Mechanics of Extreme Mechanical Instabilities via Spontaneously Periodic Delamination

自发周期性分层导致极端机械不稳定性的力学

• 批准号: 2010717
• 负责人: Jie Yin
• 金额: $ 34.58万
• 依托单位: North Carolina State 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: 2019-09-01 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2010717&HistoricalAwards=false
• 关键词: Mechanics; Extreme; Mechanical; Instabilities; via

This award supports fundamental research exploring the underlying deformation and failure mechanism governing the formation and evolution of extremely buckling driven periodic delaminated patterns with the applied mechanical strain. Buckling instability is ubiquitous in daily lives from human skin wrinkling to blisters on painted walls. It has been pursued as a versatile means to design stretchable devices, as well as dynamically tuning a variety of surface topography related properties in wetting, adhesion, and optics. The knowledge developed through this project could enable and advance multiple surface properties governed technologies, including extremely stretchable electronics, multifunctional smart windows, tunable optics, tunable structural color change for camouflage, water harvesting, self-cleaning, slippery surface, and green surfaces for anti-biofouling. This work will also provide rich research opportunities for underrepresented groups through the honor program at Temple University and the Women Engineering Exploration program broadening participation for K-12 students.Through combining a tightly coupled experimental, computational, and theoretical program, this research will explore the mechanics of spontaneously extremely buckling driven periodic delamination of thin film on soft substrates. Experimentally, extremely large pre-stretched strain will be applied to an elastomer substrate, followed by the deposition of metal or semiconductor thin films on it. The pre-strain will be released to generate large-area, periodic extremely delaminated patterns in the form of continuous thin film and discrete ribbons on both microscale and millimeter-scale. The potential cracking failure in the delaminated buckled film and ribbons during the extreme buckling will be examined through experiments and cracking models. To reveal the deformation mechanism, energy-based theoretical modeling, together with cohesive zone modeling based finite element simulation, will be developed to understand and predict the tunable geometry of periodic delaminated buckled profiles with strains. Both the theoretical modeling and numerical simulations will be compared with experiments for validation and modifications.

该奖项支持基础研究，探讨了使用应用机械菌株的极端屈曲驱动的周期性分层模式的形成和演变的潜在变形和故障机制。屈曲不稳定在日常生活中无处不在，从人类的皮肤皱纹到彩绘墙上的水泡。它已被作为设计可拉伸设备的多功能手段，并动态调整了润湿，粘附和光学方面的各种表面地形相关的特性。通过该项目开发的知识可以实现和推进多种表面特性，包括极其可拉伸的电子设备，多功能智能窗口，可调光学元件，可调式伪装的可调结构颜色变化，收获水，自我清洁，滑水表面和绿色表面，用于抗生物燃料。 这项工作还将通过Temple University的荣誉计划和妇女工程探索计划扩大K-12学生的参与的荣誉计划为代表性不足的群体提供丰富的研究机会。通过结合一个紧密耦合的实验，计算和理论计划，该研究将探索薄膜对软胶片上薄膜的屈曲式定期差异的机制。在实验上，将非常大的预扎菌株应用于弹性体底物，然后在其上进行金属或半导体薄膜的沉积。该预算将被释放，以在微观和毫米级上以连续的薄膜和离散丝带的形式生成大区域的周期性分层图案。在极端屈曲期间，将通过实验和破裂模型检查在极端屈曲期间的分层屈曲膜和丝带的潜在破裂失败。为了揭示变形机制，将开发基于能量的理论建模以及基于粘性区域建模的有限元仿真，以理解和预测具有应变的周期性分层扣除轮廓的可调几何形状。理论建模和数值模拟都将与实验进行验证和修改进行比较。

项目成果

Leveraging elastic instabilities for amplified performance: Spine-inspired high-speed and high-force soft robots

• DOI: 10.1126/sciadv.aaz6912
• 发表时间: 2020-05-01
• 期刊: SCIENCE ADVANCES
• 影响因子: 13.6
• 作者: Tang, Yichao;Chi, Yinding;Yin, Jie
• 通讯作者: Yin, Jie