Detachment of stretched viscoelastic fibrils |
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Authors: | N J Glassmaker C Y Hui T Yamaguchi C Creton |
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Institution: | (1) Laboratoire de Physico-Chimie des Polymères et Milieux Dispersés, UMR7615 ESPCI-CNRS-UPMC, 10 Rue Vauquelin, 75231 Paris Cédex 05, France;(2) Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY, USA |
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Abstract: | New experimental results are presented about the final stage of failure of soft viscoelastic adhesives. A microscopic view
of the detachment of the adhesive shows that after cavity growth and expansion, well adhered soft adhesives form a network
of fibrils connected to expanded contacting feet which fail via a sliding mechanism, sensitive to interfacial shear stresses
rather than by a fracture mechanism as sometimes suggested in earlier work. A mechanical model of this stretching and sliding
failure phenomenon is presented which treats the fibril as a nonlinear elastic or viscoelastic rod and the foot as an elastic
layer subject to a friction force proportional to the local displacement rate. The force on the stretched rod drives the sliding
of the foot against the substrate. The main experimental parameter controlling the failure strain and stress during the sliding
process is identified by the model as the normalized probe pull speed, which also depends on the magnitude of the friction
and PSA modulus. In addition, the material properties, viscoelasticity and finite extensibility of the polymer chains, are
shown to have an important effect on both the details of the sliding process and the ultimate failure strain and stress.
Electronic supplementary material Appendix B is only available in electronic form at
and are accessible for authorised users. |
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Keywords: | 61 41 +e Polymers elastomers and plastics 62 20 D- Elasticity 62 20 Qp Friction tribology and hardness 82 35 Gh Polymers on surfaces adhesion |
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