Analysis of vibrations and nonlinear dynamic buckling of bicurved composite shells under the effect of thermal loading.

Pourmoayed, Alireza; Malekzadeh Fard, Keramat

doi:10.22065/jsce.2023.394985.3104

Analysis of vibrations and nonlinear dynamic buckling of bicurved composite shells under the effect of thermal loading.

Document Type : Original Article

Authors

Alireza Pourmoayed ¹

Keramat Malekzadeh Fard ²

¹ Assistant Professor,, Department of Mechanical Engineering, Khatamul-Anbiya Air Defense University, Tehran, Iran.

² Malek ashtar univ. of technology, Professor ,

10.22065/jsce.2023.394985.3104

Abstract

In this article, nonlinear thermomechanical analysis of transient vibrations and buckling stability of shallow composite bicurve shell under thermal loading has been performed. Both the geometric nonlinearity of the structure and the nonlinearity of material properties resulting from temperature changes in the analysis have been used. First-order shear theory and Hamilton's principle were used to derive the crustal motion equations and boundary conditions. In the following, the Ritz method is used to solve these equations. In order to distribute the temperature inside the shell, it is assumed that the temperature changes with time and coordinates only along the thickness. In addition, the effect of important parameters such as the effects of layering order, curvature and thickness of the shell on the temporal evolution of temperature and deflection of flat composite shell and bicurved under thermal boundary conditions has been studied. In order to validate the results, The deflect of center a homogeneous square plate under thermal loading was compared with the research results mentioned in the literature. Also, the results of thermal dynamic buckling of the composite shell under thermal load show that by decreasing the thickness of the shell, the elapsed time until the threshold of dynamic buckling is decreased. The necessary and sufficient conditions for the occurrence of dynamic buckling phenomenon are the absence of transverse loading and the application of the clamped boundary condition. It is also necessary to include nonlinear effects to find the buckling response.

Keywords

Forced vibrations

dynamic buckling

temperature

Ritz method

first order shear theory

Subjects

Structural Mechanics

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