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Research Article | Open Access

Decohesion of graphene from a uniaxially-stretched substrate: Failure analysis of a frictional adhesive interface

Bo PENG1, Chaochen XU1, Qingao WANG1, Pei ZHAO3,4, Xiqiao FENG1,2, Qunyang LI1,2( )
AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
Center for X-Mechanics and Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
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Abstract

Composite structures consisting of two-dimensional (2D) materials deposited on elastic substrates have a wide range of potential applications in flexible electronics. For such devices, robust 2D film/substrate interfacial adhesion is essential for their reliable performance when subjected to external thermal and mechanical loads. To better understand the strength and failure behavior of the 2D film/substrate interfaces, two types of graphene/polymer samples with distinct interfacial adhesion properties are fabricated and tested by uniaxially stretching the substrates. Depending on the interfacial adhesion, two drastically different debonding rates are observed, i.e., rapid snap-through debonding and more progressive crack propagation. Motivated by the experimental observation, we propose an improved shear-lag model with a trapezoidal-shaped cohesive zone to derive an analytical solution for the decohesion behavior. The theoretical model reveals that the decohesion behavior of the frictional adhesive interface is governed by three dimensionless parameters. Particularly, the dimensionless length of the film essentially determines the decohesion rate; while the other two parameters affect the critical substrate strain to initiate debonding. By fitting the experimental data with the theoretical model, the intrinsic adhesion properties of the two samples are obtained with physically meaningful values. This work offers an analytical solution to describing the decohesion behavior of general thin film/substrate systems with a frictional adhesive interface, which is beneficial for characterizing and optimizing the mechanical properties of various thin film/polymer devices.

Keywords

film/substrate systemsadhesionfrictional slidinginterface decohesioncohesive-zone model

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Friction
Volume 12 Issue 3,
March 2024
Pages 510-521
DOI: 10.1007/s40544-023-0779-x
Cite this article:
PENG B, XU C, WANG Q, et al. Decohesion of graphene from a uniaxially-stretched substrate: Failure analysis of a frictional adhesive interface. Friction, 2024, 12(3): 510-521. https://doi.org/10.1007/s40544-023-0779-x

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Received: 12 February 2023
Revised: 12 March 2023
Accepted: 09 May 2023
Published: 03 June 2023
© The author(s) 2023.

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