The process of finite element analysis. The force model has a large number of coils, and the deformation of each circle is basically the same, so only the middle 6 circles are selected for analysis. The hexahedron eight-node complete integration unit is used to divide the network, with a total of 6912 units and 8987 nodes. The models used are Pm-IGHz, ZG memory, and Windows NT operating system. Taking into account the effects of geometric nonlinearity and material nonlinearity, the calculation is divided into 30 steps by time. The initial state and boundary conditions are to overcome the instability of the spring when it is stressed, and lateral displacement boundary conditions must be applied. Since the amount of change in the average diameter of the spring during compression is small, it can be assumed that the average diameter does not change. Therefore, the displacement boundary condition can be applied so that the central axis of the spring wire is not displaced in the radial direction. The compression of the spring is set by the displacement boundary conditions at both ends of the spring: one end of the spring is fixed, and the other end is set to gradually increase the displacement according to time. The increasing speed is 241 cocoa s, and the total analysis time is set to 15, so the total compression is 24 The compression amount per step is 24/30=0.8. Only static effects are considered in the analysis. During the compression process, the coils are uniformly deformed, the stress and strain distribution are uniform, and there is a large local stress and strain at both ends of the spring. When the spring is close to compression, the spring coils at both ends are deformed first, and then compacted first. Then the middle circles are successively tight. The stress and strain distribution on the cross section of the spring wire when the deformation of the compression loading point and the distribution of the mechanical parameters are in compression. The spring analyzed in this problem maintains a flat surface after the deformation of the spring wire section, and substantially no warpage occurs. According to the given spring structure parameters, it is shown by elastic finite element analysis that the spring will be plastically deformed after the rings are pressed, and the maximum plastic deformation occurs inside the spring.
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