Effects of fiber dosage, loading orientation and stress on frequency response of enhanced Carbon Nano-Fiber Aggregates

Nanomaterial additives have been broadly used in cement and concrete-based sensors to measure the stress strain structure. Most of studies focused on measuring resistivity with Direct Current (DC) or relatively low-frequency. In this work, impedance responses enhanced Carbon Nano-Fiber Aggregates (CNFAs) at different frequencies are rigorously studied utilized as a tool for real-time structural health monitoring (SHM). The CNFA measurements measurement provide an extra dimension (frequency dimension) allow characterization phenomena multimodal simultaneously. First, comprehensive physical model is established understand frequency impedance. Second, COMSOL Multiphysics simulate impedance, which provides more insights into electric field current density distribution. CNFAs decreased increased dosage carbon nanofibers (CNFs). Third, experimental reported detail. electrical variation (EZV) parallel orientation 151% higher than that perpendicular 2612 Hz uniaxial compression 4.65 MPa. strain-EZV curve obtained from response spectrum linear ranging 98 463.9 kHz. 5625 has fit gauge factor 147.78. At 1000 Hz, exhibited repeatable behavior up 9.35 MPa detection limit 18.62