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

Abstract

Effects of tensile and compressive in-plane stress fields on adhesion in laser induced delamination experiments Fedorov, A.; 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. In this work, the adhesion of a polymer coating on steel substrate subjected to uniaxial tensile plastic deformations was studied with the laser induced delamination technique. A decrease in the practical work of adhesion has been measured as the deformation of the substrate progressed. Moreover, it was observed that the deformation of the metal substrate introduced in-plane stresses in the polymer coating. Delamination was studied under compressive or tensile in-plane stresses. The model presented enabled to derive from the experimental data not only the practical work of adhesion but also the magnitude and the character ͑tensile or compressive͒ of the in-plane stress. The strain fields of the metal substrate during plastic deformation and after the elastic relaxation were monitored with a digital image correlation analysis system. The measured strain fields were confronted to the in-plane stresses obtained from the delamination experiments.

Multiscale monitoring of interface failure of brittle coating/ductile substrate systems: A non-destructive evaluation method combined digital image correlation with acoustic emission

“…The digital image correlation (DIC) technique, which measures strain fields by tracking random speckle patterns on specimen surface, [9][10][11] is suitable for continuously detecting micro/nano-scale deformations. [12,13] In addition, accompanied with cracking and coating fracture, the locally stored elastic energy is released in the form of acoustic emission (AE) signals. AE is a passive non-destructive testing technique that relies upon the detection of stress waves propagated through a solid as it undergoes strain.…”