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Temperature Dependence of Electrical Resistance of Woven Melt-Infiltrated SiCf/SiC Ceramic Matrix CompositesRecent studies have successfully shown the use of electrical resistance (ER)measurements to monitor room temperature damage accumulation in SiC fiber reinforced SiC matrix composites (SiCf/SiC) Ceramic Matrix Composites (CMCs). In order to determine the feasibility of resistance monitoring at elevated temperatures, the present work investigates the temperature dependent electrical response of various MI (Melt Infiltrated)-CVI (Chemical Vapor Infiltrated) SiC/SiC composites containing Hi-Nicalon Type S, Tyranno ZMI and SA reinforcing fibers. Test were conducted using a commercially available isothermal testing apparatus as well as a novel, laser-based heating approach developed to more accurately simulate thermomechanical testing of CMCs. Secondly, a post-test inspection technique is demonstrated to show the effect of high-temperature exposure on electrical properties. Analysis was performed to determine the respective contribution of the fiber and matrix to the overall composite conductivity at elevated temperatures. It was concluded that because the silicon-rich matrix material dominates the electrical response at high temperature, ER monitoring would continue to be a feasible method for monitoring stress dependent matrix cracking of melt-infiltrated SiC/SiC composites under high temperature mechanical testing conditions. Finally, the effect of thermal gradients generated during localized heating of tensile coupons on overall electrical response of the composite is determined.
Document ID
20160007350
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Appleby, Matthew P. (NASA Glenn Research Center Cleveland, OH United States)
Morscher, Gregory N. (Akron Univ. Akron, OH, United States)
Zhu, Dongming (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
June 8, 2016
Publication Date
May 1, 2016
Subject Category
Composite Materials
Electronics And Electrical Engineering
Report/Patent Number
GRC-E-DAA-TN30642
NASA/TM-2016-219095
E-19224
Funding Number(s)
WBS: WBS 109492.02.03.02.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Ceramic Matrix Composites
Electrical Resistance
Laser thermal gradient effects

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