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In the present research, static stress analysis of carbon nanotube-reinforced composite (CNTRC) cylinder made of polyvinylidene fluoride is carried out. Nonaxisymmetric thermo-mechanical loads are applied on composite cylinder in the presence of uniform longitudinal magnetic field and radial electric field. The surrounded elastic medium is modelled by Pasternak foundation because of its superior to the Winkler model. By means of MoriTanaka method, mechanical properties of CNTRC cylinder are obtained. To enhance the accuracy of results, equilibrium equations are solved analytically by Fourier series approach and distribution of electric displacements, radial, circumferential and effective stresses in CNTRC cylinder are determined. Remarkable effects such as magnetic field intensity, elastic medium, orientation angle and volume fraction of carbon nanotubes (CNTs) on the distribution of effective stress are investigated. Results demonstrate that fatigue life of CNTRC cylinder is significantly dependent on magnetic intensity, orientation angle and volume fraction of CNTs. Results of this investigation can be utilized for optimum design of thick-walled composite cylinders under multiphysical fields.

Magnetorheological fluids are materials that react to the applied magnetic field and are converted to the quasi-solid phase from the liquid one. Their applications in control and suppression of vibration have interested scientists nowadays. The present study is focused on the vibrational behavior of magnetorheological fluid circular plates that are embedded with magnetostrictive face layers. Magnetostrictive materials are also playing an important role in vibration control and are used widely in smart devices such as sensors and actuators. The structure is exposed to the transverse monotonic magnetic field and is located on the visco-Pasternak elastic substrate. Using Hamilton’s principle and based on classical plate theory, the motion equations and boundary conditions are extracted, and the generalized differential quadrature method is selected to solve them. Three different types of magnetorheological fluids are considered, and their effect on the results is discussed. The outcomes of this study can be used to design more capable and precise dampers, smart structures, and devices.

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