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Abstract Due to the high specific strength and stiffness, thin-walled shells are widely used in aerospace engineering structures. However, along with the increase of the structure size or the structure hierarchy, the computational cost of the post-buckling analysis of thin-walled shells would increase sharply and then the imperfection sensitivity analysis would become time-consuming. In this study, an accelerated Koiter method is proposed to improve the efficiency of post-buckling analysis and imperfection sensitivity analysis of thin-walled shells under axial compression. In the framework of the accelerated Koiter method, a single mode Koiter method considering pre-buckling nonlinear behavior is used to reduce the computational time of repeated imperfection analysis, which can accurately predict the effect of the small amplitude imperfection. Furthermore, in order to obtain the expanded point of Koiter method, a Combined Approximation (CA)-based iterative eigenvalue algorithm is constructed to obtain the pre-buckling state in the neighborhood of the bifurcation point and reduce computational cost by the reasonable step length prediction. Finally, the efficiency and accuracy of the proposed method are demonstrated by means of four illustrative examples, including the composite cylindrical shell, the isotropic cylindrical shell, the isotropic conical shell and the hierarchical stiffened cylindrical shell under axial compression.
Highlights Combined Approximation (CA) method is used to reduce the computational time of consistently eigenvalue problem. The CA-based iterative eigenvalue algorithm is constructed to obtain the pre-buckling state near the buckling load. The accelerated Koiter method is developed for fast imperfection sensitivity analysis of thin-walled shells. Four representative examples are carried out to verify the effectiveness of the proposed method.
Abstract Due to the high specific strength and stiffness, thin-walled shells are widely used in aerospace engineering structures. However, along with the increase of the structure size or the structure hierarchy, the computational cost of the post-buckling analysis of thin-walled shells would increase sharply and then the imperfection sensitivity analysis would become time-consuming. In this study, an accelerated Koiter method is proposed to improve the efficiency of post-buckling analysis and imperfection sensitivity analysis of thin-walled shells under axial compression. In the framework of the accelerated Koiter method, a single mode Koiter method considering pre-buckling nonlinear behavior is used to reduce the computational time of repeated imperfection analysis, which can accurately predict the effect of the small amplitude imperfection. Furthermore, in order to obtain the expanded point of Koiter method, a Combined Approximation (CA)-based iterative eigenvalue algorithm is constructed to obtain the pre-buckling state in the neighborhood of the bifurcation point and reduce computational cost by the reasonable step length prediction. Finally, the efficiency and accuracy of the proposed method are demonstrated by means of four illustrative examples, including the composite cylindrical shell, the isotropic cylindrical shell, the isotropic conical shell and the hierarchical stiffened cylindrical shell under axial compression.
Highlights Combined Approximation (CA) method is used to reduce the computational time of consistently eigenvalue problem. The CA-based iterative eigenvalue algorithm is constructed to obtain the pre-buckling state near the buckling load. The accelerated Koiter method is developed for fast imperfection sensitivity analysis of thin-walled shells. Four representative examples are carried out to verify the effectiveness of the proposed method.
Accelerated Koiter method for post-buckling analysis of thin-walled shells under axial compression
Thin-Walled Structures ; 155
2020-07-08
Article (Journal)
Electronic Resource
English
Buckling of thin-walled cylindrical shells under axial compression
| Tema Archive | 2009
Five Papers on the Buckling of Thin-Walled Circular Cylindrical Shells under Axial Compression
| UB Braunschweig | 1971
Buckling of cylindrical shells under axial compression
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