Size-dependent vibration of bonded double Boron-Nitride nanotube reinforced composite microtubes conveying fluid

This study investigates the nonlinear vibration in a coupled system of Boron-Nitride nano-tube reinforced composite(BNNTRC) micro-tubes conveying viscous fluid. Single-walled Boron-Nitride nano-tubes (SWBNNTs) are arranged ina longitudinal direction inside Poly-vinylidene fluoride (PVDF) matrix. Based on piezoelectric fiber reinforced composite(PFRC) theory, properties of BNNTRC micro-tubes are obtained. Damping and shearing effects of surrounded mediumare taken into account by visco-Pasternak model. To enhance the accuracy of results, strain gradient theory is developedin cylindrical shell model. Results indicated that in micro-scale, the strain gradient theory is more accurate than othertheories. Results of this investigation can be applied for optimum design of micro/nano-electro-mechanical systems(MEMS/NEMS) such as shell and tube heat exchangers in micro scale.

کلیدواژه ها:

Coupled composite micro-tubes ، visco-Pasternak foundation ، Strain gradient theory ، PFRC theory