Acta Mater. 61, 2425-2433, 2013
F. Toth1, F.G. Rammerstorfer1, M.J.Cordill2, F.D. Fischer3
1Institute of Lightweight Design and Structural
TU Wien, Vienna, Austria
2Erich Schmid Institute for Materials Science,
3Department of Mechanics,
Montanuniversität Leoben, Austria
Tensile specimens of metal films on compliant substrates are widely used for
determining interfacial properties.
These properties are identified by the comparison of experimentally observed
delamination buckling and a mathematical model which contains the interface
properties as parameters.
The current two-dimensional models for delamination buckling are not able to
capture the complex stress and deformation states arising in the considered
uniaxial tension test in a satisfying way.
Therefore, three-dimensional models are developed in a multi-scale approach.
It is shown that, for the considered uniaxial tension test, the buckling and
associated delamination process are initiated and driven by interfacial shear
in addition to compressive stresses in the film.
The proposed model is able to reproduce all important experimentally observed
phenomena, like cracking stress of the film, film strip curvature and formation
of triangular buckles.
Combined with experimental data, the developed computational model is found to
be effective in determining interface strength properties.