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: 1727792
• 负责人: Jie Yin
• 金额: $ 34.58万
• 依托单位: Temple University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1727792&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，探索潜在的变形和失效机制，控制在施加机械应变的情况下极端屈曲驱动的周期性分层图案的形成和演化。屈曲不稳定性在日常生活中无处不在，从人体皮肤起皱到油漆墙上的水泡。它一直被视为设计可拉伸设备以及动态调整润湿、粘附和光学方面的各种表面形貌相关特性的通用方法。通过该项目开发的知识可以实现和推进多种表面特性控制技术，包括极其可拉伸的电子设备、多功能智能窗户、可调谐光学器件、用于伪装的可调谐结构颜色变化、集水、自清洁、光滑表面和用于抗腐蚀的绿色表面。 -生物污垢。 这项工作还将通过天普大学的荣誉计划和扩大 K-12 学生参与的女性工程探索计划，为代表性不足的群体提供丰富的研究机会。通过紧密结合的实验、计算和理论计划，这项研究将探索软基底上薄膜自发极度屈曲驱动的周期性分层的力学。实验上，将极大的预拉伸应变施加到弹性体基底上，然后在其上沉积金属或半导体薄膜。预应变将被释放，以微米级和毫米级的连续薄膜和离散带的形式生成大面积、周期性的极度分层图案。将通过实验和开裂模型来检查在极端屈曲过程中分层屈曲薄膜和带材中潜在的开裂失效。为了揭示变形机制，将开发基于能量的理论模型以及基于粘性区模型的有限元模拟，以理解和预测带应变的周期性分层屈曲型材的可调几何形状。理论模型和数值模拟都将与实验进行比较，以进行验证和修改。

项目成果

Spontaneous Periodic Delamination of Thin Films To Form Crack-Free Metal and Silicon Ribbons with High Stretchability

薄膜自发周期性分层形成具有高拉伸性的无裂纹金属和硅带

• DOI: 10.1021/acsami.7b15693
• 发表时间: 2017-12
• 期刊: ACS Applied Materials & Interfaces
• 影响因子: 9.5
• 作者: Zhang, Qiuting;Tang, Yichao;Hajfathalian, Maryam;Chen, Chunxu;Turner, Kevin T.;Dikin, Dmitriy A.;Lin, Gaojian;Yin, Jie
• 通讯作者: Yin, Jie

Spontaneous buckling-driven periodic delamination of thin films on soft substrates under large compression

大压缩下软基底上薄膜自发屈曲驱动的周期性分层

• DOI: 10.1016/j.jmps.2018.05.009
• 发表时间: 2018-09-01
• 期刊: Journal of the Mechanics and Physics of Solids
• 影响因子: 5.3
• 作者: Qiuting Zhang;Jie Yin
• 通讯作者: Jie Yin