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Technical Brief

Delamination of a Thin Film Driven by a Flat Cylindrical Shaft

[+] Author and Article Information
Scott E. Julien

Mechanical and Industrial Engineering,
Northeastern University,
Boston, MA 02115

Kai-Tak Wan

Mechanical and Industrial Engineering,
Northeastern University,
Boston, MA 02115
e-mail: ktwan@coe.neu.edu

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received May 3, 2018; final manuscript received June 22, 2018; published online July 17, 2018. Assoc. Editor: Yong Zhu.

J. Appl. Mech 85(11), 114501 (Jul 17, 2018) (5 pages) Paper No: JAM-18-1253; doi: 10.1115/1.4040695 History: Received May 03, 2018; Revised June 22, 2018

An analytical model is derived for the delamination of a thin film from a rigid substrate by a cylindrical shaft with a flat end and finite radius. We show that, within certain limitations, a point-load model can be applied to the system, to give simple relations between the film-substrate energy of adhesion and the measured variables of applied shaft force, blister height, and blister radius. The results are applicable to systems where a finite size cylindrical shaft or disk generates delamination of the film from the substrate.

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References

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Figures

Grahic Jump Location
Fig. 1

Schematics of (a) clamped and (b) unclamped shaft-loaded blisters. The top figures in physical dimensions show delamination being driven by an external load, while the bottom in dimensionless parameters correspond to an intercalated disk at equilibrium.

Grahic Jump Location
Fig. 2

Applied load as a function of crack radius under fixed load and (a) pure bending and (b) pure stretching deformation for clamped (dark) and unclamped (gray or red) blister configurations. Dashed lines indicate the limiting cases.

Grahic Jump Location
Fig. 3

Shaft displacement as a function of crack radius under fixed displacement and (a) pure bending and (b) pure stretching deformation for clamped (dark) and unclamped (gray or red) blister configurations. Dashed lines indicate limiting cases. For an intercalated disk, shaft displacement is equivalent to the height of the disk.

Grahic Jump Location
Fig. 4

Mechanical response, or, applied load as a function of shaft displacement (disk height) under (a) pure bending and (b) pure stretching for clamped (dark) and unclamped (gray or red) blister configurations. Dashed lines indicate limiting cases.

Grahic Jump Location
Fig. 5

The dimensionless parameter χ = G/(Fw0/A) as a function of crack radius for (a) pure bending and (b) pure stretching for clamped (dark) and unclamped (gray or red) blister configurations. Dashed lines indicate limiting cases.

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