A single-walled carbon nanotube reinforced 1–3 piezoelectric composite for active control of smart structures

Abstract

We propose a new 1-3 piezoelectric composite comprised of armchair single-walled carbon nanotubes imbedded in a piezoceramic matrix which we call a NRPEC (nanotube reinforced 1-3 piezoelectric composite). Values of effective piezoelectric and elastic moduli of the NRPEC determined through a micromechanical analysis are found to be significantly higher than those of the 1-3 piezoelectric composite comprised of piezoelectric fibers imbedded in an epoxy matrix. The performance of the NPREC as a constraining layer in an active constrained layer damping (ACLD) treatment of a laminated composite beam has been studied by the finite element method. Both in-plane and out-of-plane actuations by the constraining layer of the ACLD treatment have been considered, and its length has been optimized by implementing a controllability criterion. The computed controllability measure and the frequency response reveal that the proposed constraining layer performs better than the 1-3 piezoelectric/epoxy composite layer.

Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

“…Carbon nanotubes have aroused increasing interest due to their remarkable tensile strength, high mechanical strength, flexibility brilliant electrical and physicochemical properties and other unique structural, mechanical characteristics [7][8][9][10]_ENREF_6_ENREF_8. Attempts have been made to create advanced engineering materials with new or better properties through the incorporation of CNT in the selected matrices such as polymers, metals and ceramics [11].…”

Least-squares method for laminated beams with distributed braided piezoelectric composite actuators

“…Since the geometric structures have a great influence on the mechanical and electrical properties of piezoelectric composites, a great deal of studies have been completed to optimize the structures and properties of piezoelectric composites during the past decades (Lisnevskaya et al, 2017). Ray and Batra (2007) proposed the carbon-nanotube-toughened piezoelectric ceramic matrix composite and predicted its effective piezoelectric constants and elastic modulus. Zhao et al (2016) prepared a cement-sand-based smart piezoelectric composite to improve the incompatibility between the piezoelectric ceramics and reinforced concrete.…”

Energy-harvesting enhancement in composites of microwave-exfoliated KNN and multiwall carbon nanotubes

“…Carbon nanotube (CNT) reinforced polymer compositebased piezoelectric materials show remarkable enhancement in the stability of the poled domain state and improvement in processing sensitivity and thermal stability [31][32][33][34]. An increase of 61.3% in piezoelectric charge coefficient (19.8 pC/N), 67% increase in dielectric constant, 89% increase in dielectric loss factor, significant elastic moduli with a good frequency and energy conversion response were reported for CNT reinforced PZT-PVA 0-3 and CNT-PZT epoxy matrix composites [31][32][33][34]. Even though the CNT is a potential candidate for tailoring the functional properties of piezoelectric ceramics, no research studies have focussed on developing CNT reinforced KNN-based piezoelectric energy harvesters (PEHs).…”