Mechanical Properties of SiC-SiC Composites

   TPUC

  Diffraction User Center
  Residual Stress User Center
  Diff. and Therm. Prop. Group
  High Temperature Materials Laboratory
  Metals and Ceramics Division
  Oak Ridge National Laboratory

IR Camera Captured Temperature Change of SiC-SiC Composites During Tensile Tests

 TPUC worked with UTK Materials Science Department on mechanical properties of SiC-SiC composites.  An infrared camera was used to monitor temperature change during tensile testing. As shown in the picture below, a localized temperature rise of 5-10°C was found at the moment of failure. No change was observed as close as 10 ms before the failure. This indicates that the failure in SiC-SiC composites are brittle fracture in nature. Sliding of fibers and fiber pull-out were observed during the failure.  Stress-strain curves and acoustic emission were also recorded during the tensile tests. The acoustic emission results are being analyzed in order to correlate the temperature changes captured by the infrared camera.


Infrared image showing the final failure of a SiC-SiC composite specimen
  		 



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Acknowledgments
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