Taking LNG tank containers as research objects, the strength reserve and displacement field of the tank were given by establishing its finite element model under stacking test conditions. The stacking buckling of the tank frame structure under multiple real loads was analyzed and calculated by using the Block Lanczos method, and the buckling modes of the frame and the corresponding critical loads were given. The strength distribution, the weakness, stability modes and macro stability reserves of the tank structure were clarified. It was concluded that the weak parts of the tank under stacking test conditions were upper frame short section and connection between frame and tank. The upper frame short section was the preferred location for stiffness reinforcement. In addition,the analysis shows that the stability of the tank frame is high and strength is the primary consideration in the design of this type of tank frame. This paper provided a reference for the design and check of the strength and stability of similar structures.

The wormlike sealing ring is located in the sealed groove of Dn1160 type pressure sintering furnace, which is prone to tear and damage.This article uses the finite element analysis method to nonlinear contact analysis of wormlike ring. The Von Mises stress and contact stress of worm⁃shaped rings are numerically simulated by Ansys software, and the results are compared.The cracking failure characteristics and easy tearing positions of worm⁃shaped rings under different parameters and working conditions are obtained. At the same time, the research results of predecessors are consulted to further optimize ring sealing ability.Finally, the research results provide a new idea for the design and optimization of the same kind of seal ring.

The finite element analysis software ANSYS was used to propose a parametric model of the quickopening structure with toothlocked sintering furnace cover. The structure design was optimized by using weight parameter as the objective function and using allowable stress as constraints. Based on the optimal sizes the intensity design requirements were met and the weight of the structure was reduced effectively. Data reference for the similar quickopening structure design was given in this paper.