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Technical Briefs

Evaluation of Transverse Shear Effect on Film Delamination in Blister Test

[+] Author and Article Information
Wei Wang, Nicole Coutris

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

Yong Huang1

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634yongh@clemson.edu

Hongseok Noh

Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104

Peter J. Hesketh

GWW School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

1

Corresponding author.

J. Electron. Packag 132(1), 014501 (Feb 25, 2010) (5 pages) doi:10.1115/1.4000717 History: Received February 22, 2009; Revised September 18, 2009; Published February 25, 2010; Online February 25, 2010

The transverse shear effect has been frequently ignored in determining the debonding-related energy release rate and the phase angle in the blister test, resulting in underestimated values. This study aims to study the effect of shear force on the energy release rate and phase angle prediction in the blister test. A generalized approach is proposed to predict them under the effect of shear force. The predictions show that when the ratio of the film thickness to the debonded film window radius is large (such as 0.05), the transverse shear effect cannot be ignored in determining the energy release rate and the phase angle. The study also further illustrates the importance of including the shear force contribution in estimation and how this importance depends on the film thickness to debonded radius ratio, as well as the elastic mismatch.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Blister test schematic and (b) the experimental setup

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Figure 2

Γ predictions using the proposed model (Eq. 1), simplified model (8) and energy balance method-based experimental formula, and the phase angle variation under the effect of shear force (h1/R=0.05 and α=−0.4)

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Figure 3

Effect of film thickness to debonded radius ratio on energy release rate and phase angle (α=−0.4 and p/p0=15)

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Figure 4

Effect of elastic mismatch on energy release rate (p/p0=15)

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Figure 5

Effect of elastic mismatch on phase angle (p/p0=15)

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