轴向冲击载荷下薄壁环形叠管动力屈曲分析

Dynamical Buckling Specialty of Thin Ring Pile Tube under Axial Impact Load

根据屈曲分析的有限元基本理论,利用ANSYS/LS-DYNA通过实体建模对薄壁环形叠管进行仿真计算,从网格密度、材料属性、单元类型、接触类型、沙漏控制等五个方面讨论了薄壁环形叠管在轴向冲击力作用下的屈曲变化情况,并得到了环形叠管不同时刻的变形情况和应力、应变分布情况。结果表明,采用该软件进行薄壁环形叠管的动力屈曲分析是可行的,能够代替真实实验,节省成本。研究薄壁环形叠管变形、屈曲特征为其在新型吸能元件、工程应用方面提出新的思路,对理论分析、实验指导具有重要意义。

According to the basic theory of finite element buckling analysis,by use of ANSYS/LS-DYNA,the simulation calculation of thin-walled ring pile tube was carried out by solid modeling.Changing situation of buckling of thin-walled ring pile tube under axial impact force was discussed from the aspects of mesh density,material properties,element type,contact type,hourglass control.Deformation,stress,strain distribution of thin-walled ring pile tube at different moments were obtained.The result shows that using the software to carry out buckling analysis of thin-walled ring pile tube is feasible,can replace the real experiment,and cut down the cost.Studying thin-walled ring pile tube deformation and buckling characteristics put forward a new train of thought for its application in new energy absorption components,being of a great significance for the theoretical analysis and experiment guidance.