Laser Raman Miscoscopy for fibre stress measurements at the microscale
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Laser Raman Microscopy (LRM) is the only experimental technique able to measure stress or strain on individual fibres at the microscopic level. The Raman wavenumbers of certain vibrational modes of crystalline materials – such as carbon, SiC or Kevlar fibres embedded in composites – are stress/strain dependent, most frequently through a simple linear relation that can be established experimentally and constitutes the fibre-specific Raman Calibration Curve (RCC). The RCC of a fibre can be used reversely to translate shifts captured from the same type of fibre in a composite material, to stress/strain.
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