空间薄壁弹性伸杆力学特性分析

Analysis of mechanical properties of spatial thin-walled elastic extension bar

摘要:

为研究弹性伸杆的力学性能,对其压平、拉平过程中的能量与外载荷的变化以及刚度进行了分析. 首先对弹性伸杆的刚度进行了理论分析,找出了影响弹性伸杆刚度的参数. 之后通过ABAQUS对弹性伸杆的拉平与压平的过程进行了仿真分析,并运用控制变量法分析了各项参数对刚度的影响. 仿真结果表明,拉平与压平过程中的能量变化基本一致,而压平所需要的外载荷较小. 增大弹性伸杆的弧段半径、铺层数量和中心距,相同载荷下的弹性伸杆的变形量会逐渐降低. 通过对仿真结果的分析可知,在拉平与压平的开始阶段外载荷较小,外载荷的峰值出现在拉平与压平的最终阶段,增大弹性伸杆的弧段半径、中心距和铺层数量能够有效提高弹性伸杆的刚度.

Abstract:

To study the mechanical properties of spatial thin-walled elastic extension bar, the change of energy, external load during leveling and flattening and stiffness are analyzed. Firstly, the stiffness of elastic extension bar is theoretically analyzed, and the parameters that affect the stiffness of elastic extension bar are found out. Then, the process of flattening and leveling the elastic extension bar is simulated by ABAQUS, and the influence of various parameters on the stiffness is analyzed by using the control variable method. The simulation results show that the energy variation in the leveling process is basically consistent with that in the flattening process, but the external load required for the flattening is relatively small. With the increase of the radius of arc section, the number of layers and the center distance, the deformation of the elastic extension bar will gradually decrease under the same load. By the analysis of the simulation results, it can be seen that the external load is smaller in the initial stage of flattening and leveling, and the peak value of the external load appears in the final stage of flattening and leveling, and the stiffness of elastic extension bar can be improved effectively by increasing the radius, center distance and the number of layers.