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Journal of Intelligent Material Systems and Structures
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Effect of Microscale Contact State of Polyurethane Surface on Adhesion and Friction

Min Yu

Institute of Bio-inspired Structure and Surface Engineering The Academy of Frontier Sciences, Nanjing University of Aeronautics and Astronautics 29 Yudao Street, Nanjing 210016, China

Aihong Ji

Institute of Bio-inspired Structure and Surface Engineering The Academy of Frontier Sciences, Nanjing University of Aeronautics and Astronautics 29 Yudao Street, Nanjing 210016, China

Zhendong Dai

Institute of Bio-inspired Structure and Surface Engineering The Academy of Frontier Sciences, Nanjing University of Aeronautics and Astronautics 29 Yudao Street, Nanjing 210016, China, zddai{at}nuaa.edu.cn

The effect of microscale contact of rough surfaces on adhesion and friction under negative normal forces is experimentally investigated. The adhesion do not vary with the normal forces on the condition of single point contact - sapphire ball to flat polyurethane (PU). The adhesion increased with the normal forces according to logarithmic relation in the circumstances of rough surface contact, which was assumed as a great number of point contacts. Under negative normal forces - adhesion, the tangential forces increased with the decrease of negative normal forces linearly. The results reveal why a gecko’s toe must slide slightly on the target surface when it contacted the ceiling and suggest how the biomimetic gecko foot is designed.

Key Words: polyurethane • adhesion • friction

This version was published on September 1, 2006

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 8-9, 819-822 (2006)
DOI: 10.1177/1045389X06057536
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