Issue 30

C. Putignano et alii, Frattura ed Integrità Strutturale, 30 (2014) 237-243; DOI: 10.3221/IGF-ESIS.30.30 241 Figure 3 : The dimensionless peeling force ˆ P as a function of the peeling angle at equilibrium eq  for different values of the dimensionless pre-load 0 ˆ P . The work of adhesion is 4 4 10 ˆ      . Figure 4 : The dimensionless peeling force ˆ P as a function of the peeling angle at equilibrium eq  when the load 0 ˆ P is equal to the critical pre-load 0 ˆ 2 ˆ cr P    . Results are provided for different values of the work of adhesion: 4 1 4 ˆ 10      ; 4 3 2 3 8 10 ,   1 10 ˆ 2 ˆ .           . Now, for both the stable region and the unstable one, we plot the vertical displacement ˆ  as a function of the peeling angle at equilibrium (see Fig. 5). We observe that, when we are close to the limit peeling angle lim  , the displacement diverges: as shown in Fig. 6, with a finite load equal to ˆ lim P , we are able to completely detach the tape. Notice that, given the configurations in Fig. 1, for pre-load 0 ˆ P smaller than the critical pre load 0 ˆ cr P , the smallest load, the tape can sustain in the stable region, is that one for which the peeling angle in equilibrium is / 2  .