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Three-level hierarchal modeling of gecko toe adhesion

Published online by Cambridge University Press:  15 March 2011

B. Chen ,
P. D. Wu  and
H. Gao
B. Chen*
Affiliation:
Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada
P. D. Wu
Affiliation:
Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, L8S 4L7, Canada
H. Gao
Affiliation:
Division of Engineering, Brown University, Providence, RI, 02912, USA
*
Corresponding author: Tel.: (905) 525-9140 EXT. 27329; Email address: [email protected]
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Abstract

The underlying mechanisms of gecko adhesion have been investigated through modeling of the three-level hierarchical microstructures under gecko's toe [1]. At the bottom of hierarchy, we show that the peeling strength of a spatula pad for attachment can be 10 times larger than that for detachment. At the intermediate level of hierarchy, we show that the 10 times difference in the peeling strength of a spatula pad for attachment and detachment leads to a 100 times difference in adhesion energy at the level of seta. At the top of hierarchy, the attachment of a gecko toe is modeled as a pad under displacement controlled pulling, which yields an adhesive strength more than sufficient for gecko's body weight; On the other hand, the detachment is modeled as a pad under peeling, giving rise to a negligible peel-off force. The present study reveals that the hierarchical microstructures play critical roles in providing gecko with robust attachment and easy detachment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1132: Symposium Z – Mechanics of Biological and Biomedical Materials , 2008 , 1132-Z07-22
Copyright
Copyright © Materials Research Society 2009

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References

REFERENCES

1. Chen, B., Wu, P.D., and Gao, H., 2008 Hierarchical modelling of attachment and detachment mechanisms of gecko toe adhesion. Proc. R. Soc. A. 464: 1639–1652.Google Scholar
2. Autumn, K., Liang, Y.A., Hsieh, S.T., Zesch, W., Chan, W.P., Kenny, T.W., Fearing, R., and Full, R.J., 2000 Adhesive force of a single gecko foot-hair. Nature 405, 681–685.Google Scholar
3. Autumn, K., Sitti, M., Liang, Y.A., Peattie, A.M., Hansen, W.R., Sponberg, S., Kenny, T.W., Fearing, R., Israelachvili, J.N., and Full, R.J., 2002 Evidence for van der Waals adhesion in gecko seta. Proc. Natl. Acad. Sci. USA 99, 12252–12256.Google Scholar
4. Tian, Y., Pesika, N., Zeng, H., Rosenberg, K., Zhao, B., McGuiggan, P., Autumn, K. and Israelachvili, J., 2006 Adhesion and friction in gecko toe attachment and detachment. Proc. Natl. Acad. Sci. USA. 103, 19320–19325.Google Scholar
5. Yao, H., and Gao, H., 2006 Mechanics of robust and releasable adhesion in biology: Bottom-up designed hierarchical structure of gecko. J. Mech. Phys. Solids. 54, 1120–1146.Google Scholar
6. Kendall, K., 1975 Thin-film peeling-elastic term. J. Phys. D: Appl. Phys. 8, 1449–1452.Google Scholar
7. Huber, G., Gorb, S., Spolenak, R., and Arzt, E., 2005 Resolving the nanoscale adhesion of individual gecko spatulae by atomic force microscopy. Biol Lett 1: 2–4.Google Scholar
8. Gao, H., Wang, X., Yao, H., Gorb, S., and Arzt, E., 2005 Mechanics of hierarchical adhesion structures of geckos. Mech. Mater. 37, 275–285.Google Scholar
9. Hui, C.Y., Glassmaker, N.J., Tang, T., and Jagota, A., 2004 Design of biomimetic fibrillar interface: 2. Mechanics of enhanced adhesion. J. R. Soc. Interface. 1, 35–48.Google Scholar
10. Gao, H.J., and Yao, H.M., 2004 Shape insensitive optimal adhssion of nanoscale fibrillar structures. Proc. Natl. Acad. Sci. USA 101(21): 7851–7856.Google Scholar
11. Tada, H., Paris, P. C., and Irwin, G. R. 2000 The stress analysis of cracks handbook. ASME press, New York.Google Scholar
12. Irschick, D.J., Austin, C.C., Retren, K., Fisher, R., Losos, J.B., and Ellers, O., 1996 A comparative analysis of clinging ability among pad-bearing lizards. Biol. J. Linn. Soc. 59, 21–35.Google Scholar
13. Bhushan, B., 2007 Adhesion of multi-level hierarchical attachment systems in gecko feet. J. Adhesion Sci. Technol. 21, 1–13.Google Scholar
14. Autumn, K., Majidi, C., Groff, R.E., Dittmore, A., and Fearing, R., 2006 Effective elastic modulus of isolated gecko setal arrays. Journal of Experimental Biology. 209, 3558–3568.Google Scholar