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Damage Progression and Stress Redistribution in Notched SiC/SiC Composites

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Abstract

The stress fields adjacent to machined notch roots were examined during tensile tests of woven SiC/SiC composites using thermoelastic stress analysis. As expected, the stress-concentration factor (SCF) at the notch roots increased with increasing notch lengths. Damage-induced stress-relief was not evident in these composites. In fact, the redistribution of stresses onto isolated fiber tows adjacent to the notch root caused an increase in the apparent SCF. Lastly, the SCF increased with mean stress. This was assumed to occur as a result of opening matrix cracks that are typically closed due to residual compressive stresses in the matrix material at near zero loads.

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Acknowledgments

The authors would like to acknowledge Dr. George Baaklini and Dr. John Lekki of the NASA Glenn Research Center as well as the Integrated Vehicle Health Management Project within the Aviation Safety Program for providing the funding for this study.

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Authors and Affiliations

  1. Ohio Aerospace Institute, NASA GRC, 21000 Brookpark Road MS 6-1, Cleveland, OH, 44135, USA

    Andrew L. Gyekenyesi

  2. The Department of Mechanical Engineering, University of Akron, ASEC, Rm 101, Akron, OH, 44325, USA

    Gregory N. Morscher

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  1. Andrew L. Gyekenyesi
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  2. Gregory N. Morscher
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Correspondence to Andrew L. Gyekenyesi.

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Gyekenyesi, A.L., Morscher, G.N. Damage Progression and Stress Redistribution in Notched SiC/SiC Composites. J. of Materi Eng and Perform 19, 1298–1305 (2010). https://doi.org/10.1007/s11665-010-9622-4

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  • DOI: https://doi.org/10.1007/s11665-010-9622-4

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