Electro-Thermo-Dynamic Buckling of Embedded DWBNNT Conveying Viscous Fluid

چکیده مقاله

In this paper, the nonlinear dynamic buc kling of double-walled boron-nitride nanotube (DWBNNT) conveying viscous fluid is investigated based on Eringen's theory. BNNT is modeled as an Euler-Bernoulli beam and is subj ected to combine mechan ical, electrical and thermal loading. The effect of viscosity on fl uid-BNNT interaction is considered based on Navier-Stokes relation. The van der Waals (v dW) interaction between the inner and outer nanotubes is taken into account and the surroun ding elastic medium is simulated as Winkler and Pasternak foundation. Considering the char ge equation for coupling of mechanical and electrical fields, Hamilton's principle is utili zed to derive the motion equations based on the von Kármán theory. Dynamic buckling load is evalua ted using differential quadrature method (DQM). Results show that dynamic buckling lo ad depends on small scal e factor, viscosity, elastic medium parameters and temperature changes. Also, dynamic instability region is discussed for various conditions.