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 article deals with the fully coupled electromechanical responses of an infinitely long piezoelectric tube as a sensor or an actuator. By adopting the variational approach for generalized loading conditions and utilizing Hamilton's principal, the governing differential equations of an infinitely long piezoelectric tube subjected to natural boundary conditions are derived. For studying the direct and converse effect of the piezoelectric tube, the obtained governing equations are solved to give the exact solutions corresponding to different boundary conditions prescribed for the tube functioning as a sensor or an actuator. For numerical illustrations of our analysis, polyvinylidene difluoride and lead zirconate titanate, which are widely used in industries nowadays, are chosen as the materials for our investigations. The piezoelectric tubes made of these materials are investigated with thorough discussions over their different electromechanical responses.
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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