A Configuration-Space Interrogation Approach to the Understanding and Design of Critical Load-Bearing Structures Susceptible to Buckling

用于理解和设计易受屈曲影响的关键承载结构的配置空间询问方法

基本信息

批准号：
1926672
负责人：
Lawrence Virgin
金额：
$ 37.64万
依托单位：
Duke University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-08-15 至 2023-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1926672&HistoricalAwards=false
关键词：
Configuration Space Interrogation Approach Understanding

项目摘要

Predicting the load that a structure can safely withstand before it collapses is challenging. During its useful life-time, a structure is expected to perform within an often severe, and changing environment, whether this is a solid-rocket booster during lift-off; a multi-story building during an earthquake; a grain silo during strong winds; an aircraft wing during turbulence; or an ocean submersible subject to great pressure at depth. The failure of slender cylindrical structures, in particular, is sensitively dependent on small changes in geometry, and when they do fail, usually due to buckling, it is often a sudden and catastrophic event. Due to their unpredictable behavior, they are typically over-designed. This award supports the development of an innovative approach to understanding the buckling of slender structures in general, and hollow cylindrical structures in particular. A more rational basis for assessing load-carrying capability, including appropriate safety factors, will allow more accurate predictions to be made concerning the anticipated useful lifetime of a given structure resulting in tremendous savings. This research is also important for optimizing component replacement, scheduling maintenance based on deteriorating performance, and minimizing material usage. Economic designs and the prevention of disaster are long-term benefits of the research. During the conduct of this research, graduate and undergraduate students will learn a variety of skills including structural testing, mathematical modeling, additive manufacturing, experimental design, and data analysis. Since hollow cylinders are widely used as containers, ranging from soda cans to pipelines to pressurized aircraft fuselages, this project has important impact on national defense and prosperity.Testing thin cylinders under axial load typically leads to large scatter in the measured buckling load. This has led engineers to rely on relatively conservative design guidelines based on empirical ?knockdown? factors. Rather than trying to predict the exact load at which a highly nonlinear structure will buckle, the major goal of the new approach is to assess the robustness of a structure to shocks or disturbances: a form of configuration-space interrogation. The identification of unstable equilibrium states, and their avoidance, is a key feature of the new stability criteria. 3D-printing will be used extensively. The geometric precision and versatility of 3D-printing is ideally suited to producing a range of high-resolution cylinders that will be thoroughly tested in the laboratory. Numerical simulations will also be conducted for verification purposes. The fundamental knowledge gained in this research will provide an important contribution to the understanding of structural stability and ultimately guide the design and use of critical load-bearing elements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

预测结构在崩溃之前可以安全承受的负载具有挑战性。在其使用寿命期间，预计结构将在经常严重且不断变化的环境中执行，无论这是在提升过程中的固体助推器；地震期间的多层建筑；在强风中有谷物筒仓；湍流期间的飞机翼；或可在深度压力的海洋潜水。尤其是细长的圆柱结构的失败，敏感地取决于几何形状的小变化，当它们确实失败时，通常是由于屈曲，这通常是突然而灾难性的事件。由于其不可预测的行为，它们通常是过度设计的。该奖项支持了一种创新方法的发展，以理解一般而言，尤其是空心的圆柱结构的屈曲。评估负载能力（包括适当的安全因素）的更合理的基础将允许对给定结构的预期有用寿命做出更准确的预测，从而获得巨大的节省。这项研究对于优化组件更换，基于性能恶化以及最小化材料使用情况的维护也很重要。经济设计和预防灾难是研究的长期利益。在这项研究的进行期间，研究生和本科生将学习各种技能，包括结构性测试，数学建模，增材制造，实验设计和数据分析。由于空心圆柱体被广泛用作容器，从苏打水到管道到加压飞机机身，该项目对国防和繁荣具有重要影响。测试轴向负载下的薄缸通常会导致测得的屈曲负载中的大量散射。这导致工程师依靠基于经验？敲低的相对保守的设计指南？因素。新方法的主要目标不是试图预测高度非线性结构将扣紧的确切载荷，而是要评估结构对冲击或干扰的稳健性：一种构型空间询问的形式。识别不稳定的平衡状态及其回避是新稳定标准的关键特征。 3D打印将广泛使用。 3D打印的几何精度和多功能性非常适合生产一系列高分辨率圆柱体，这些缸将在实验室中进行彻底测试。还将进行数值模拟以进行验证。这项研究中获得的基本知识将为理解结构稳定性做出重要贡献，并最终指导关键负荷元素的设计和使用。该奖项反映了NSF的法定任务，并认为值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来进行评估。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Experiments on Probing the Configuration Space of Post-Buckled Panels

DOI：
10.1115/1.4048197
发表时间：
2020-12
期刊：
Journal of Applied Mechanics
影响因子：
0
作者：
David A. Ehrhardt;L. Virgin;S. Spottswood
通讯作者：
David A. Ehrhardt;L. Virgin;S. Spottswood

Comparative structural stiffness: Exploiting 3D-printing

比较结构刚度：利用 3D 打印

DOI：
10.1119/10.0001756
发表时间：
2020
期刊：
American Journal of Physics
影响因子：
0.9
作者：
Virgin, Lawrence N.
通讯作者：
Virgin, Lawrence N.

3D-printing and cylinder buckling: challenges and opportunities

DOI：
10.1098/rsta.2022.0035
发表时间：
2023-04-03
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
影响因子：
5
作者：
Cooley, S. A.;Yang, H.;Virgin, L. N.
通讯作者：
Virgin, L. N.

On the elastic snapping of structural elements