Acousto-Ultrasonic analysis of failure in ceramic matrix composite tensile specimens
Three types of acousto-ultrasonic (AU) measurements, stress-wave factor (SWF), lowest antisymmetric plate mode group velocity (VS), and lowest symmetric plate mode group velocity (VL), were performed on specimens before and after tensile failure. Three different Nicalon fiber architectures with ceramic matrices were tested. These composites were categorized as 1D (unidirectional fiber orientation) SiC/CAS glass ceramic, and 2D and 3D woven SiC/SiC ceramic matrix materials. SWF was found to be degraded after tensile failure in all three material categories. VS was found to be degraded only in the 1D SiC/CAS. VL was difficult to determine on the irregular specimen surfaces but appeared unchanged on all failed specimens. 3D woven specimens with heat-treatment at high temperature exhibited degradation only in SWF.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 6253446
- Report Number(s):
- N-93-29073; NASA-TM-106219; E-7930; NAS-1.15:106219; CONF-9306230-; CNN: RTOP 510-01-50
- Resource Relation:
- Conference: 2. international conference on acousto-ultrasonics, Atlanta, GA (United States), 24-25 Jun 1993
- Country of Publication:
- United States
- Language:
- English
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