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Nondestructive Characterization of Woven Fabric Ceramic Composites

Published online by Cambridge University Press:  15 February 2011

D. K. Hsu
Affiliation:
Iowa State University, Ames, IA 50011
P. K. Liaw
Affiliation:
University of Tennessee, Knoxville, TN 37996
N. Yu
Affiliation:
University of Tennessee, Knoxville, TN 37996
V. Saini
Affiliation:
Iowa State University, Ames, IA 50011
N. Miriyala
Affiliation:
University of Tennessee, Knoxville, TN 37996
L. L. Snead
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. A. Lowden
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
C. J. Mchargue
Affiliation:
University of Tennessee, Knoxville, TN 37996
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Abstract

Woven fabric ceramic composites fabricated by the chemical vapor infiltration method are susceptible to high void content and inhomogeneity. The condition of such materials may be characterized nondestructively with ultrasonic methods. In this work, longitudinal and shear waves were used in the quantitative determination of elastic constants of NicalonTM/SiC composites as a function of volume percent of porosity. Elastic stiffness constants were obtained for both the inplane and out-of-plane directions with respect to fiber fabric. The effect of porosity on the modulus of woven fabric composites was also modelled and compared to the measured results. Scan images based on the amplitude and time-of-flight of radio frequency (RF) ultrasonic pulses were used for evaluating the material homogeneity for the purpose of optimizing the manufacturing process and for correlation with the mechanical testing results.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

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6. Liaw, P. K., Hsu, D. K., Yu, Y., Miriyala, N., Saini, V., and Jeong, H., TMS Symposium on “High Performance Composites”, Chawla, K. K., Liaw, P. K. and Fishman, S. G., eds., Warrendale, PA., pp. 377395.Google Scholar
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