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Electrical Resistance of SiC/SiC Ceramic Matrix Composites for Damage Detection and Life-PredictionCeramic matrix composites (CMC) are suitable for high temperature structural applications such as turbine airfoils and hypersonic thermal protection systems due to their low density high thermal conductivity. The employment of these materials in such applications is limited by the ability to accurately monitor and predict damage evolution. Current nondestructive methods such as ultrasound, x-ray, and thermal imaging are limited in their ability to quantify small scale, transverse, in-plane, matrix cracks developed over long-time creep and fatigue conditions. CMC is a multifunctional material in which the damage is coupled with the material s electrical resistance, providing the possibility of real-time information about the damage state through monitoring of resistance. Here, resistance measurement of SiC/SiC composites under mechanical load at both room temperature monotonic and high temperature creep conditions, coupled with a modal acoustic emission technique, can relate the effects of temperature, strain, matrix cracks, fiber breaks, and oxidation to the change in electrical resistance. A multiscale model can in turn be developed for life prediction of in-service composites, based on electrical resistance methods. Results of tensile mechanical testing of SiC/SiC composites at room and high temperatures will be discussed. Data relating electrical resistivity to composite constituent content, fiber architecture, temperature, matrix crack formation, and oxidation will be explained, along with progress in modeling such properties.
Document ID
20130013151
Acquisition Source
Glenn Research Center
Document Type
Presentation
Authors
Smith, Craig (Akron Univ. Akron, OH, United States)
Morscher, Gregory (Ohio Aerospace Inst. Cleveland, OH, United States)
Xia, Zhenhai (Akron Univ. Akron, OH, United States)
Date Acquired
August 27, 2013
Publication Date
January 22, 2009
Subject Category
Composite Materials
Report/Patent Number
E-17376
E-17375
Meeting Information
Meeting: 33rd International Conference on Advanced Ceramics and Composites
Location: Daytona Beach, FL
Country: United States
Start Date: January 18, 2009
End Date: January 23, 2009
Sponsors: American Ceramic Society
Funding Number(s)
WBS: WBS 599489.02.07.03.02.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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