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Direct measurement of fiber bridging in notched glass-ceramic-matrix composites

Published online by Cambridge University Press:  01 May 2006

Konstantinos G. Dassios  and
Costas Galiotis
Konstantinos G. Dassios*
Affiliation:
University of Patras, Department of Materials Science, Rio University Campus, GR-26504, Greece; and Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, Mechanics of Materials Laboratory, Platani, Platani Patras GR-26504, Greece
Costas Galiotis
Affiliation:
University of Patras, Department of Materials Science, Rio University Campus, GR-26504, Greece; and Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, Mechanics of Materials Laboratory, Platani, Platani Patras GR-26504, Greece
*
a) Address all correspondence to this author. e-mail: kdassios@upatras.gr
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Abstract

A novel, high-resolution remote Raman microscope was used for the direct in situ assessment of deformation on bridging fibers in a double-edge-notched SiC-Nicalon reinforced ceramic-glass matrix composite at various stages of monotonic tensile loading. The effect of notch length on the bridging strain profiles obtained by individually probing a large number of fibers across the bridged ligament of the composite was investigated. Bridging strain measurements in the microscale are used to identify the role and sequence of the failure micromechanisms developing within the bridging zone and are compared with their macromechanically derived counterparts. The difference of 25% in failure strain between the as-received fiber and the maximum value obtained on composite-fibers through laser Raman microscopy (LRM), is attributed to the different patterns of fiber failure in composites as compared to the techniques used for fibers characterization such as monofilament and bundle testing in air. This article demonstrates how the LRM-strain data can be utilized to obtain a direct, microscale measure of the interfacial-shear strength of the composite. The obtained interfacial shear strength (ISS) value of 7 MPa compares well with the macromechanically predicted value and offers a much higher precision compared to other experimental techniques.

Keywords

CompositeFractureRaman spectroscopy
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1150 - 1160
Copyright
Copyright © Materials Research Society 2006

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