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Architectural Effects on Impact Resistance of Uncoated MI SiC/SiC CompositesImpact tests were conducted on uncoated 2D and 2.5D MI SiC/SiC composite specimens at room temperature and 1316 C in air. The specimens were analyzed before and after impact using optical microscopy, pulsed thermography (PT) and computed tomography (CT). Preliminary results indicate the following. Both 2-D and 2.5D composites show increase in surface and volumetric damages with increasing impact velocity. However, 2-D composites are prone to delamination cracks. In both 2D and 2.5D composites, the magnitude of impact damage at a fixed impact velocity is slightly greater at room temperature than at 1315 C. At a fixed projectile velocity and test temperature, the depth of penetration of the projectile into the substrate is significantly lower in 2.5D composites than in 2D composites. Fiber architecture plays a significant role controlling impact damage in MI SiC/SiC composites.
Document ID
20120016775
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Bhatt, R. T. (NASA Glenn Research Center Cleveland, OH, United States)
Cosgriff, L. M. (NASA Glenn Research Center Cleveland, OH, United States)
Fox, D. S. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 26, 2013
Publication Date
May 31, 2009
Subject Category
Composite Materials
Meeting Information
Meeting: 8th PACRIM Conference
Location: Vancouver
Country: Canada
Start Date: May 31, 2009
End Date: June 4, 2009
Sponsors: American Ceramic Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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