Journal
ACTA MATERIALIA
Volume 69, Issue -, Pages 37-46Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.01.041
Keywords
Buckling; Delamination; Telephone cord; Pattern
Funding
- Basic Research Program of China [2010CB934700, 2011CB302100]
- National Natural Science Foundation of China [11072232, 11222219, 11132009]
- Fundamental Research Funds for the Central Universities [WK2090050027]
- Advanced Engineering Programme and School of Engineering
- Monash University Malaysia [06-02-10SF0195]
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The growth mechanisms of nonlinear buckle-delamination patterns from straight-sided to telephone cord and network-like blisters have been studied using a continuum modeling and simulation approach, which was extended to deal with cubic anisotropic elasticity in thin films. The buckling-delamination process is formulated using the time-dependent Ginzburg Landau kinetic equations, driven by minimizing the film substrate total free energy, including the elastic energies in both the film and the substrate, and the mixed-mode interfacial adhesion between them. It has been found that strong mixed-mode adhesion favored growth of telephone cord buckles via pinning of the buckle front, a sufficiently large biaxial compression caused branching of primary telephone cord buckles and an increase in the substrate compliance suppressed the undulation instability of the straight-sided blister tip. In addition, the compression anisotropy was found to dominate the oriented growth of the undulated blister. The good agreement between the details of simulated network-like blisters and those widely observed in experiments demonstrated that their formation was closely related to the above-mentioned mechanisms. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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