Abstract
A review is presented of the application of analytical optical microscopy to the analysis of composite micromechanics in a number of different composites systems. A description is given of the use of Raman spectroscopy to follow fibre deformation in a variety of different aramid/epoxy composite test‐pieces. Various examples are presented including the single‐fibre pull‐out test, crack bridging with an array of fibres, stress concentrations around a hole in a unidirectional composite and a high‐volume fraction woven composite. In each case it is shown that the Raman technique gives a unique opportunity to measure local fibre strain leading to the possibility of analysing fully the deformation micromechanics. In addition it is shown how, for alumina‐based fibres such as PRD‐166, well‐defined fluorescence spectra can be obtained and that the stress‐induced fluorescence band shifts allow deformation micromechanics to be studied for PRD‐166 fibres in a glass matrix. In particular it is shown how it is possible to determine the level of thermal residual strain and follow the effect of externally imposed deformation upon the level of residual strain.
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