In this paper, the influence of carbon nanotube functionalization on interfacial shear strength and hence on damping
characteristics of CNT-based polymeric composites is investigated with a multiscale model. The sequential multiscale approach consists of two parts. First, the interfacial shear strength between the functionalized nanotube and the polymer is calculated by simulating a CNT pull-out test using the molecular dynamics method. The strength values obtained from atomic simulation are then applied to a micromechanical damping model of a representative unit cell of a CNT/polymer composite under cyclic loading. The analysis results indicate that the nanotube functionalization increases the interfacial shear strength. The increased shear strength can either enhance or reduce the effective loss factor of the composite, depending on the operational stress range.
This paper presents an analysis on the structural damping characteristics of polymeric composites containing dilute,
randomly oriented nanoropes. The SWNT (single-wall nanotube) rope is modeled as a closed-packed lattice consisting
of seven nanotubes in hexagonal array. The resin is described as a viscoelastic material using two models: Maxwell
model and three-element standard solid model. The composite is modeled as a three-phase system consisting of a resin,
a resin sheath acting as a shear transfer zone, and SWNT ropes. The "stick-slip" mechanism is proposed to describe the
load transfer behavior between a nanorope and a sheath and between individual SWNTs. The analytical results indicate
that the loss factor of the composite is sensitive to stress magnitude. It is illustrated that the "stick-slip" friction is the
main contribution for the total loss factor of CNT-based composites even with a small amount of nanotubes/ropes.
This paper presents the results of an investigation of the structural damping characteristics of polymeric composites containing randomly oriented nanoropes. The SWNT (single-walled nanotube) rope is modeled as a closed-packed lattice consisting of seven nanotubes in hexagonal array. The composite is described as a three-phase system consisting of a resin, a resin sheath acting as a shear transfer zone, and SWNT ropes. The "stick-slip" mechanism is proposed to describe the load transfer behavior between a nanorope and a sheath and between individual SWNTs. The analytical results indicate that both the Young’s modulus and loss factor of the composite are sensitive to stress magnitude. Also, to address the orientation effect on inter-tube sliding and tube/sheath sliding, the Young’s moduli and loss factors of composites filled with aligned nanoropes and randomly oriented nanoropes are compared.
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