摘要
自然界中大量结构在卷曲变形时与外界环境产生动态黏附的相互作用,展现出与静态黏附不同的力学响应与现象.本研究以一种速度可调的自然弯曲体为基础,通过高速摄影实验深入分析了不同自然曲率的自然弯曲体在薄层黏附基底上高速运动的力学特性.结果表明,随着运动速度增加(>1 m/s),黏附表面剥离强度减小.基于上述实验现象,本研究建立了自然弯曲体在黏附基底上定向高速运动的理论模型,采用匹配渐近展开法,并结合打靶法建立了基底动态黏附性能、自然弯曲体运动前沿速度以及自然曲率的联系,成功实现了对自然弯曲体高速运动的调控,揭示了软材料动态黏附性能与界面脱黏速度的关系.受汽车减速带的设计启发,制备了黏附-非黏附模式的基底,发现该模式基底存在黏附基底占比的临界特征尺寸,使得其与全黏附基底表现出相近的减速效果.这一研究为深入理解软材料动态黏附性能与开发新型黏附结构提供了力学基础.
Many structures in nature that undergo curling deformation engage in dynamic adhesive interactions with the externalenvironment. These dynamic behaviors typically occur in high-viscosity environments, where the dynamic adhesivebehavior at interfaces can modulate the bending deformation, reducing its propagation speed and, in some cases, preventingbending deformation. For instance, red blood cells undergo pore formation and exhibit membrane bending during malariainfection. Dynamic adhesion in motion manifests mechanical responses and phenomena that differ from static adhesion.However, traditional adhesion measurements, including peel tests and probe tests, are performed under near-staticconditions, and it is challenging to extrapolate them to high-speed scenarios (exceeding 1 m/s). In addition, most modelsfor dynamic bending deformations neglect the influence of adhesive boundaries, failing to describe how adhesive forcesfrom the external environment affect the curling motion. Therefore, studying how a natural bender, under adhesiveconditions, can regulate its speed during high-velocity bending is of great interest.To gain a deeper understanding of the mechanics of dynamic adhesion, this paper examines the behavior of a naturallybending body with adjustable speed rolling on a thin-film adhesive substrate. Our research uncovers the correlationbetween the dynamic adhesive properties of soft materials and the debonding velocity at the leading edge of motion. Firstly,high-speed photography is utilized to experimentally investigate the motion characteristics of samples with varying naturalcurvatures on the adhesive substrate. Our results demonstrate that a stable and self-similar structure is observed duringmotion, and the velocity of natural benders on the adhesive substrate is consistently lower than on a non-adhesive substrate.Additionally, we have developed a theoretical analysis using matched asymptotic expansions and self-similar solutions todescribe the long-term motion of natural benders. We have established a
作者
周罗慧
魏泽峰
宋恒旭
郭早阳
梁旭东
Luohui Zhou;Zefeng Wei;Hengxu Song;Zaoyang Guo;Xudong Liang(School of Science,Harbin Institute of Technology,Shenzhen 518055,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2024年第23期3443-3453,共11页
Chinese Science Bulletin
基金
国家自然科学基金(12322207)
中央高校基本科研业务费专项资金(HIT.OCEF.2022037)
非线性力学国家重点实验室开放基金资助。
关键词
动态黏附
自相似解
匹配渐近展开法
卷曲运动
黏附强度
dynamic adhesion
self-similar solution
matched asymptotic expansion method
curling motion
adhesion strength
