On the effect of viscoelasticity on behavior of gyroscopes

Dastjerdi S., AKGÖZ B., Civalek O.

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE, cilt.149, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 149
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.ijengsci.2020.103236
  • Dergi Adı: INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, INSPEC, Metadex, zbMATH, Civil Engineering Abstracts
  • Anahtar Kelimeler: Spherical FGM/FVT gyroscope structure, Nonlocal elasticity theory, Semi-Analytical Polynomial Method (SAPM), Hygro-thermal environment, Angular velocity, SHEAR DEFORMATION-THEORY, THERMO-MECHANICAL BEHAVIORS, NONLINEAR BENDING ANALYSIS, FREE-VIBRATION ANALYSIS, CURVED SHALLOW SHELLS, DYNAMIC-ANALYSIS, SPHERICAL-SHELL, HOLLOW SPHERES, ELASTICITY, STRESSES
  • Akdeniz Üniversitesi Adresli: Evet

Özet

In the present study, the size- and time-dependent viscoelastic bending analysis of rotating spherical nanostructures made of functionally graded materials (FGMs) is performed. To simulate gyroscopic rotation, the structure is assumed to be rotated around two axes with constant angular accelerations. The nonhomogeneous nanostructure with functionally variable thickness (FVT) is assumed as FGM/FVT structure. Geometrically, the inner side of the structure has a spherical shape and the outer side is considered as an ellipse or any other arbitrary function. The size-dependent governing equations and related boundary conditions are obtained by implementing Hamilton's principle based on Eringen's nonlocal elasticity and first-order shear deformation theories. The resulting equations are solved using the Semi-Analytical Polynomial Method (SAPM). The time-dependent deflection is obtained by applying the boundary and initial time conditions. The effects of a hygro-thermal environment and porosity are also considered for a comprehensive analysis. Since no research has been conducted so far on the nonlocal viscoelastic dynamic analysis of FGM/FVT gyroscopes, the classical results are compared with the previously published works and ABAQUS software as well as the effect of many parameters on the results including nonlocality, FGM properties of the structure, thickness changes, angular velocities and accelerations, hygro-thermal environment, porosity, and viscoelastic properties are thoroughly conducted. (C) 2020 Elsevier Ltd. All rights reserved.