Abstract
A new miniature mixed mode bending (MMMB) setup for in-situ characterization of interface delamination in miniature multi-layer structures was designed and realized. This setup consists of a novel test configuration to accomplish the full range of mode mixities and was specially designed with sufficiently small dimensions to fit in the chamber of a scanning electron microscope (SEM) or under an optical microscope for detailed real-time fracture analysis during delamination. Special care was taken to minimize the effects of friction, the influence of gravity, and non-linearities due to the geometry of the setup. The performance of the setup was assessed using specially-designed test samples supported by finite element analyses. Delamination experiments conducted on homogeneous bilayer samples in mode I and mixed mode loading were visualized with a scanning electron microscope and showed the formation of small micro cracks ahead of the crack tip followed by crack bridging and a full crack, thereby demonstrating the advantages of in-situ testing to reveal the microscopic delamination mechanism.
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Acknowledgements
This research was carried out under the project number MC2.05235 in the framework of the Research Program of the Materials innovation institute M2i (http://www.m2i.nl), the former Netherlands Institute for Metals Research. Authors are grateful to M.P.F.H.L. van Maris for his assistance in conducting the experiments reported in this article.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Kolluri, M., Thissen, M.H.L., Hoefnagels, J.P.M. et al. In-situ characterization of interface delamination by a new miniature mixed mode bending setup. Int J Fract 158, 183–195 (2009). https://doi.org/10.1007/s10704-009-9356-1
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DOI: https://doi.org/10.1007/s10704-009-9356-1