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A new remote laser Raman stress/ strain sensor for localised measurements in polymer based composites, has been developed and tested. Measurements can be conducted in reinforcing fibres near the surface of laminates. For measurements in the bulk of composites, the exciting laser light has to be transported to the reinforcing fibres via an embedded fibre optic cable. The backscattered light is transmitted through the same fibre optic and is sent to the Raman spectrometer for analysis. The effect of the direction of the fibre optic cable with respect to the axis of the reinforcing fibres is examined. Finally, the relationships between the local fibre stress or strain obtained from the Raman sensor and the far field stress or strain measured conventionally, are established.

Localised Stress Measurements in Composite Laminates Using a Raman Stress Sensor