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Research Papers

PDMS-Glass Interface Adhesion Energy Determined Via Comprehensive Solutions for Thin Film Bulge/Blister Tests

[+] Author and Article Information
Aarash Sofla

Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA 22904

Erkin Seker, James P. Landers

Department of Chemistry, University of Virginia, Charlottesville, VA 22904; Center for Microsystems in the Life Sciences, University of Virginia, Charlottesville, VA 22904

Matthew R. Begley1

Department of Mechanical and Aerospace Engineering and Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904; Center for Microsystems in the Life Sciences, University of Virginia, Charlottesville, VA 22904begley@virginia.edu

1

Corresponding author.

J. Appl. Mech 77(3), 031007 (Feb 04, 2010) (5 pages) doi:10.1115/1.4000428 History: Received March 07, 2009; Revised September 24, 2009; Published February 04, 2010; Online February 04, 2010

This paper provides comprehensive relationships for pressure, deflection, energy release rate, and phase angle for bulge testing, which are valid for all combinations of the testing length-scales (film thickness, debond size, and bulge height) and materials. These solutions can be used to design experiments that vary relative contributions of opening and sliding displacements at the crack tip by modulating the film thickness, debond size, and bulge volume. Their closed-form nature greatly facilitates property extraction via regression, e.g., modulus from experimental pressure/deflection data or interface toughness from debond size/injected volume data. This is illustrated using experiments to quantify the interfacial adhesion energy between an initially dry polydimethylsiloxane-glass interface via bulge testing under controlled volume injection. The results indicate that the mode-mixity has no effect on the energy required for debonding, which suggests that wetting of the crack faces behind the debonding front eliminates friction.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic illustration of the bulge test and representative image of the delamination front during a blister test on PDMS. The debond radius is estimated by fitting a curve to the edge of the region where the dyed fluid is visible.

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Figure 2

Illustration of the basic relationships between normalized variables, the fitted interpolation functions, and relative error, for v=0, 1/4, and 1/2. Differences due to Poisson's ratio are subtle, but strongly influence mode-mixity during debonding.

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Figure 3

The interface debonding parameters as a function of deflection for several material parameters, and the relative error between values computed via raw numerical data and those computed using interpolation functions

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Figure 4

Experimental results for aqueous injection: (a) deflection versus pressure (used to determine modulus), and (b) debond radius versus deflection (used to determine interface toughness). Points without error bars have smaller deviations than the plotting symbols.

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Figure 5

Predictions of the phase angles for each test as a function of experimentally measured deflection, and the interface toughness implied by curve fitting to the results in Fig. 4. The error bars on the toughness reflect the standard deviation from three measurements, while the error bars on the phase angle reflect the range probed during the test.

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