Electro-thermo-torsional buckling of an embedded armchair DWBNNT using nonlocal shear deformable shell model |
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| Affiliation: | 1. Faculty of Mechanical Engineering, University of Kashan, Kashan, Islamic Republic of Iran;2. Institute of Nanoscience & Nanotechnology, University of Kashan, Kashan, Islamic Republic of Iran;1. School of Science, Chang''an University, Xi''an 710064, China;2. School of Aeronautics, Northwestern Polytechnical University, Xi''an 710072, China;1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, PR China;2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. Department of Fundamental Sciences, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, PR China;2. Department of Mathematics and Information Science, Yulin Normal University, Yulin, Guangxi 537000, PR China;3. School of Zhangjiagang, Jiangsu University of Science and Technology, Zhangjiagang 215600, PR China;4. Bed Bath & Beyond Inc, Union, NJ 07083, USA;5. Hangzhou Xiaoshan Sixth Senior High School, Hangzhou 311200, PR China;1. School of Mechanical Engineering, Iran University of Science and Technology, 16842-13114, Narmak, Tehran, Iran;2. School of Engineering, Damghan University, Damghan, Semnan, Iran;3. Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, Alberta, T2N 1N4, Canada;4. Center of Excellence in Railway Transportation, Iran University of Science and Technology, 16842-13114, Narmak, Tehran, Iran |
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| Abstract: | Electro-thermo-torsional buckling response of a double-walled boron nitride nanotube (DWBNNT) has been investigated based on nonlocal elasticity and piezoelasticity theories. The effects of surrounding elastic medium such as the spring constant of the Winkler-type and the shear constant of the Pasternak-type are taken into account. The van der Waals (vdW) forces are considered between inner and outer layers of nanotube. According to the relationship between the piezoelectric coefficient of armchair boron nitride nanotubes (BNNTs) and stresses, the first order shear deformation theory (FSDT) is used. Energy method and Hamilton’s principle are employed to obtain coupled differential equations containing displacements, rotations and electric potential terms. The detailed parameter study is conducted to investigate the effects of nonlocal parameter, elastic foundation modulus, temperature change, piezoelectric and dielectric constants on the critical torsional buckling load. Results indicate that the critical buckling load decreases when piezoelectric effect is considered. |
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| Keywords: | A Nano-structures A Smart materials B Buckling B Thermomechanical |
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