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An interesting recent paper by Menga, Carbone & Dini (MCD, 2018, [1]),suggests that in sliding adhesive contacts, the contact area should increasedue to tangential shear stresses at the interface, assumed to be constant andcorresponding to a material constant. This is not observed in the knownexperiments, and is in sharp contrast with all the classical theories about thetransition from stick to sliding, both in the JKR (Griffith like) conditionswhich involve singular pressure and shear, as well as in full general cohesivemodels. We offer a rigorous thermodynamics calculation, which suggests in factthere is no qualitative contrast but a very close quantitative agreement, withprevious theories. Actually, the model predicts an even stronger reduction ofcontact area than predicted by Savkoor and Briggs, contrary to experimentalobservations, so would certainly require some adjustements to considerdissipative effects.

Resolving a controversy about adhesion in sliding contacts