Abstract
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 Δv = v0 + 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.
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