STRUCTURE SCHEME OF THE ELLIPSOIDAL SHELL ADVANCED COMPOSITE REAR PRESSURE BULKHEAD

Abstract

Abstract: In this paper, nonlinear finite element method is used to analyze the buckling and post-buckling behaviors of different positions and regions of advanced composite ellipsoidal shells under uniform external pressure.The effects of the base diameter, radius of curvature, boundary conditions and bending stiffness on the buckling and post-buckling behaviors were investigated. The range of different shell positions with upper critical load and lower critical load during buckling is determined. Base on this, a grid stiffened structure scheme of the composite rear pressure bulkhead was proposed and optimized. Finally, a method for the reinforcement scheme of the ellipsoidal shell grid structure is determined, and the corresponding grid structure ellipsoid shell has a higher lower critical load. The grid structure determining method thus formed can also be applied to the determination of the reinforcement scheme of the shell-like grid structure.

Key words: composites, rear pressure bulkhead, buckling, ellipsoidal shell, grid-stiffened structure

CLC Number:

TB332

CAI Qi-yang, ZHOU Shi-gang. STRUCTURE SCHEME OF THE ELLIPSOIDAL SHELL ADVANCED COMPOSITE REAR PRESSURE BULKHEAD[J]. Fiber Reinforced Plastics/Composites, 2018, 0(11): 92-98.

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