Understanding the Dynamics of Periodic Planar Microstructures Responding to Colliding Micro-Particles

了解周期性平面微结构响应碰撞微粒的动力学

• 批准号: 2318110
• 负责人: Jae-Hwang Lee
• 金额: $ 51.7万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2318110&HistoricalAwards=false
• 关键词: Understanding; Dynamics; Periodic; Planar; Microstructures

Speeding airborne particles often result in severe physical erosion damage in aircraft, for example damage to jet engine turbine blades caused by ice or sand particles. This award supports research to understand the mechanics of collisions of high-speed particles on surfaces. Controlled collisions of rigid microparticles against surfaces with precisely manufactured microstructures will be conducted at various speeds and angles. Energy exchanges between the speeding particles and the periodic structures will be observed with ultrafast imaging. The mechanical interaction characteristics varying with the particle’s energy and momentum will extend the scope of traditional spectroscopy to mechanics. Modeling the ordered surface structures as planar metamaterials wil further contribute to the fundamental understanding of these interactions. The impact of this research has the potential to facilitate the development of novel industrial processes, such as particle sorting and selection, in industrial and public health sectors.Implementing functional microscopic textures in soft materials has shown exceptional adhesion and friction properties, as evidenced by the gripping abilities of Gecko feet and bio-inspired synthetic adhesives. This ballistic mechanical metamaterials study will extend the scope of tribological characteristics of microstructured surfaces from the quasi-static (sub-second regime) to the high-strain rate (sub-microsecond regime). Furthermore, the researched mechanical metamaterials based on rationally designed planar viscoelastic microstructures, which serve as a collection of viscoelastic resonators, are expected to demonstrate various unexplored nonlinear dynamic phenomena, such as energy absorption resonance, anti-Stokes scattering, and geometrical quantization in the mechanical system. This research project will advance the fundamental understanding of how mechanical metasurfaces dynamically create interfacial responses originating from viscoelasticity, geometrical phase transformation, and the evolution of microstructural adhesion. Ultimately, the researched mechanical metamaterials capable of manipulating the scattering cross-section of the incoming microparticles will extend the knowledge of the transient rheological and tribological behaviors of deformable solid materials and structures when subjected to ultrahigh-strain-rate mechanical stimuli.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.

加速的空气颗粒通常会对飞机造成严重的物理侵蚀损坏，例如冰或沙子颗粒对喷气发动机涡轮机叶片造成的损坏。该奖项支持研究，以了解高速粒子在表面上的碰撞机制。刚性微粒与具有精确制造的微结构的表面的受控碰撞将以各种速度和角度进行。超快成像将观察到高速粒子和周期性结构之间的能量交换。随着粒子能量和动量的变化而变化的力学相互作用特性将把传统光谱学的研究范围扩展到力学领域。将有序表面结构模拟为平面超材料将进一步有助于对这些相互作用的基本理解。这项研究的影响有可能促进工业和公共卫生领域的新型工业流程的发展，例如颗粒分选和选择。在软材料中实现功能性微观纹理显示出卓越的粘附和摩擦性能，壁虎脚和生物灵感合成粘合剂的抓地力就证明了这一点。这种弹道机械超材料的研究将扩大微结构表面的摩擦学特性的范围从准静态（亚秒政权）的高应变率（亚微秒政权）。此外，所研究的机械超材料的基础上合理设计的平面粘弹性微结构，作为一个集合的粘弹性谐振器，预计将展示各种未探索的非线性动力学现象，如能量吸收共振，反斯托克斯散射，和几何量子化的机械系统。该研究项目将推进对机械超颖表面如何动态地产生源于粘弹性、几何相变和微观结构粘附演变的界面响应的基本理解。最后，所研究的能够操纵进入的微粒的散射截面的机械超材料将扩展可变形固体材料和结构在经受超高应变时的瞬态流变学和摩擦学行为的知识，该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响进行评估，被认为值得支持审查标准。