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Journal of Intelligent Material Systems and Structures
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Adhesion Characteristics of Polyurethane for Bionic Hairy Foot

Zhendong Dai

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics Nanjing, China, 210016, zddai{at}nuaa.edu.cn

Min Yu

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics Nanjing, China, 210016

Stanislav Gorb

Evolutionary Biomaterials Group, Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3D-70569 Stuttgart, Germany

Hairy adhesive pads are used by many animals and insects which can move on the ceilings and walls, such as gecko, spider, fly and some beetles. The effects of material properties and contact geometry were experimentally studied. The softest material has the highest adhesion and the surface roughness has hardly any effects on adhesion. The contact geometry and surface roughness influence adhesion heavily. The adhesion increases with the increase of normal force for a flat-to-flat contact, but does not get affected for a spherical sapphire ball to flat polyurethane contact. The adhesion is not affected by contact angles for soft connections, but heavily decreases for hard connections. The results are important data for bionic hairy foot design.

Key Words: adhesion • bionic • gecko • polyurethane • surface roughness

This version was published on September 1, 2006

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 8-9, 737-741 (2006)
DOI: 10.1177/1045389X06055829
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