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Material Health Monitoring of SIC/SIC Laminated Ceramic Matrix Composites With Acoustic Emission And Electrical Resistance
Gordon, Neal A

2014, Master of Science in Engineering, University of Akron, Mechanical Engineering.
Ceramic matrix composites (CMC) composed of Hi-Nicalon Type S™ fibers, a boron-nitride (BN)
interphase, and pre-impregnated (pre-preg) melt-infiltrated silicon / silicon-carbide (SiC) matrix have been
studied at room-temperature consisting of unidirectional and cross-ply laminates. Quasi-static, hysteretic
and uniaxial tensile tests were done in conjunction with a variety of temporary, laboratory-based material
health-monitoring techniques such as electrical resistance (ER) and acoustic emission (AE). The mechanical
stress-strain relationship paired with electrical and acoustic measurements were analyzed to expand upon
current composite knowledge to develop a more fundamental understanding of the failure of brittle matrix
laminates, their constituents, and interactions. In addition, a simple but effective method was developed to
allow visual confirmation of post-test crack spacing via microscopy. To enhance fidelity of acquired data,
some specimens were heat-treated (i.e. annealing) in order to alter the residual stress state. Differences in
location, acoustic frequency, and magnitude of matrix cracking for different lay-ups have been quantified
for unidirectional and [0/90] type architectures. Empirical results shows complex hysteretic mechanical and
electrical behavior due to fiber debonding and frictional sliding of which no general model exists to capture
the essence of this CMC system. The results of this work may be used in material research and
development, stress analysis and design verification, manufacturing quality control, and in-situ system and
component monitoring.
Gregory Morscher, Dr. (Advisor)
Wieslaw Binienda, Dr. (Committee Member)
Tirumalai Srivatsan, Dr. (Committee Member)
112 p.

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Gordon, N. (2014). Material Health Monitoring of SIC/SIC Laminated Ceramic Matrix Composites With Acoustic Emission And Electrical Resistance. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Gordon, Neal. "Material Health Monitoring of SIC/SIC Laminated Ceramic Matrix Composites With Acoustic Emission And Electrical Resistance." Electronic Thesis or Dissertation. University of Akron, 2014. OhioLINK Electronic Theses and Dissertations Center. 15 Dec 2017.

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Gordon, Neal "Material Health Monitoring of SIC/SIC Laminated Ceramic Matrix Composites With Acoustic Emission And Electrical Resistance." Electronic Thesis or Dissertation. University of Akron, 2014. https://etd.ohiolink.edu/

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