Numerical study of adhesion enhancement by composite fibrils with soft tip layers
Numerical study of adhesion enhancement by composite fibrils with soft tip layers
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DOI：
10.1016/j.jmps.2016.11.017
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发表时间：
2017-02-01
影响因子：
5.3
通讯作者：
Arzt, Eduard
中科院分区：
文献类型：
--
作者：
Bahjepalli, Ram Gopal;Fischer, Sarah C. L.;Arzt, Eduard
在过去的十年中，已经彻底研究了具有可逆粘附性的生物灵感纤维状表面。在本文中，我们提出了一种新的复合原纤组成的软尖层和硬茎与不同形状的界面（平与弯曲）之间。拉伸应力远程施加在原纤维的自由端上，其另一端粘附到刚性基底。在平面应变（2D）和轴对称（3D）条件下，这种结构的应力分布和由此产生的粘附进行了数值研究。针对层厚度和杨氏模量的不同组合评估应力强度。发现对于较薄的层和较大的模量比，粘附强度值增加;这些趋势也反映在选定的实验结果中。本文的研究结果为优化纤维表面的粘附强度提供了一种新的策略。
Bio-inspired fibrillar surfaces with reversible adhesion to stiff substrates have been thoroughly investigated over the last decade. In this paper we propose a novel composite fibril consisting of a soft tip layer and stiffer stalk with differently shaped interfaces (flat vs. curved) between them. A tensile stress is applied remotely on the free end of the fibril whose other end adheres to a rigid substrate. The stress distributions and the resulting adhesion of such structures were numerically investigated under plane strain (2D) and axisymmetric (3D) conditions. The stress intensities were evaluated for different combinations of layer thickness and Young's moduli. The adhesion strength values were found to increase for thinner layers and larger modulus ratio; these trends are also reflected in selected experimental results. The results of this paper provide a new strategy for optimizing adhesion strength of fibrillar surfaces.