Raman extensometry study of NLM202® and Hi-nicalon® SiC fibres

Strain calibration of NLM202® and Hi-Nicalon® fibres was performed for increasing applied strains (ε) by plotting the Raman wavenumbers ( v) of two carbon peaks located around 1340 and 1600 cm −1 . Measurements concerned as-received fibres—for which importance of desizing was noticeable—and fibres a...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 1998, Vol.29 (3), p.251-261
Main Authors: Gouadec, G., Karlin, S., Colomban, Ph
Format: Article
Language:English
Subjects:
A. ceramic fibre
Applied sciences
B. elasticity
B. mechanical properties
Building materials. Ceramics. Glasses
Ceramic and carbon fibers
Ceramic industries
Chemical industry and chemicals
Chemical Sciences
D. non-destructive testing
Exact sciences and technology
Physics
Technical ceramics
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Summary:Strain calibration of NLM202® and Hi-Nicalon® fibres was performed for increasing applied strains (ε) by plotting the Raman wavenumbers ( v) of two carbon peaks located around 1340 and 1600 cm −1 . Measurements concerned as-received fibres—for which importance of desizing was noticeable—and fibres annealed in a reducing atmosphere to simulate the elaboration of the silicon carbide fibre composite's usual reinforcement. Measurement of experimental Δ v = v 0 + Sε law produced — 3 cm −1/strain% typical values of S wavenumber shift slope. Any heating induced at the fibre's surface by the laser beam provokes an additional shift in the temperature of the materials. Work conditions exist, however, that allow full dissipation of the energetic flow and rule out this shortcoming. In situ assessment of residual stresses for a Hi-Nicalon® fibre embedded in a mullite matrix was eventually attempted.
ISSN:1359-8368
1879-1069
DOI:10.1016/S1359-8368(97)00027-9