An Analysis Of Internal Strains In Unidirectional
And Chopped Graphite Fibre Composites
Based On X-ray Diffraction And Micro Raman
Spectroscopy Measurements
Author(s)
B. Benedikt, M. Lewis & P. Rangaswamy
Abstract
In this paper, the method for the determination of internal strains in polymer
matrix composites from the strain measurements in the embedded sensors has
been examined. Two types of strain sensors embedded in either chopped graphite
fibre/epoxy matrix composite or unidirectional graphite fibre/polyimide matrix
composite were investigated. For the chopped fibre composite, we used Kevlar-
49 fibres (~10µm in diameter) as strain sensors, while aluminium inclusions with
diameters ranging from 1 to 20µm were embedded in the unidirectional
composite. Both composite plates with embedded sensors were subjected to
external loads generated by a four-point bending fixture. Strains inside the
sensors were measured using either x-ray diffraction (XRD) or micro Raman
spectroscopy (MRS). A model based on the equivalent inclusion method (EIM)
was used to extract the internal strains in composites from the measured strains
inside the embedded sensors. It has been demonstrated that the geometrical
features and the material properties of the embedded strain sensors may affect
the accuracy of the extraction of the composite internal strains. The average
interactions between the sensors were found to have only a minor effect on the
strain determination in a composite.
Keywords: x-ray diffraction; micro Raman spectroscopy; equivalent inclusion
method; Eshelby tensor; interactions between inclusions; four-point bending.
Keywords
x-ray diffraction; micro Raman spectroscopy; equivalent inclusion
method; Eshelby tensor; interactions between inclusions; four-point bending.
Related Book
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