中文摘要：

利用显式动力学有限元方法对弹性直杆的动力后屈曲进行了分析；模拟了弹性直杆轴向碰撞动力屈曲的变形及发展过程。分析中将碰撞杆视为无初始缺陷的理想直杆，将弹性直杆动力屈曲双特征参数的解答作为非线性动力后屈曲求解的初始条件，实现了对无缺陷理想直杆的动力后屈曲分析。计算结果与文献中的实验数据获得了很好的一致。计算结果同时也揭示了直杆动力屈曲变形发展的机理，以及轴向应力波和屈曲变形的相互作用规律。

英文摘要：

By use of finite element method of explicit dynamics, the dynamic post-buckling of elastic perfect bars subjected to axial high-velocity impact is investigated. The initial dynamic buckling with a small amplitude parameter, given by the twin-characteristic-parameter solution, is employed as the initial condition of the nonlinear dynamic solution. Results obtained in the present study agree well with the experimental data in the reference. The present investigation reveals the mechanism of growth and spread of buckling deformation in the bar and the interaction between the axial stress wave and the buckling deformation during their impacting.