Spontaneous peeling

The internal stresses can be equated to a long-period acting load [161]. They can cause spontaneous peel-off of the polymer and fracture of the adhesive-bonded joint [160—163], even at 15—50% of the instantaneous breaking stress. In this csise there is a linear dependence in semi-log coordinates between the lifetime of the joint and the internal stresses [164]. An analytical dependence has been proposed that relates the strength of the adhesive-bonded joint to the internal stresses in the adhesive layer [160],... 

Interfacial work of adhesion, y, can be measured by spontaneous peeling test using above equation. Spontaneous peeling thickness, tp, can be directly measured, and the recoverable strain energy, Ur, for an elastic material under a one-dimensional strain is. 

Such spontaneous peeling has been studied by Barquins, ) who placed a rubber strip on a second rubber strip which is stretched. The energy release rate is... 

The surface forces, of van der Waals type for rubber-like materials, are able to grandly modify the stress tensor provided by the contact of a blunt asperity applied against the flat and smooth surface of a rubber sample. It will be shown how the coupling of surface adhesion properties and bulk viscoelastic behavior of rubber-like material allows us to solve adherence problems. This will be illustrated through three examples the spontaneous peeling due to the intervention of internal stresses the no-rebound of balls on the smooth surfoce of a soft elastomer and the adhesive contact and rolling of a rigid cylinder under a smooth-surfaced sheet of rubber. 

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