Title of article :
Adhesion along metal–polymer interfaces during plastic
deformation
Author/Authors :
R. van Tijum، نويسنده , , W. P. Vellinga، نويسنده , , J. TH. M. DE HOSSON?، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2007
Abstract :
In this paper a numerical study is presented
that concentrates on the influence of the interface
roughness that develops during plastic deformation of
a metal, on the work of adhesion and on the change of
interface energy upon contact with a glassy polymer.
The polymer coating is described with a constitutive
law that mimics the behavior of Poly-Ethylene Terephthalate.
It includes an elastic part, a yield stress,
softening and hardening with increasing strains. For
the interface between the metal and the polymer a
mixed-mode (mode I and II) stress-separation law is
applied that defines the interface energy and an
interaction length scale. At the onset of deformation
the surface of the substrate has a self-affine roughness
characterized by the so-called Hurst exponent, a
correlation length and an rms roughness amplitude,
that evolves as a function of increasing strain. The
findings are the following: the interface energy
decreases until the strain at yield of the polymer
coating. Interestingly, after yielding as the polymer
starts to soften macroscopically, the decreasing average
stress levels result in partial recovery of the interface
energy at the interface. At higher strains, when
macroscopic hardening develops the recovery of the
interface stops and the interface energy decreases. The
effect of coating thickness is discussed as well as the
physical relevance of various model parameters
Journal title :
Journal of Materials Science
Journal title :
Journal of Materials Science