Direct Visualization of Cross-Sectional Strain Distribution in Flexible Devices

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For flexible devices that inevitably undergo repetitive deformations, it is important to evaluate and control the mechanical strain imposed on the flexible systems for enhancing the reliability. In this paper, a novel experimental method to directly visualize cross-sectional strain distribution in the thin flexible devices is proposed. Digital image correlation (DIC) is effectively adapted by using microscopic images of the cross section for accurate analysis of the microscale deformations. To conduct the DIC strain analysis, speckle patterning is accomplished by using microparticles from diamond-abrasive suspensions with optimized fabrication conditions. First, the cross-sectional micro-DIC analysis is performed successfully for 100 mu m-thick substrates. Full-field strain quantification and easy inspection of a neutral plane are demonstrated and compared with results of finite element analysis simulation. Using the presented method, generation of multiple neutral planes is clearly visualized for a trilayer structure with a very soft adhesive midlayer, where strain decoupling occurs by severe shear deformation of the soft adhesive layer. Furthermore, bending strain distribution in a flexible fabric-reinforced polymer (FRP) substrate is also investigated to analyze and predict fatigue fracture in the complex inner structure under repetitive bending loading.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-04
Language
English
Article Type
Article
Citation

ACS APPLIED MATERIALS & INTERFACES, v.11, no.14, pp.13416 - 13422

ISSN
1944-8244
DOI
10.1021/acsami.9b01480
URI
http://hdl.handle.net/10203/271670
Appears in Collection
MS-Journal Papers(저널논문)ME-Journal Papers(저널논문)
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