CAREER: Understanding and Controlling the Deformation of Thin Rods within Soft and Fragile Matter

职业：理解和控制软脆物质内细棒的变形

• 批准号: 1454153
• 负责人: Douglas Holmes
• 金额: $ 50万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-02-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454153&HistoricalAwards=false
• 关键词: CAREER; Understanding; Controlling; Deformation; Thin

The lessons learned from this Faculty Early Career Development (CAREER) Program grant will provide the framework for the active navigation of thin rods within soft and fragile matter, such as granular materials and tissue. Active materials that can bend and fold on command provide advanced engineering opportunities for deployable structures, smart needles, and soft robotic arms. This award supports fundamental research on the mechanics of thin rods in complex materials, and will provide the knowledge necessary to create advanced, autonomous structures capable of actively navigating around obstacles in various media. To assist in the broader dissemination of mechanics, this award supports the development of an innovative program to improve scientific communication and literacy by utilizing online digital media to showcase mechanics knowledge to the global community by focusing on Digital Inspiration, Communication, and Education (DICE). By placing an emphasis on visual, verbal, and written communication, this program will enhance both the scientific communication of the next generation of scholars and broaden participation of the general public through the creation and curation of open, online mechanics content. Steering a structure through soft and fragile matter, such as tissues and granular media, requires understanding the mechanics of slender structures, the deformation of stimuli-responsive structures and the forces that arise from the interplay between the deforming structure and its surrounding media. This award will lead to a better understanding of how a slender structure deforms within a complex medium. First, a quantitative experimental relationship will be developed to describe the bending, buckling, and interfacial penetration of a passive elastic strip within various surroundings, including dry, wet, and soft granular matter and hydrogels. For each medium, this will provide an understanding of the magnitude of stimulus required to bend a structure to a specific curvature. Stimuli-responsive microstructures will then be incorporated into the elastic strip, enabling it to bend and curl in response to pneumatic pressure. The experimental results from this work will provide the basis for important theoretical studies that couple poroelasticity, granular jamming, and the mechanics of slender structures while inspiring advanced, stimuli-responsive structures. The results of this award will help predict the deformation and buckling of slender structures within complex media, while providing a general framework for designing structures that can actively and controllably bend within soft and fragile matter.

从这个教师早期职业发展（CAREER）计划补助金中吸取的教训将为软质和易碎物质（如颗粒材料和组织）中的细棒的主动导航提供框架。可以根据命令弯曲和折叠的活性材料为可展开结构、智能针和软机器人臂提供了先进的工程机会。该奖项支持对复杂材料中细杆力学的基础研究，并将提供必要的知识，以创建能够在各种介质中主动绕过障碍物的先进自主结构。为了帮助更广泛地传播力学，该奖项支持开发一项创新计划，通过利用在线数字媒体向全球社区展示力学知识，重点关注数字灵感，交流和教育（DICE），以提高科学交流和素养。通过强调视觉，口头和书面交流，该计划将通过创建和管理开放的在线力学内容，加强下一代学者的科学交流，并扩大公众的参与。通过柔软和脆弱的物质，如组织和颗粒介质，引导结构，需要了解细长结构的力学，刺激响应结构的变形和变形结构与其周围介质之间的相互作用所产生的力。该奖项将导致更好地了解细长结构如何在复杂介质中变形。首先，将开发一个定量的实验关系来描述弯曲，屈曲，和界面渗透的被动弹性带在各种环境中，包括干，湿，软颗粒物质和水凝胶。对于每种介质，这将提供对使结构弯曲到特定曲率所需的刺激的大小的理解。然后将刺激响应微结构结合到弹性条中，使其能够响应于气动压力而弯曲和卷曲。这项工作的实验结果将提供重要的理论研究，耦合孔隙弹性，颗粒堵塞，细长结构的力学，同时激励先进的，刺激响应结构的基础。该奖项的结果将有助于预测复杂介质中细长结构的变形和屈曲，同时为设计能够在柔软和易碎物质中主动可控地弯曲的结构提供一个总体框架。