应力波作用下弹性直杆动力分叉屈曲研究

摘要

对弹性直杆在应力波作用下动力分叉屈曲进行分析与探讨，提出求解应力波作用下直杆动力屈曲数值方法。该方法统一双特征参数法与最优模态法思想，可用于解决时变动载荷作用下屈曲问题，且对阶跃载荷及时变动载荷引起的应力波作用下屈曲问题具有统一屈曲判别形式，与实验数据对比表明该方法准确、可行。%The dynamic bifurcation buckling of an elastic straight rod under stress wave was studied.A numerical method,which unifies the ideas of twin-characteristic-parameters method and method of preferred mode,was proposed. The method can be used to solve the buckling of rod under time-varying load,with a unified buckling discriminating form for dynamic buckling under stress wave caused by both step load and time-varying load.The calculation results predicted by this method are in good agreement with the experimental results.