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The stress state analysis of the sealing cylinder is of great significance for the safe operation of the sealing system. In this study, we probe a sealing system that can be simplified as an axisymmetric problem. In service, the rubber around the central pipe contacts the casing under the action of the axial pressure, and thus the sealing function is realized. The analytical solution of the stress at the sealing interface is derived based on the Love strain function in the axisymmetric configuration. Then, the relationship between the axial pressure and the gap (between the sealing cylinder and the casing) is presented, and the contact pressure at the contact interface is also given. The numerical simulation is performed, which is in agreement with the analytical solutions in the two deformation stages. The obtained results in the current work have also been comprehensively compared with the previous results, to give suggestions for engineering selection. These findings are beneficial to obtain a deep understanding on the mechanism of the sealing process, and provide some inspirations on the new types of sealing tools for mechanical engineering, chemical engineering, petroleum engineering, etc.

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Magnetic field driven robots have a wide spectrum of applications in many areas, such as in biomedical experiment, surgical tools, aerospace and mechanical engineering. In the present study, we make a comprehensive investigation on the deformation and motion of a mesh shaped robot controlled by the magnet. First we have prepared the matrix material of the robot, which is a mixture of silica gel and NdFeB powders. Then the deformation and motion of the robot driven by the magnet are recorded, and the warping and arching configurations are analyzed. The experimental phenomena have been compared with the numerical simulation and theoretical analysis, and the results are in excellent agreement. These findings are beneficial to engineer new types of intelligent robots, as well as to put them in various industrial settings.