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Kubicka, Marcus
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article
Magnetostrictive properties of epoxy resins modified with Terfenol-D particles for detection of internal stress in CFRP. Part 2: evaluation of stress detection
Abstract
The mechanical performance of carbon fibrereinforced polymers is predominantly limited by internalstress induced by resin shrinkage of the polymer matrix.Terfenol-D particles are investigated as internal sensors todetect the stress situation on a non-destructive way. Part 1 ofthe article describes the preparation and characterization ofthe samples used in the investigation of the sensory effect(Kubicka et al. J Mater Sci 47:5752–5759, 2012). Part 2presents the results of the evaluation of the stress detection.Afundamental discussion is given how these magnetostrictiveparticles act as stress sensors in epoxy resins using the Villarieffect. Analysing this effect in terms of particle content,particle size and particle distribution the most promisingparameters are identified. Obviously the higher the particlecontent (20 wt%) and the smaller the particle size ( lm)combined with a strong homogeneous particle distributionthe higher the magnetic flux density changes, in case oftensile loads. These corresponding stress situations arequantified by a Hall probe. Interestingly, the magnetic fluxdensity changes (DB) can be significantly increased by a premagnetizationstep of the samples, allowing a more sensitivedetection of the Villari effect.