Kim Tae Wan, Bhushan Bharat
Nanotribology Laboratory for Information Storage and MEMS/NEMS, The Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210-1142, USA.
Ultramicroscopy. 2007 Oct;107(10-11):902-12. doi: 10.1016/j.ultramic.2006.11.008. Epub 2007 Apr 27.
Geckos are known for their remarkable ability to cling on and detach from ceilings and walls using a unique attachment system. Their foot pads are covered by a large number of small hair (setae) that contain many branches per seta with a lower level of spatulae. This hierarchical structure gives the gecko adaptability to create a large real area of contact with rough surfaces. In this study, using the three-level hierarchical model recently developed to simulate a gecko seta contacting with random rough surface, the effects of spring stiffness and number of springs on the adhesion enhancement of multi-level hierarchical model are investigated. One- and three-level hierarchically structured spring models with different spring stiffnesses and number of springs on each level in contact with various rough surfaces are considered. The efficiency of attachment-the adhesion coefficient, the adhesion force, the number of contacts and the adhesion energy-for the three-level models with different stiffness is investigated in contact with different rough surfaces.
壁虎以其利用独特附着系统在天花板和墙壁上附着和脱离的非凡能力而闻名。它们的脚垫覆盖着大量细小的毛发（刚毛），每根刚毛包含许多分支，且分支末端的扁平铲状结构较少。这种分层结构使壁虎能够适应与粗糙表面形成大面积的实际接触区域。在本研究中，使用最近开发的三级分层模型来模拟壁虎刚毛与随机粗糙表面的接触，研究了弹簧刚度和弹簧数量对多级分层模型附着力增强的影响。考虑了具有不同弹簧刚度和各级弹簧数量的一级和三级分层结构弹簧模型与各种粗糙表面的接触情况。研究了不同刚度的三级模型在与不同粗糙表面接触时的附着效率——附着系数、附着力、接触数量和附着能量。
