Buckling of a stiff thin film on a pre-strained bi-layer substrate

Huanyu Cheng, Yihui Zhang, Keh Chih Hwang, John A. Rogers, Yonggang Huang

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Controlled buckling can impart stretchable mechanics to brittle materials when integrated as thin films on soft, elastomeric substrates. Typical elastomers are permeable to fluids, however, and therefor unable to provide robust barriers to entry of water, for instance, into devices built with the supported thin films. In addition, the mechanical strength of a system dominated by a soft substrate is often unsatisfactory for realistic applications. We show that introduction of a bi-layer substrate yields a robust, high strength system that maintains stretchable characteristics, with a soft layer on top of a relatively stiff layer in the substrate. As a mechanical protection, a soft encapsulation layer can be used on top of the device and the stretchability of the encapsulated system is smaller than that of the system without encapsulation. A simple, analytic model, validated by numerical analysis and FEA, is established for stiff thin films on a bi-layer substrate, and is useful to the design of stretchable systems.

Original languageEnglish (US)
Pages (from-to)3113-3118
Number of pages6
JournalInternational Journal of Solids and Structures
Volume51
Issue number18
DOIs
StatePublished - Jan 1 2014

Fingerprint

buckling
Buckling
Thin Films
Substrate
Thin films
Substrates
thin films
Encapsulation
Elastomers
brittle materials
Brittle Materials
elastomers
Brittleness
high strength
entry
Strength of materials
numerical analysis
Mechanics
Numerical analysis
Numerical Analysis

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

Cite this

Cheng, Huanyu ; Zhang, Yihui ; Hwang, Keh Chih ; Rogers, John A. ; Huang, Yonggang. / Buckling of a stiff thin film on a pre-strained bi-layer substrate. In: International Journal of Solids and Structures. 2014 ; Vol. 51, No. 18. pp. 3113-3118.
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Buckling of a stiff thin film on a pre-strained bi-layer substrate. / Cheng, Huanyu; Zhang, Yihui; Hwang, Keh Chih; Rogers, John A.; Huang, Yonggang.

In: International Journal of Solids and Structures, Vol. 51, No. 18, 01.01.2014, p. 3113-3118.

Research output: Contribution to journalArticle

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AU - Cheng, Huanyu

AU - Zhang, Yihui

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AB - Controlled buckling can impart stretchable mechanics to brittle materials when integrated as thin films on soft, elastomeric substrates. Typical elastomers are permeable to fluids, however, and therefor unable to provide robust barriers to entry of water, for instance, into devices built with the supported thin films. In addition, the mechanical strength of a system dominated by a soft substrate is often unsatisfactory for realistic applications. We show that introduction of a bi-layer substrate yields a robust, high strength system that maintains stretchable characteristics, with a soft layer on top of a relatively stiff layer in the substrate. As a mechanical protection, a soft encapsulation layer can be used on top of the device and the stretchability of the encapsulated system is smaller than that of the system without encapsulation. A simple, analytic model, validated by numerical analysis and FEA, is established for stiff thin films on a bi-layer substrate, and is useful to the design of stretchable systems.

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