CAREER: Rigidity tuned elastomer origami tessellations for fast, reconfigurable, and soft mechanoreceptors

职业：刚性调整的弹性体折纸镶嵌，用于快速、可重构和柔软的机械感受器

• 批准号: 1846954
• 负责人: Kristen Dorsey
• 金额: $ 50.04万
• 依托单位: Smith College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-02-15 至 2022-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1846954&HistoricalAwards=false
• 关键词: CAREER; Rigidity; tuned; elastomer; origami

Mechanical deformation sensors made from rubber, fabric, and other soft materials are poised to unobtrusively measure human motion, which will lead to human-machine interfaces, human-robot cooperation, active prostheses, and assistive devices for people with limited mobility or dexterity. In these applications, complex motions such as bending, twisting, and straining are present. Most soft sensor designs respond similarly to these deformations, which limits their accuracy if more than one deformation occurs. Origami patterns, which have unique mechanical properties that cannot be achieved in flat materials, are promising solutions for more accurately measuring complex deformations. The goal of this work is to measure how stretchable and soft origami behaves and to study whether soft, origami-patterned sensors can distinguish pressure, strain, and curvature to realize a new class of soft deformation sensors. Soft, origami-patterned sensors will be modeled and fabricated. Their mechanical properties and sensing performance will be characterized. Female undergraduate engineering students at a women's college will participate in carrying out this research through summer and semester-long research opportunities. In conjunction with the research objectives, this project will encourage middle school students and teachers to learn about flexible sensors through a series of workshops. The research goal of this project is to investigate whether soft material origami demonstrates mechanical properties that are advantageous for selective or multimodal strain, pressure, and curvature sensors. Silicone elastomers are flexible and compliant, which makes them excellent materials for use in soft sensing applications. Flat elastomer sensors, however, have non-specific responses to curvature, strain, pressure, and force. Changing the sensor morphology to bias the response towards one deformation may decouple these deformations while preserving the elastomer's advantageous properties. Origami and kirigami patterns are a promising approach to decoupling deformations and increasing mechanical selectivity. By modifying the pattern and fold angle or cut angle, origami and kirigami tessellations can tune the material's Poisson's ratio and stiffness. The project has three research objectives: 1) to model and characterize origami-patterned silicone elastomers under mechanical deformations, 2) to combine patterns that successfully decouple deformations with soft sensing modalities (e.g., resistive, capacitive), and 3) to fabricate origami patterned sensors with variable stiffness folds to demonstrate reconfigurable, high-dynamic range sensors. This investigation will increase fundamental understanding of the mechanical properties of origami-patterned silicone elastomers. The fabrication work will also yield new knowledge about generating such patterns in silicone elastomers and techniques to integrate mechanical sensing modalities into soft, three-dimensional structures.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.

由橡胶，织物和其他软材料制成的机械变形传感器有望不显眼地测量人类运动，这将导致人机界面，人机合作，主动假体和辅助设备，适用于有限的活动性或敏捷性。在这些应用中，存在复杂的运动，例如弯曲，扭曲和紧张。大多数软传感器设计对这些变形的响应类似，如果发生多个变形，则限制了它们的准确性。具有独特的机械性能在扁平材料中无法实现的折纸图案是有希望的解决方案，可更准确地测量复杂的变形。这项工作的目的是测量可拉伸和软折纸的行为，并研究柔软的，折纸图案的传感器是否可以区分压力，应变和曲率，以实现一类新的软变形传感器。柔软的折纸图案传感器将被建模和制造。它们的机械性能和传感性能将被表征。女性学院的女性大学生大学生将在夏季和学期的研究机会中进行这项研究。结合研究目标，该项目将鼓励中学生和老师通过一系列研讨会来了解灵活的传感器。该项目的研究目的是研究软材料折纸是否证明机械性能对于选择性或多模式应变，压力和曲率传感器是有利的。有机硅弹性体具有柔性和合规性，这使它们成为用于软感应应用中的绝佳材料。但是，平面弹性体传感器对曲率，应变，压力和力具有非特异性响应。更改传感器形态以偏向对一个变形的响应，可能会使这些变形分离，同时保留弹性体的优势性能。折纸和基里加米模式是将变形和提高机械选择性脱钩的一种有希望的方法。通过修改图案和折叠角或切角，折纸和基里加米镶嵌可以调节材料的泊松比和刚度。该项目具有三个研究目标：1）在机械变形下建模和表征折纸图案的硅胶弹性体，2）结合模式，将成功将变形与软感应模态解释为柔软的传感模式（例如电阻，电容性，3），而将折叠式传感器与可变的僵硬折叠式构造，以表现出可变性的折叠率，以表现出可变的折叠率，以表现出可变的较高的折叠。这项研究将增加对折纸图案硅胶弹性体机械性能的基本理解。制造工作还将产生有关在硅酮弹性体和技术中产生此类模式的新知识，以将机械感应方式整合到柔软的三维结构中。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估来通过评估来获得支持的。

项目成果

Lifetime of Liquid Metal Wires for Stretchable Devices

• DOI: 10.1002/admt.202001100
• 发表时间: 2021-02
• 期刊: Advanced Materials Technologies
• 影响因子: 6.8
• 作者: K. Dorsey;N. Lazarus