Nonlinear vibration characteristics of elastically supported FRP cylindrical shells under temperature gradient conditions: Theoretical and experimental studies

• Hui Li ^[2] ; Zeyu Zou ^[2] ; Jichuan Cao ^[2] ; Yuen Xia ^[1] ; Xiangping Wang ^[3] ; Haiyu Lv ^[2] ; Wei Sun ^[2] ; Qingkai Han ^[2] ; Sung Kyu Ha ^[1]
  1. [1] Hanyang University

     Hanyang University

     Corea del Sur

     
  2. [2] School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China
  3. [3] Key Laboratory of Impact Dynamics on Aero Engine, AECC Shenyang Engine Research Institute, Shenyang, China

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• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 52, Nº. 8, 2024, págs. 5457-5477
• Idioma: inglés
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• Resumen

  • The nonlinear free vibrations of elastically supported fiber-reinforced polymer cylindrical shells (FRPCSs) under temperature gradient conditions are investigated using both theoretical and tested techniques. A dynamic model of the FRPCSs with consideration of such complex thermal conditions is firstly established based on the first-order shear deformation theory in conjunction with Hamilton’s principle, the Galerkin method, the artificial spring technique, etc. Numerical results at room temperature and in a uniform thermal environment with classical or arbitrary boundary conditions are utilized to give a rough validation of this model. Subsequently, a thermal-vibration system is set up to measure the nonlinear natural frequencies of two FRPCS specimens subjected to four different temperature gradient conditions in free-free boundary constraints, and iterative calculations are performed to identify the temperature-dependent material properties. Finally, the detailed comparisons of calculated and experimental results provide a solid validation of the proposed model. This study offers a practical model tool to forecast the nonlinear free vibrations of the FRPCSs in a complex thermal environment, which can be readily adjusted and extended to other forms of composite shells. Also, the predicted and measured results can help assess the structural thermal-vibration behaviors when the temperature gradient effect needs to be considered. Communicated by Makoto Ohsaki.