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Rate-dependent elastic hysteresis during the peeling of Pressure Sensitive Adhesives

le 5 mars 2015
13H30

Matteo CICCOTTI, Professeur de l’ESPCI, en Mécanique du Solide et des Matériaux, dans le laboratoire PPMD/SIMM,CNRS – Université Pierre et Marie Curie - ESPCI Paristech , interviendra à l'ENS de Cachan lors du séminaire du LMT

Abstract

The modeling of the adherence energy during peeling of Pressure Sensitive Adhesives (PSA) has received much attention since the 1950's, uncovering several factors that aim at explaining their high adherence on most substrates, such as the softness of the adhesive, its strong viscoelastic behavior, the low thickness of the adhesive layer and its confinement by a rigid backing. The more recent investigation of adhesives by probe-tack methods also revealed the importance of cavitation and stringing mechanisms during debonding, underlining the influence of large deformations and of the related non-linear response of the material which also intervenes during peeling. Although a global modeling of the complex coupling of all these ingredients remains out of reach, we report here some key experiments and modeling arguments that should constitute an important step forward. We first measure a non-trivial dependence of the adherence energy on the loading geometry, namely through the influence of the peeling angle, which is found to be separable from the peeling velocity dependence. Secondly, we measure an independent effect of non-linear rheology on adhesives that have nearly the same linear rheology and remain close to commercial PSA. We complete both measurements with a microscopic investigation of the bonding region. We discuss existing modelings in light of these measurements and of recent soft material mechanics arguments to show that the adherence energy during peeling of PSA should not be associated to the propagation of an interfacial stress singularity, but to the energy loss by viscoelastic hysteresis associated to the deformation mechanisms over the whole adhesive thickness.

Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci de - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
Plan d'accès
Partenaires :
Séminaire Matteo Ciccotti

Documents à télécharger :

Agenda des séminaires 2013


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