Abstract
The composite cylindrical shell pressure structure is widely used for autonomous underwater vehicle (AUV). To analyze the critical buckling problem of variable stiffness (VS) composite pressure structure of AUV, a discrete finite element (DFE) method based on the curve fiber path function is developed in this work. A design and optimization method based on the radial basis function surrogate method is proposed to optimize the critical buckling pressure for a VS composite cylindrical shell. Both the DFE and surrogate methods are verified to be valid by comparison with the experimental data from the listed references. The effects of the geometric parameter and fiber angle on the critical buckling pressure are studied for different cylindrical shell cases. The results indicate that the proposed simulation model and optimization method are accurate and efficient for the buckling analysis and optimization of a VS composite cylindrical shell. Optimization result shows that the optimum critical buckling pressure for the VS cylindrical shell is improved and is 21.1% larger than that of the constant stiffness cylindrical shell under the same geometric and boundary condition.
Highlights
Composite materials are widely used in the ocean field because of the excellent features including the specific stiffness, specific strength, and high resistance to fatigue and corrosion, etc. [1,2]
The optimum Pcr corresponding with optimized fiber angle for both the variable stiffness (VS) and constant stiffness (CS) cylindrical shells is obtained to discuss the improvement of Pcr under the identical boundary conditions and fixed geometric parameters
The surrogate model is built about the critical buckling pressure corresponding with 100 sample points of the fiber angle and cylindrical radius for the VS cylindrical shell
Summary
Composite materials are widely used in the ocean field because of the excellent features including the specific stiffness, specific strength, and high resistance to fatigue and corrosion, etc. [1,2]. Labans et al [26] proposed an experimental method to study the buckling pressure and natural frequency for the curvilinear fiber composite cylindrical shells under the axial compression They presented an approximate and simplified simulation model for the cylinders to show a comparison analysis. A radial basis function-neural network surrogate model is trained and built to optimize the Pcr. The sections are arranged as follows: Section 2 illustrates the problem formulation, including the relevant theories and equations for composite cylindrical shell; Section 3 explains the details of the DFE method based on the curve fiber path function and the process of surrogate model; in Section 4, the built model is verified and discussed by comparison with experimental data; Section 5 is the results and discussions; and Section 6 draws the conclusion
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