Piezoresistivity and crosstalk in carbon fiber reinforced cement
Chan, Wai Kit Ricky
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The piezoresistivity-based self-sensing of strain and damage in carbon fiber reinforced cement under two-dimensional loading was demonstrated. The resistance of the top (compression) or bottom (tension) surface is measured along the radius of the circular support used in two-dimensional flexure. The top surface resistance decreases while the bottom surface resistance increases reversibly as deflection occurs, due to compressive and tensile strains at the top and bottom surfaces respectively. The resistance at the peak deflection is an indicator of the strain amplitude, while the resistance after unloading is an indicator of the damage. This thesis provides the first observation of crosstalk between successively measured channels of resistance measurement in carbon fiber reinforced cement. It is attributed to electric polarization of one channel affecting that of a neighboring channel. It results in correlated variation of the measured resistance of the two channels. The correlation can be in phase or out of phase.