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Carbonfiber reinforced plastic(CFRP)has electrical conductivityboth in parallel and transversedirection offiber.Sincetheelectricalnetwork maybechangedwith applied strain,the electricalconductivityoftheCFRPwouldalsobechangedforthepiezoresistivity.Strainmonitoring of CFRP, therefore, can be performed without any additional sensor but by measuring the electrical resistance change. There has been many studies on the gage factors of unidirectional CFRPs,although significantmutualdifferenceswerefound out in theresults reported.It isconsideredthat thedifferencesmaybecausedbythestrong electricalanisotropyandinhomogenityofthe unidirectionalCFRP.In thisstudy,anewconceptwasintroduced tomeasurethegagefactorsofa unidirectional CFRP precisely.Finite element analysis was utilized to take into considered nonuniform electricalpotentialfield in theunidirectionalCFRP.Thegagefactorswereobtained asa result ofminimizing the error sum of squares of electrical potentials between experimental and analyticalresults.Gagefactorinfiberdirectionwasaffectedbythat in thicknessdirectiondepending on the specimen configuration. FEM analysis showed the possibility that the unidirectional CFRPmayshowboth positiveand negativegagefactor infiberdirection.

FEM-aided Identification of Gage Factors of Unidirectional CFRP by Multipoint Potential Measurement