Carbon fibre composites find wide applications in the aerospace, sporting goods, and biomedicine industries. Mechanical and thermal properties of such materials are highly anisotropic; adequate experimental measuring methods are therefore requested to determine them.
Electronic Speckle Pattern Interferometry (ESPI) is an optical measuring technique that allows rapid and highly accurate measurement of deformations. In comparison with other techniques for strain measurement or calculation, ESPI enjoys the advantages of being non-contact and full-field, having a high spatial resolution and high sensitivity for delivering accurate displacement data, and not requiring any calibration or costly surface preparation. It can be applied to any material provided that the surface is sufficiently rough and the laser light is diffusely reflected.
Measurement of the CTE for anisotropic materials such as carbon fibre composites using ESPI offers not only a final value but also full-field information about the deformation of the material under thermal stress.
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