Effect of film thickness on the stretchability and fatigue resistance of Cu films on polymer substrates

Title
Effect of film thickness on the stretchability and fatigue resistance of Cu films on polymer substrates
Authors
김병준신해아슬이지훈양태열Thomas HaasPatric Gruber최인석Oliver Kraft주영창
Keywords
Fatigue; Flexible; Cu thin film; Crack; Bending
Issue Date
2014-12
Publisher
Journal of materials research
Citation
VOL 29, NO 23, 2827-2834
Abstract
The thickness dependence of the electrical stability under monotonic and cyclic tensile loading is investigated for Cu films on polymer substrates. As for monotonic tensile deformation, thicker films show better stability than thinner films due to their higher ductility and the larger capability of strain accommodation. For the fatigue resistance, however, a more complex behavior was observed depending on the amount of the applied strain. For low strain amplitude in the high cycle fatigue (HCF) regime, thinner films exhibit longer fatigue life because the larger strength of thinner films suppresses dislocation movement and damage nucleation. However, for high strain amplitudes in the low cycle fatigue (LCF) regime, the fatigue life for thinner films is drastically reduced compared to thicker films. It is shown that fatigue coefficients in the LCF regime can be obtained when applying the Coffin–Manson relationship.
URI
http://pubs.kist.re.kr/handle/201004/49380
ISSN
08842914
Appears in Collections:
KIST Publication > Article
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