Influence of interfacial delamination on channel cracking of elastic thin films |
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Authors: | Haixia Mei Yaoyu Pang Rui Huang |
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Affiliation: | (1) Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, TX 78712, USA |
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Abstract: | Channeling cracks in brittle thin films have been observed to be a key reliability issue for advanced interconnects and other
integrated structures. Most theoretical studies to date have assumed no delamination at the interface, while experiments have
observed channel cracks both with and without interfacial delamination. This paper analyzes the effect of interfacial delamination
on the fracture condition of brittle thin films on elastic substrates. It is found that, depending on the elastic mismatch
and interface toughness, a channel crack may grow with no delamination, with a stable delamination, or with unstable delamination.
For a film on a relatively compliant substrate, a critical interface toughness is predicted, which separates stable and unstable
delamination. For a film on a relatively stiff substrate, however, a channel crack grows with no delamination when the interface
toughness is greater than a critical value, while stable delamination along with the channel crack is possible only in a small
range of interface toughness for a specific elastic mismatch. An effective energy release rate for the steady-state growth
of a channel crack is defined to account for the influence of interfacial delamination on both the fracture driving force
and the resistance, which can be significantly higher than the energy release rate assuming no delamination. |
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Keywords: | Channel cracking Delamination Thin films Interface |
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