ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Two test methods for determining the tensile (normal) interface bond strength in brittle-matrix composites have been described: one geometry is the cruciform bend specimen, and the other is the embedded fiber specimen. Both specimens have the characteristic that free edge debonding is avoided, so that valid interface strength data can be obtained from the knee in the stress-strain curve. The techniques are applied to a Sigma SiC/7040 glass composite, and a bond strength of ∼5 MPa has been obtained. The method of analysis is described. Normal interface separation has been observed at or very close to the SiC/carbon (primarily graphite) interface of the Sigma fiber and is consistent with the weak orientation of the graphitic layers. Two examples of interface separation are cited in the as-fabricated composite, to show the application and validation of the test results. In one instance, tensile interface separation has been observed next to existing voids, and in the other instance, interface separation has occurred near radial matrix cracks. Analyses show that the debonds are consistent with the low normal strength of the interface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1998.tb02522.x
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