Research Papers

Mechanics of Periodic Film Cracking in Bilayer Structures Under Stretching

[+] Author and Article Information
Xianhong Meng

School of Aeronautic Science and Engineering,
Beihang University,
Beijing 100191, China

Zihao Wang

School of Aeronautic Science and Engineering,
Beihang University,
Beijing 100191, China;
Academy of Opto-Electronics,
Chinese Academy of Sciences,
Beijing 100094, China
e-mail: wangzihao@buaa.edu.cn

Sandra Vinnikova

School of Mechanical and
Aerospace Engineering,
Oklahoma State University,
Stillwater, OK 74078

Shuodao Wang

School of Mechanical and
Aerospace Engineering,
Oklahoma State University,
Stillwater, OK 74078
e-mail: shuodao.wang@okstate.edu

1Corresponding authors.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received February 22, 2018; final manuscript received March 23, 2018; published online May 8, 2018. Editor: Yonggang Huang.

J. Appl. Mech 85(7), 071006 (May 08, 2018) (6 pages) Paper No: JAM-18-1115; doi: 10.1115/1.4039757 History: Received February 22, 2018; Revised March 23, 2018

In a bilayer structure consisting of a stiff film bonded to a soft substrate, the stress in the film is much larger when the rigidity of the film is much higher than that of the substrate so that film cracking is a common phenomenon in bilayer structures such as flexible electronics and biological tissues. In this paper, a theoretical model is developed to analyze the normal stress distribution in the structure to explain the mechanism of the formation of periodic crack patterns. The effects of geometrical and material parameters are systematically discussed. The analytical result agrees well with finite element analysis, and the prediction of spacing between cracks agrees with experiments from the literature.

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Grahic Jump Location
Fig. 1

Periodic crack pattern on a film that is bonded to the top surface of an elastomer

Grahic Jump Location
Fig. 2

Schematic of the theoretical model (front view of Fig. 1)

Grahic Jump Location
Fig. 3

The original model is decomposed into two cases: (a) case 1 and (b) case 2

Grahic Jump Location
Fig. 4

Distribution of the normal stress in the film

Grahic Jump Location
Fig. 5

Distribution of the shear stress at upper surface of substrate

Grahic Jump Location
Fig. 6

Effect of the substrate modulus

Grahic Jump Location
Fig. 7

The maximum normal stress in the film versus varying substrate length (H = 1μm)




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