Comparison of dynamic and quasi-static measurements of thin film adhesion

Tran, P 2011, 'Comparison of dynamic and quasi-static measurements of thin film adhesion', Journal of Physics D: Applied Physics, vol. 44, no. 3, pp. 1-1.

Document type: Journal Article
Collection: Journal Articles

Title Comparison of dynamic and quasi-static measurements of thin film adhesion
Author(s) Tran, P
Year 2011
Journal name Journal of Physics D: Applied Physics
Volume number 44
Issue number 3
Start page 1
End page 1
Total pages 1
Publisher Institute of Physics Publishing Ltd.
Abstract Adhesive failure and the attendant delamination of a thin film on a substrate is controlled by the fracture energy required to propagate a crack along the interface. Numerous testing protocols have been introduced to characterize this critical property, but are limited by difficulties associated with applying precise loads, introducing well-defined pre-cracks, tedious sample preparation and complex analysis of plastic deformation in the films. The quasi-static four-point bend test is widely accepted in the microelectronics industry as the standard for measuring adhesion properties for a range of multilayer thin film systems. Dynamic delamination methods, which use laser-induced stress waves to rapidly load the thin film interface, have recently been offered as an alternative method for extracting interfacial fracture energy. In this work, the interfacial fracture energy of an aluminium (Al) thin film on a silicon (Si) substrate is determined for a range of dynamic loading conditions and compared with values measured under quasi-static conditions in a four-point bend test. Controlled dynamic delamination of the Al/Si interface is achieved by efficient conversion of the kinetic energy associated with a laser-induced stress wave into fracture energy. By varying the laser fluence, the fracture energy is investigated over a range of stress pulse amplitudes and velocities. For lower amplitudes of the stress wave, the fracture energy is nearly constant and compares favourably with the critical fracture energy obtained using the four-point bend technique, about 2.5 Jm-2. As the pulse amplitude increases, however, a rate dependence of the dynamic fracture energy is observed. The fracture energy increases almost linearly with pulse amplitude until reaching a plateau value of about 6.0 Jm-2.
Subject Composite and Hybrid Materials
Numerical Modelling and Mechanical Characterisation
Solid Mechanics
DOI - identifier 10.1088/0022-3727/44/3/034006
Copyright notice © 2011 IOP Publishing Ltd.
ISSN 0022-3727
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