3D Effects of Electro-Thermo-Mechanical Loads on the Behavior of Thick-Walled Piezoelectric Cylinder Reinforced by Functionally Graded BNNTs

چکیده مقاله

Electro-thermo-elastic stress response of piezoelectric functionally graded composite thick-walled cylinder reinforced by boron-nitride nanotubes (BNNTs) is presented in this article. The electro-thermo-elastic properties of functionally graded boron nitride nanotube- reinforced composites (FG-BNNTRCs) was studied by a modified XY micromechanical model capable of exhibiting full coupling relation between electric, thermal and elastic fields. Assuming piezoelectric fiber reinforced composite (PEFRC) material to be linear, homogenous, orthotropic, and perfectly bonded with uniform applied field, the basic relation for the axisymmetric deformation of a thick-wall cylinder subjected to uniform internal and external pressures, an axial electrical load, a temperature change T ∆ between inner and outer radius are obtained. The cylinder has end caps and is free to change length, displacement and strains. The results show that the stresses of the thick-walled cylinder can be decreased as a result of BNNT reinforcement. It is found that increasing temperature decreases stresses and electric field has poor effect on the stress resultants.