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（职业）计划赠款中学到的经验教训将为柔软和脆弱物质（例如颗粒状材料和组织）积极导航的框架提供框架。可以弯曲和折叠的活性材料为可部署的结构，智能针和软机器人手臂提供了高级工程机会。该奖项支持对复杂材料中细棒机制的基础研究，并将提供必要的知识，以创建能够在各种媒体中积极围绕障碍物导航的先进的自主结构。为了协助更广泛的机械师传播，该奖项通过利用在线数字媒体来向全球社区展示机械知识，通过重点关注数字灵感，交流和教育（DICE）来支持一项创新计划，以提高科学沟通和识字能力。通过强调视觉，言语和书面交流，该计划将通过开放的在线机械师内容的创建和策划和策展来增强下一代学者的科学沟通，并扩大公众的参与。通过柔软而脆弱的物质（例如组织和颗粒介质）来指导结构，需要了解细长结构的机制，刺激反应性结构的变形以及由变形结构及其周围介质之间的相互作用产生的力。该奖项将使人们更好地理解细长的结构如何在复杂的介质中变形。首先，将建立定量实验关系，以描述被动弹性条在各个周围环境中的弯曲，屈曲和界面穿透，包括干燥，湿，软颗粒物和水凝胶。对于每种介质，这将提供对将结构弯曲到特定曲率所需的刺激的大小。然后将刺激响应的微观结构掺入弹性条中，从而使其能够响应气动压力而弯曲和卷曲。这项工作的实验结果将为重要的理论研究提供基础，这些研究将毛弹性，颗粒状干扰和细长结构的力学促进，同时激发了先进的刺激，刺激性反应性结构。该奖项的结果将有助于预测复杂媒体中细长结构的变形和屈曲，同时为设计可以在软且脆弱的物质内积极弯曲的结构提供一般框架。