Issue 30

C. Putignano et alii, Frattura ed Integrità Strutturale, 30 (2014) 237-243; DOI: 10.3221/IGF-ESIS.30.30 243 Finally, we study the importance of the pre-load 0 ˆ P : this does not affect the conclusions on stability previously carried out, but has a quantitative influence on the boundary between stable and unstable regions. Furthermore, we define a critical pre-load 0 ˆ cr P : once this is overcome, spontaneous detachment can occur and, interestingly, an external load has to be applied to get the tape adhered to the substrate. R EFERENCES [1] Geim, A.K., Dubonos, S.V., Grigorieva, I.V., Novoselov, K.S, Zhukov, A.A., Shapova, S.Y., Microfabricated adhesive mimicking gecko foot-hair. Nat. Mater., 2 (2003) 461–463. [2] Autumn, K., Sitt, M., Liang, Y.A., Peattie, A.M., Hansen, W.R., Sponberg, S., Kenny, T.W., Fearing, R., Israelachvili, J.N., Full, R.J., Evidence for van der Waals adhesion in gecko setae, In: Proc. Natl. Acad. Sci. USA, 99 (2002) 12252– 12256. [3] Kendall, K., Thin-film peeling-the elastic term, J.Phys. D: Appl. Phys., 8 (1975) 1449-1452 . [4] Chen, B., Wu, P., Gao, H., Pre-tension generates strongly reversible adhesion of a spatula pad on substrate, J. R. Soc. Interface, (2009) 6. [5] Pesika, N. S., Tian, Y., Zhao, B., Rosenberg, K., Zeng, H., McGuiggan, P., Autumn, K., Israelachvili, J. N. , Peel-Zone model of tape peeling based on the gecko adhesive system, The Journal of Adhesion, 83(4) (2007) 383-401. [6] Afferrante, L., Carbone, G., Demelio, G., Pugno, N., Adhesion of elastic thin films: double peeling of tapes versus axisymmetric peeling of membranes, Tribology Letters, 52 (2013) 439-171. [7] Lepore, E., Pugno, F., Pugno, N.M., Optimal angles for maximal adhesion in living tokay geckos, The J. of Adh., 88 (2012) 820-830 . [8] Pugno, N.M., The theory of multiple peeling, Int. J. Fract., 171 (2011) 185-193.