On the formulation of a finite element method for the general pipe-in-pipe structure system: Impact buckling analysis

摘要

Highlights?A finite element method for general pipe-in-pipe structure system is developed.?The cross-section of the pipe-in-pipe structure system can be defined as any shape.?A novel algorithm to determine the location of impact between the inner pipe and the outer pipe is proposed.?Nonlinear finite element implementation details are presented.?Four kinds of pipe-in-pipe structures are analyzed, the results are compared with ANSYS.AbstractA nonlinear finite element method is developed for a general pipe-in-pipe structure system, which is constructed as an inner pipe and an outer pipe. A novel algorithm for the impact buckling analysis between the inner pipe and outer pipe is presented. The arc length of the deformed pipe in the circumferential direction is used to directly determine the impact location. By using a pipe element with an arbitrary cross-section, the method has broad potential applications. Moreover, the configuration of the general pipe-in-pipe structure system is exactly smooth and continuous for any arbitrary cross-sections. Large deformation and finite strain are both considered. Nonlinear finite element implementation details are also given. Four different pipe-in-pipe structure systems are analyzed. A convergence study of the displacement order is also presented, and the results are verified with ANSYS and experiment. We observed that the proposed method is very accurate.Graphical abstractDisplay Omitted]]>