) laminate scale. The density of the large matrix cracks increased with load, reaching saturation prior to failure. While the constituent scale identifies when (with respect to stress state) and where (with respect to local microstructure) damage initiates, the lamina scale elucidates damage progression between neighboring constituents. Only laminate scale fields of view are large enough to capture the accumulation of the large matrix cracks that ultimately lead to final fracture. However, as spatial resolution is reduced at this scale, finer cracks (which may provide pathways for environmental ingress) go undetected. As each length scale provides a unique perspective of damage evolution in CMCs, multiscale analysis is essential for comprehensive damage characterization.

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Authors and Affiliations

  1. University of Michigan, 2138 GG Brown, 2350, Hayward Street, Ann Arbor, MI, 48109, USA

    J. Tracy, S. Daly & K. Sevener

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  1. J. Tracy
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  2. S. Daly
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  3. K. Sevener
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Correspondence to S. Daly.

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Tracy, J., Daly, S. & Sevener, K. Multiscale damage characterization in continuous fiber ceramic matrix composites using digital image correlation. J Mater Sci 50, 5286–5299 (2015). https://doi.org/10.1007/s10853-015-9076-z

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  • DOI: https://doi.org/10.1007/s10853-015-9076-z

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