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The problem of the detachment of a sufficiently large flat indenter from aplane adhesive viscoelastic strip of thickness "b" is studied. For any givenretraction speed, three different detachment regimes are found: (i) for verysmall "b" the detachment stress is constant and equal to the theoreticalstrength of the interface, (ii) for intermediate values of "b" the detachmentstress decays approximately as b^(-1/2), (iii) for thick layers a constantdetachment stress is obtained corresponding to case the punch is detaching froma halfplane. By using the boundary element method a comprehensive numericalstudy is performed which assumes a linear viscoelastic material with a singlerelaxation time and a Lennard-Jones force-separation law. Pull-off stress isfound to consistently and monotonically increase with unloading rate, but to bealmost insensitive to the history of the contact. Due to viscoelasticity,unloading at high enough retraction velocity may allow punches of macroscopicsize to reach the theoretical strength of the interface. Finally, a correctiveterm in Greenwood or Persson theories considering finite size effects isproposed. Theoretical and numerical results are found in very good agreement.

Viscoelastic increase of detachment stress of a rigid punch from adhesive soft viscoelastic layers