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Kinetics of the spontaneous peeling of elastomers

✍ Scribed by Michel Barquins

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
837 KB
Volume
29
Category
Article
ISSN
0021-8995

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✦ Synopsis

The spontaneous delamination of an elastomer strip in contact on a deformable substrate is studied. Theoretically, the system is analysed in terms of the energy balance theory of fracture by the general equation G -w = w -cP(u 0 . u), proposed by Maugis and Barquins in 1978, in which G is the strain energy release rate, w the Dupre's energy of adhesion, and 0 a dissipation function characteristic of the viscoelastic material and of the propagation in mode I, only depending on the temperature through the WLF shift factor u,and on the crack propagation speed u. It is shown that the knowledge of the function cP, which represents viscoelastic losses localized at the crack tip, allows one to predict the kinetics of the spontaneous peeling and the force applied to the system. Experiments realized with two polyurethane strips in adhesive contact, one strip used as substrate being submitted to instantaneous or increasing tensile elongations, verify theoretical predictions with a reproducibility better than 3%.

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