Electrical Conductivity of Glass Fiber-Reinforced Plastic with Nanomodified Matrix for Damage Diagnostic

Abstract

The electrical conductivity of glass fiber-reinforced plastic (GFRP) with epoxy matrix modified by multiwall carbon nanotubes (MWCNT) was studied. The electrical conductivity of nanomodified lamina and multi-layered GFRP was investigated on several levels using a structural approach. Components of the electrical conductivity tensor for unidirectional-reinforced monolayer were calculated similarly as in micromechanics using the conductivity of the nanomodified matrix. The electrical conductivity of multilayer composite was calculated using laminate theory and compared with values measured experimentally for various fiber orientation angles. Calculated and experimental data were in good agreement. The voltage distribution measured throughout the laminate allowed detecting the damage in its volume. The electrode network located on the laminate surface could determine the location, quantification, and geometry of the damage in the GFRP lamina modified with MWCNT. Experimental and calculated electrical resistance data for GFRP double-cantilever beam specimens were investigated in Mode I interlaminar fracture toughness test. Results demonstrate that electrical resistance could be successfully used for the diagnostic of the crack propagation during interlaminar fracture of the MWCNT-modified GFRP.

Electrical Resistivity of 3D-Printed Polymer Elements

“… where σ 11 is specimen conductivity along the printing direction and σ 22 is specimen conductivity transversal to the printing direction in the 1–2 plane. The conductivity of the specimen in the specific case of printing direction angle θ rather than 0° was calculated using the components σ 11 and σ 22 , similar to the previous study [ 29 ], where such calculations were performed for a unidirectionally fibre-reinforced composite: where σ′ 11 is specimen conductivity at a specific printing angle θ . Components σ 11 and σ 22 were experimentally predetermined.…”

Scalable MXene and PEDOT-CNT Nanocoatings for Fibre-Reinforced Composite De-Icing

“…In the early 21st century, the fabrication of nanoparticles such as graphenes (GP) and carbon nanotubes (CNT) has led researchers to explore their new applicability [ 15 , 16 , 17 ]. Due to high electrical conductivity and low thickness, the formation of ultrathin coatings for Joule heating has gained attention [ 18 ].…”