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Research Papers: Design and Analysis

Nonlinear Buckling and Postbuckling Behavior of 3D Braided Composite Cylindrical Shells Under External Pressure Loads in Thermal Environments

[+] Author and Article Information
Zhi-Min Li1

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, Chinazmli@sjtu.edu.cn

Zhong-Qin Lin, Guan-Long Chen

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China

1

Corresponding author.

J. Pressure Vessel Technol 131(6), 061206 (Oct 28, 2009) (12 pages) doi:10.1115/1.4000362 History: Received March 13, 2009; Revised July 15, 2009; Published October 28, 2009

Nonlinear buckling and postbuckling behavior for a 3D braided composite cylindrical shell of finite length subjected to lateral pressure, hydrostatic pressure, or external liquid pressure in thermal environments have been presented in this paper. Based on a new micromacromechanical model, a 3D braided composite may be treated as a cell system and the geometry of each cell is deeply dependent on its position in the cross section of the cylindrical shell. The material properties of the epoxy are expressed as a linear function of temperature. The governing equations are based on Reddy’s higher order shear deformation shell theory with a von Kármán–Donnell type of kinematic nonlinearity and including thermal effects. A singular perturbation technique is employed to determine the buckling pressure and postbuckling equilibrium paths. The numerical illustrations concern the postbuckling behavior of perfect and imperfect braided composite cylindrical shells with different values of geometric parameter and of fiber volume fraction in different cases of thermal environmental conditions. The results show that the shell has lower buckling pressures and postbuckling paths when the temperature-dependent properties are taken into account. The results reveal that the temperature changes, the fiber volume fraction, and the shell geometric parameter have a significant effect on the buckling pressure and postbuckling behavior of braided composite cylindrical shells.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of a braided composite cylindrical shell under external liquid pressure and its coordinate system and unit cells for the interior (cells A–D) and the surface (cells E–F)

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Figure 2

Comparisons of strain response for a composite cylinder under hydrostatic pressure

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Figure 3

Effect of temperature dependency on the postbuckling behavior of braided composite cylindrical shell under external pressure: (a) load-shortening and (b) load-deflection

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Figure 4

Effects of temperature changes on the postbuckling behavior of braided composite cylindrical shell under hydrostatic pressure: (a) load-shortening and (b) load-deflection.

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Figure 5

Effects of fiber volume fraction on the postbuckling behavior of braided composite cylindrical shells under hydrostatic pressure: (a) load-shortening and (b) load-deflection

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Figure 6

Effect of shell geometric parameter on the postbuckling behavior of braided composite cylindrical shells under hydrostatic pressure: (a) load-shortening and (b) load-deflection

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Figure 7

Effect of the pressure variation parameter (c1=0.0,0.5,1.0) on the postbuckling behavior of braided composite cylindrical shells under external liquid pressure: (a) load-shortening and (b) load-deflection

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