轴向冲击载荷下薄壁折纹管的屈曲模态与吸能

在方管的基础上引入折纹结构, 利用几何关系建立折纹管的折角公式。采用LS-DYNA软件研究了6种折纹管在轴向冲击下的屈曲模态与能量吸收性能, 并与方管进行对比分析。结果表明, 折纹管在冲击载荷作用下屈曲变形过程可分为3个阶段, 初始峰值阶段、稳定渐进屈曲阶段和密实化阶段。折角是影响初始峰值载荷和平均载荷的重要因素之一, 折纹结构的引入有效的降低了初始峰值载荷, 减小了冲击力的波动幅度; 折纹管的比吸能低于方管, 但是在特定折角下, 折纹管的压缩力效率和比总体效率高于方管。

Buckling and energy absorption properties of thin-walled corrugated tubes under axial impacting

The square tube with pre-designed corrugations shape is presented and the folding angles formula of the corrugated tubes is established in this study base on geometrical relationship.Buckling modes and energy absorption of square tube and six kinds of corrugated tubes under axial impacting are compared and analyzed by LS-DYNA.The simulation result shows that deformation of tubes can be divided into three stages, including the initial peak stage, the stable progress buckling stage and the densification stage.The folding angle is one of important influence factors on the initial peak force and mean force.The pre-designed corrugations demonstrate some obvious advantages at reducing initial peak force and the fluctuation range of impact force curves which are smoother than the square tube.In addition, the specific energy absorption of the corrugated tubes are lower than the square tube, while the crush force efficiency and specific total efficiency of corrugated tube with a certain folding angle are higher than those of the square tube.