Controlled Bi-Axial Buckling and Postbuckling of Thin Films Suspended on a Stretchable Substrate with Square Prism Relief Structures

Stretchable electronics have spurred rapid developments from curvilinear devices to bio-integrated diagnostic and therapeutic devices. The wavy configuration in the device components on a stretchable elastomeric substrate surface plays a prominent role in simultaneously achieving high areal coverage and stretchability without compromising the electric performance, resulting in unique applications in stretchable and flexible light-emitting diodes (LEDs), batteries, supercapacitors, and photovoltaics. In this study, we investigate the buckling behaviors of stiff thin films on the top surface of a biaxially pre-strained elastomeric substrate with square prism micro-patterned structures. Based on energy minimization, a theoretical model is established to study the buckling profiles and the maximum strain for different pre-strain levels along two directions, which agrees reasonably well with those obtained by the finite element analysis (FEA). After revealing the effect of the center-To-center distance in micro-patterned structures and the interfacial contact width between the film and substrate on the buckling behavior, the elastic stretchability of the system is studied.

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Work Title Controlled Bi-Axial Buckling and Postbuckling of Thin Films Suspended on a Stretchable Substrate with Square Prism Relief Structures
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Open Access
Creators
  1. Xiaoyang Zhang
  2. Qingmin Yu
  3. Huaping Wu
  4. Huanyu Cheng
Keyword
  1. Bi-axial buckling and post-buckling
  2. Suspended thin film
  3. Substrate with square prism relief structures
  4. Stretchability
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. International Journal of Applied Mechanics
Publication Date January 19, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1142/S1758825121501234
Deposited July 19, 2022

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Version 1
published

  • Created
  • Added IJAM_manuscript.pdf
  • Added Creator Xiaoyang Zhang
  • Added Creator Qingmin Yu
  • Added Creator Huaping Wu
  • Added Creator Huanyu Cheng
  • Published
  • Updated Keyword, Publication Date Show Changes
    Keyword
    • Bi-axial buckling and post-buckling, Suspended thin film, Substrate with square prism relief structures, Stretchability
    Publication Date
    • 2022-01-01
    • 2022-01-19