ABSTRACT
This book chronicles the proceedings of the First International Symposium on Adhesion Aspects of Thin Films, held in Newark, New Jersey, October 28-29, 1999. Films and coatings are used for a variety of purposes a decorative, protective, functional, etc. a in a host of applications. Irrespective of the intended function or application of a film
TABLE OF CONTENTS
chapter |2 pages
is to identify these adhesional strains by using the radius of curvature and to find the stress in each material. We assume that the total strain (£tot)at any point of the system represented in Fig. 2, is: (Navier-Bemouilli’s hypothesis). Therefore, the effect of transverse shear (rxy = 0) is neglected, (ii) the radius of curvature is large compared with transverse dimensions [width (b) and thickness (h) of the three-layer system], leading to R\ b\, hh (iii) longitudinal elements of the beam are subjected only to simple tension or compression inducing stresses in the x direction, (iv) Young’s modulii of the coating having bulk properties, the interphase and the substrate have the same value in both tension and compression (flexural modulus). Based on these assumptions, final uni-axial residual stresses (a), in the x -direction of the three-layer system (bulk coating/interphase/substrate) are given by: of the zero deformation (y0)- Therefore, we consider two equilibrium conditions for the force (N) and the moment (M) for any cross section (area S) of the coating/interphase/ substrate system:
with £mech is the mechanical strain. Considering the geometry and the size of the three-layer systems studied, the beam theory can be used. For the one-dimensional approach, without lateral (width- wise) stresses, the following assumptions are made: (i) transverse sections of the beam are planar before, during, and after bending where: yo is the position where total strains are equal to zero (£tot = 0), y is the coordinate distance of any longitudinal fiber, R\ is the radius of curvature and E is Young’s modulus. To determine the distribution of residual stresses in the tri-layer system from equation (10) requires a knowledge of the radius of curvature (R\) and the position
chapter |7 pages
Dynamic mechanical thermal analysis (DMTA). Dynamic viscoelastic
Xt variation versus the coating thickness we 2.2.4. Nuclear magnetic resonance spectroscopy (NMR). For proton and carbon
chapter |17 pages
Floating part Precipitate
aluminum and titanium modified DGEBA are shown in Fig. 10. All spectra are