Dynamic elastic buckling loads of slender rods and their dependence on geometrical features of specimens at intermediate impact velocities
Dynamic elastic buckling loads of slender rods and their dependence on geometrical features of specimens at intermediate impact velocities
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细长杆的动态弹性屈曲载荷及其对中等冲击速度下试样几何特征的依赖性
DOI：
10.1051/dymat/2009104
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Y. Uchida
中科院分区：
文献类型：
--
作者：
K. Mimura;T. Umeda;I. Riku;M. Yu;Y. Uchida
本研究以实验与数值模拟相结合的方式，探讨柱型与板型长铝杆的动态屈曲行为。实验中采用自由落体式冲击试验机，用载荷传感块法精确测量了屈曲点前的动载荷。在数值分析中，采用动力有限元软件MSC-Dytran对动力屈曲行为进行了模拟，并通过与试验得到的载荷-时间曲线和位移-时间曲线的对比，验证了模拟的有效性和准确性。然后，系统地研究了在不同冲击速度下的动态屈曲载荷。从实验和模拟结果，一个有效的经验准则的动力屈曲的两种类型的杆的冲击速度和细长比。结果表明，柱型杆和板型杆的动力屈曲准则方程中的参数取值非常接近，这意味着在一定的几何尺度下，只要考虑细长比，几何因素对动力屈曲载荷比的影响可能并不显著。
In this research, dynamic buckling behaviors of column-and plate-type long aluminum rods were investigated both experimentally and numerically. In the experiments, a free fall drop-weight type impact testing machine was employed, and dynamic loads of up to buckling points were measured precisely by means of the load sensing block method. In the numerical analyses, dynamic FEM code ‘MSC-Dytran’was used to simulate dynamic buckling behavior, and the validity and the accuracy of the simulation were checked through comparison with experimentally obtained load-time and displacement-time diagrams. The dynamic buckling loads at various impact velocities were, then, systematically investigated. From both experimental and simulated results, an effective empirical criterion for dynamic buckling of both types of rods was derived in terms of the impact velocity and the slenderness ratio. It was found that parameters in the equation to describe the dynamic buckling criterion for column-and plate-type rods take very close values, and this fact implies that the geometrical effect on dynamic buckling load ratio may be not so significant as far as the slenderness ratio is taken into account as a certain geometrical scale.