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Effect of Thermal Expansion Mismatch on Fiber Pull-out in Glass Matrix Composites

Published online by Cambridge University Press:  22 February 2011

U. V. Deshmukh ,
A. Kanei ,
S. W. Freiman  and
D. C. Cranmer
U. V. Deshmukh
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104
A. Kanei
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104
S. W. Freiman
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104
D. C. Cranmer
Affiliation:
Ceramics Division, National Bureau of Standards, Gaithersburg, MD 20899
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Abstract

Single fiber pull-out tests can be used to directly measure the fiber-matrix interfacial shear stress in glass matrix composites. The system under investigation consisted of a soda-lime-silica glass matrix containing SiC monofilaments with a carbon-rich surface. The presence of the carbon-rich layer on the surface of these fibers makes them non-wetting to most glasses; hence the fibers are held in the matrix only by frictional forces acting at the interface. The mechanical gripping responsible for this force can be changed by manipulating the glass matrix/fiber thermal expansion coefficient mismatch. Frictional stresses (τ) and friction coefficients (μ) obtained for SiC monofilaments in a soda-lime-silica glass matrix were compared with previously obtained data on a borosilicate glass matrix (τ = 2–3 MPa, μ = 0.72 ± 0.36). For the soda-lime-silica system, τ's of 4–20 MPa and μ of 0.10 ± 0.03 were obtained. τ in the soda-lime-silica system is higher due to the larger difference in thermal expansion mismatch between the fiber and matrix. The differences in μ may be due to lubrication effects caused by water at the fiber-matrix interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 253
Copyright
Copyright © Materials Research Society 1988

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