Energy Dissipation in Structural Systems Containing MetallicTubular Elements

包含金属管状元件的结构系统中的能量耗散

• 批准号: 8714346
• 负责人: John Carney
• 金额: $ 21.67万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-10-01 至 1990-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714346&HistoricalAwards=false
• 关键词: Energy; Dissipation; Structural; Systems; Containing

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.

该研究计划涉及对包含金属管作为能量耗散元件的结构系统的准静态和影响能量耗散特性的实验和分析研究。 研究的具体目标包括以下五个任务。 在任务1中，将优化未延伸和僵硬的管状组件的簇的能量耗散特性，相对于其较大的边界条件，半径与壁厚度比以及其应变和应变率的特性，将优化。 任务2涉及确定导致负载的试管的初始弹性响应的重要性，从而导致弹性 - 视野反应。 在任务3中，将研究非均匀的管状塌陷模式。 任务4将研究在较大的变形条件下复合（泡沫填充）金属管的行为。 最后，任务5将概括在先前的NSF资助研究中开发的一维结构性冲击波理论，并采用它来对任务1的影响实验进行建模。这项研究将填充该影响力学领域的空隙，并提供直接适用于更有效和有效的金属能量消耗系统的结果。 当必须以受控方式消散动能的安全应用中，这种系统具有挽救生命的潜力，以使减速保持在允许的范围之内。