Work of adhesion in laser-induced delamination along polymer-metal interfaces

Abstract

Work of adhesion in laser-induced delamination along polymer-metal interfaces Fedorov, A.; van Tijum, R.; Vellinga, W. P.; de Hosson, J. Th. M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Laser-induced delamination is a recent technique aimed at characterizing adhesive strength of thin polymer coatings on metal substrates. A laser pulse is used to create a blister that initiates further delamination of the film under pressure. To process the experimental data a simple elastic model was developed. The model predicts values for the blister height and pressure in fair agreement with the experimental findings. The critical stress state required for delamination and the work of adhesion are derived. To account for possible plastic deformation computer simulations using finite elements with a mixed mode cohesive zone were carried out. The polymer coating is described with a constitutive law that includes an elastic response, yielding and hardening with increasing strain. The stress fields calculated with finite element model are in agreement with those predicted by the elastic model and it suggests that the contribution of plastic deformation to the work of adhesion is rather limited. Comparative analysis of these two approaches is presented. The theoretical predictions are compared to experimental results obtained for the 40 m thick polyethylene terephthalate film on steel substrate.

Degradation and recovery of adhesion properties of deformed metal–polymer interfaces studied by laser induced delamination

“…The measured practical work of adhesion G comprises the thermodynamic work of adhesion and the irreversible plastic dissipation part. It has been previously demonstrated that in the laser induced delamination test the stress fields introduced in the bulk of the polymer do not exceed the yield stress of the polymer [20]. Therefore, the contribution of the plastic deformations is only limited to the crack tip area.…”

“…Using this model the critical stresses required for delamination and the practical work of adhesion were derived. To account for possible plastic deformation and to validate the analytic model computer simulations using finite elements analysis with a mixed mode cohesive zone were carried out [20]. A fair agreement between the stress fields calculated with FEA code and those predicted by the elastic model has been demonstrated.…”

“…To process the experimental data a simple elastic model was developed and presented in earlier publications [19,20]. Using this model the critical stresses required for delamination and the practical work of adhesion were derived.…”

Effects of tensile and compressive in-plane stress fields on adhesion in laser induced delamination experiments

“…From the shape of the blister, the related stress fields and the practical work of adhesion are derived. 14 A substantial amount of works on modeling of the classical blister test can be found in literature. [5][6][7]13,15 However, there are a number of principle differences between the classical blister test and the one presented in this work.…”

Crack propagation along polymer/non-polymer interfaces

“…[2]) inducing local stress concentrations and deformation in the polymer near the interface [3]. Local delamination techniques such as described in [4] may present a way forward in establishing the effects of such treatments on the adhesion.…”