气缸螺栓建模方法研究

Research on Bolt Modeling Method of Cylinder

气缸连接螺栓以真实几何形状建模时,模型的最小单元尺寸过小,求解时间步长较短,模型的求解效率较低。针对这一问题,研究可行的螺栓建模方法。基于等截面积思想,提出以方形截面螺栓简化圆形截面螺栓的建模方法,建立了与圆形截面螺栓截面积相等的方形截面螺栓,开展碰撞仿真。对比了方形截面螺栓模型和圆形截面螺栓模型的最大等效应力和求解效率,对方形截面螺栓建模方法进行验证。对比结果表明,方形截面螺栓模型与圆形截面螺栓模型的最大等效应力大小和位置一致性较好,方形截面螺栓模型的最小单元尺寸更小,模型的求解效率更高,为螺栓在整车级有限元碰撞仿真中的高效建模提供参考。

When the cylinder connecting bolts are modeled based on the real geometry,the minimum unit size of model is too small,the solution time-step is short,and the solution efficiency of model is low.To solve this problem,a feasible bolt modeling method is studied in this paper.Based on the idea of equal cross-sectional area,the modeling method of simplifying the circular cross-section bolt with the square cross-section bolt is proposed;and the square section bolt with the same cross-section as the circular section bolt is established and the impact simulation is carried out.The maximum equivalent stress and solution efficiency of square section bolt model and circular section bolt model are compared,and the modeling method of square section bolt is verified.The results show that the size and location of the maximum equivalent stress of the bolt model with square section are consistent with that of the bolt model with circular section.The minimum element size of the bolt model with square section is smaller and the solution efficiency is higher.It would provide a reference for efficient modeling of bolts in finite element collision simulation of vehicle level.