Investigation of buckling transition from straight-sided to telephone-cord wrinkles in Al films

Aluminum films 150 nm thick have been deposited on polymethylmethacrylate (PMMA) substrates by a magnetron sputtering process. Parallel straight-sided wrinkles are induced by axial compression. The evolution from straight-sided to 'telephone-cord' wrinkles is experimentally investigated us...

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Bibliographic Details
Published in:Journal of micromechanics and microengineering 2013-04, Vol.23 (4), p.45014-9
Main Authors: Jia, Haikun, Wang, Shibin, Goudeau, Philippe, Li, Linan, Xue, Xiuli
Format: Article
Language:English
Subjects:
Aluminum
Bifurcations
Buckling
Condensed matter: structure, mechanical and thermal properties
Defects
Exact sciences and technology
finite element analysis
Finite element method
instability
Mathematical analysis
Mathematical models
Perturbation methods
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
thin film
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Summary:Aluminum films 150 nm thick have been deposited on polymethylmethacrylate (PMMA) substrates by a magnetron sputtering process. Parallel straight-sided wrinkles are induced by axial compression. The evolution from straight-sided to 'telephone-cord' wrinkles is experimentally investigated using optical microscopy. Finite element modeling of instability is introduced for analyzing the secondary bifurcation or buckling of straight-sided wrinkles. Imperfections based on a random combination of buckling eigenmodes are introduced in the finite element method (FEM) analysis to take into account secondary bifurcation. Because the perturbation of the imperfection is totally random and small, it is a more realistic approach for taking into account the roughness and flatness of the film. Moreover, the perturbation method can be applied more widely in some complex patterns of telephone-cord wrinkles. Good agreement is found between experimental observation and FEM calculations.
ISSN:0960-1317
1361-6439
DOI:10.1088/0960-1317/23/4/045014