Energy Dissipation in Structural Systems Containing MetallicTubular Elements

该研究计划涉及实验和分析 准静态与冲击消能研究 含有金属管的结构系统的特性， 能量耗散元件 研究的具体目标包括以下五个方面 任务 在任务1中，团簇的能量耗散特性 将优化未加肋和加肋的管状组件 相对于其管间边界条件，其半径 壁厚比，以及它们的应变硬化和应变速率 特性. 任务2涉及确定以下方面的重要性： 冲击载荷作用下圆管的初始弹性响应 导致弹性-粘塑性响应。 在任务3中， 将研究均匀的管状塌陷模式。 任务4将 研究复合材料（泡沫填充）金属管的性能 在大变形条件下。 最后，任务5将概括 年发展起来的一维结构冲击波理论 以前的NSF资助的研究，以两个维度，并利用它来建模 任务1的撞击实验。 这项研究将填补冲击力学这一领域的空白， 提供直接适用于发展更多 有效的金属能量耗散系统。 等 系统在安全使用时具有救生潜力 在动能必须以一定的速度耗散的应用中， 控制方式，使减速保持在允许范围内 限制.

The research program involves an experimental and analytical investigation of the quasi-static and impact energy dissipation characteristics of structural systems containing metallic tubes as energy dissipating elements. The specific objectives of the research include the following five tasks. In Task 1, the energy dissipation characteristics of clusters of unstiffened and stiffened tubular assemblies will be optimized with respect to their intertubular boundary conditions, their radius to wall thickness ratios, and their strain-hardening and strain-rate properties. Task 2 is concerned with establishing the importance of the initial elastic response of tubes subjected to impact loading resulting in an elastic-viscoplastic response. In Task 3, non- uniform tubular collapse modes will be studied. Task 4 will investigate the behavior of composite (foam-filled) metallic tubes under large deformation conditions. Finally, Task 5 will generalize the one-dimensional structural shock-wave theory developed in previous NSF funded research to two dimensions and employ it to model the impact experiments of Task 1. This research will fill a void in this area of impact mechanics and provide results directly applicable to the development of more efficient and effective metallic energy dissipating systems. Such systems have a life saving potential when employed in safety applications where kinetic energy must be dissipated in a controlled manner such that decelerations remain within allowable limits.