Journal
EXTREME MECHANICS LETTERS
Volume 4, Issue -, Pages 175-185Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.eml.2015.07.002
Keywords
Freestanding metal thin film; Wrinkling patterns; Patterned defects; Post-buckling analysis; Finite-element simulations
Funding
- Australian Research Council [DE130101639]
- National Science Foundation through a CAREER [DMR-1255305]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DESC0008135, DE-FG02-07ER46437]
- Direct For Mathematical & Physical Scien [1255305] Funding Source: National Science Foundation
- Division Of Materials Research [1255305] Funding Source: National Science Foundation
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Wrinkling patterns in freestanding metal thin films under tensile loading are investigated through finite-element simulations with experimental validation. Numerical simulations of the tensile testing of a thin film specimen with different arrays of holes were conducted. Good agreement between experiments and simulations was found for not only the spatial wrinkling pattern distributions, but also the pattern evolution over the different loading stages. The numerical results show that plasticity plays an important role in the evolution of wrinkling patterns and their associated interactions in Al thin films. It was found that the spacing between defects and defect size control the level of interaction between wrinkle branches generated by the defects. Strong interactions resulted in the merging of different wrinkle branches into one single wrinkle with a large displacement amplitude and a well-defined profile in the out-of-plane direction. The simulations proved to be robust in their descriptions of the experimentally observed wrinkling phenomenon and could be used to predict wrinkling in other hole-patterned thin film configurations. The interaction and merging of wrinkle branches from multiple holes indicate that the resulting wrinkle patterns can be manipulated by using different defect configurations to achieve a desired wrinkled microstructure''. (C) 2015 Elsevier Ltd. All rights reserved.
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