Thermomechanical postbuckling of composite laminated cylindrical shells with local geometric imperfections |
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| Institution: | 1. Department of Civil and Environmental Engineering, Imperial College London, London, UK;2. Mechanical Engineering, Laser Processing, School of Energy Systems, Lappeenranta University of Technology, Lappeenranta, Finland;1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong Province, 510641, People''s Republic of China;2. State Key Laboratory of Subtropical Building and Urban Science, South China University of Technology, Guangzhou, Guangdong Province, 510641, People''s Republic of China;3. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, UNSW Sydney, NSW 2052, Australia |
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| Abstract: | The effect of local geometric imperfections on the buckling and postbuckling of composite laminated cylindrical shells subjected to combined axial compression and uniform temperature loading was investigated. The two cases of compressive postbuckling of initially heated shells and of thermal postbuckling of initially compressed shells are considered. The formulations are based on a boundary layer theory of shell buckling, which includes the effects of the nonlinear prebuckling deformation, the nonlinear large deflection in the postbuckling range and the initial geometric imperfection of the shell. The analysis uses a singular perturbation technique to determine buckling loads and postbuckling equilibrium paths. Numerical examples are presented that relate to the performances of cross-ply laminated cylindrical shells with or without initial local imperfections, from which results for isotropic cylindrical shells follow as a limiting case. Typical results are presented in dimensionless graphical form for different parameters and loading conditions. |
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