Postbuckling Behavior of Axially-Compressed Strips With Discrete Rigid Constraints: A Numerical Study
Postbuckling Behavior of Axially-Compressed Strips With Discrete Rigid Constraints: A Numerical Study
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具有离散刚性约束的轴向压缩条带的后屈曲行为：数值研究
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Burgueño
中科院分区：
文献类型：
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作者：
Suihan Liu;N. Hu;R. Burgueño
双向连续刚性约束（CRC）的轴向受压柱或条带在弹性后屈曲响应中会发生多次突变屈曲，导致系统应变能的突然释放。这一特性使该结构原型可用作智能应用的能量集中器。然而，控制此类系统后屈曲响应的参数是有限的。本文讨论的结构原型是一个轴向压缩带离散刚性约束（DRC），从而横向约束的布局提供了更大的设计自由度，以控制带的后屈曲功能。这项研究是基于使用有限元法的数值模拟。使用先前表征的CRC条带作为基线，两个DRC设计组被考虑在对称和非对称布局中，总共15种不同的布置。结果表明，DRC条带可以获得具有明显特征的弹性后屈曲响应，并且可以通过改变约束的数量和位置来控制远后屈曲响应。与CRC条带相比，一些DRC图案允许在第一屈曲事件之后获得更高的模式转变和更大的动能释放。设计这种后屈曲响应特性的能力可以潜在地用于能量收集和其他传感和驱动应用。Copyright © 2015 by ASME
Axially-compressed columns, or strips, with bilateral continuous rigid constraints (CRC) are known to be able to attain multiple snap-through buckling events in their elastic postbuckling response that lead to the sudden release of strain energy from the system. This feature allows this structural prototype to be used as energy concentrators for smart applications. However, the parameters controlling the postbuckling response for such system are limited. The structural prototype discussed in this paper is that of an axially compressed strip provided with discrete rigid constraints (DRC), whereby the layout of the lateral constrains provides increased design freedom to control the strip’s postbuckling features. The study is based on numerical simulations using the finite element method. Using a previously characterized CRC strip as a baseline, two DRC design groups were considered in symmetric and asymmetric layouts for a total of 15 different arrangements. Results show that DRC strips can attain elastic postbuckling responses with distinct characteristics and that the far postbuckling response can be controlled by modifying the number and the location of the constraints. Compared to CRC strips, some DRC patterns allow attaining higher mode transitions and larger kinetic energy release after the first buckling event. The ability to design for such postbuckling response features can be potentially used for energy harvesting and other sensing and actuation applications.Copyright © 2015 by ASME