排式矩形薄壁钢管径向冲击屈曲模态分析  

Modal Analysis of Radial Impact Buckling of Multirow Rectangular Thin-wall Steel Tube

作　　者：郭胜鹏[1] 顾红军[1] 

机构地区：[1]徐州空军学院机场工程系,江苏徐州221000

出　　处：《科技导报》2009年第1期64-66,共3页Science & Technology Review

摘　　要：钢管在径向冲击下的屈曲大变形问题对抗爆及抗冲击吸能装置设计具有重要意义。根据实验结果,设定了排式矩形钢管动力屈曲的变形模态,建立了相应的运动场,基于虚速度原理推导出了模态解方程,将问题转化为只含单一变量的方程。计算结果与实验数据对比发现,对于排式矩形钢管径向冲击屈曲问题,模态解方法可以较准确的反映实验现象;当偏转角度较小时,理论值与实验值几乎一致,但当偏转角较大时,理论值明显偏大。分析得出,导致这一偏差的主要原因是应变率效应,因此应变率效应对钢管的变形过程影响显著。Large deformation of steel tube under radial blast wave is an important consideration in the design of anti-explosion and anti-shock energy absorption equipment. According to experimental results, a deformation mode of dynamic buckling of the rectangular steel-tube is assumed, and the displacement and velocity fields are obtained. A modal analysis method is employed based on the virtual velocity principle and an equation with a single variable is obtained. It is concluded by comparison between calculation and experimental data that the modal method accurately recreates the experimental phenomena. When the deflection angle is small, theoretical values agree well with experimental values. But when it is large, the theoretical values become greater than the experimental ones due to the strain-rate effects.

关 键 词：排式矩形钢管 冲击屈曲 模态解 差分法 

分 类 号：TH113[机械工程—机械设计及理论]