SYMPOSIA PAPER Published: 01 January 1990

Comparison of Methods for Determining Fiber/Matrix Interface Frictional Stresses in Ceramic Matrix Composites


In this study, several experimental methods including indentation push-in, in dentation push-out, and single-fiber pull-out tests were employed to measure the strength of the fiber/matrix bond in two continuous fiber reinforced ceramic matrix composites. The composite systems examined were a silicon carbide (SiC) monofilament reinforced borosilicate glass matrix and a SiC fiber tow reinforced glass-ceramic matrix Single-fiber pull out test results gave debond strengths (τd) of 11.1 ±3.2 MPa and interface frictional stresses (τf) of 3.6 ± 0.7 MPa for the SiC/borosihcate system. In the push out test, τd for the SiC/borosihcate system appears to be about 10 MPa while ts between 1 and 55 MPa were obtained in the SiC/glass-ceramic composite. The push-in test gave values of τf, between 2 and 34 MPa for the SiC/glass-ceramic system. Variability in τ within a specimen is due to differences in bonding between the fibers and matrix at various locations. The discrepancies in τ both within a test and between test methods are explained in terms of fiber/matrix bonding and test geometry. The most versatile test method appears to be the indentation push-out test.

Author Information

Cranmer, DC
National Institute of Standards and Technology, Gaithersburg, MD
Deshmukh, UV
Drexel University, Philadelphia, PA
Coyle, TW
Ecole Nationale Supeneure de Mechamque, Nantes, France
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Developed by Committee: D30
Pages: 124–135
DOI: 10.1520/STP25396S
ISBN-EB: 978-0-8031-5138-3
ISBN-13: 978-0-8031-1385-5