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O. van der Sluis, T. Vermeij, J. Neggers, B. Vossen, M. van Maris, J. Vanfleteren, M.G.D. Geers, J.P.M. Hoefnagels
Research output: Contribution to journal › Article › Academic › peer-review
Metal-elastomer interfacial systems, often encountered in stretchable electronics, demonstrate remarkably high interface fracture toughness values. Evidently, a large gap exists between the rather small adhesion energy levels at the microscopic scale ('intrinsic adhesion') and the large measured macroscopic work-of-separation. This energy gap is closed here by unravelling the underlying dissipative mechanisms through a systematic numerical/experimental multi-scale approach. This self-containing contribution collects and reviews previously published results and addresses the remaining open questions by providing new and independent results obtained from an alternative experimental set-up. In particular, the experimental studies on Cu-PDMS (Poly(dimethylsiloxane)) samples conclusively reveal the essential role of fibrillation mechanisms at the micro-meter scale during the metal-elastomer delamination process. The micro-scale numerical analyses on single and multiple fibrils show that the dynamic release of the stored elastic energy by multiple fibril fracture, including the interaction with the adjacent deforming bulk PDMS and its highly nonlinear behaviour, provide a mechanistic understanding of the highwork-of-separation. An experimentally validated quantitative relation between the macroscopic work-of-separation and peel front height is established from the simulation results. Finally, it is shown that a micro-mechanically motivated shape of the traction-separation law in cohesive zone models is essential to describe the delamination process in fibrillating metal-elastomer systems in a physically meaningful way.
Original language | English |
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Article number | 231 |
Number of pages | 19 |
Journal | Materials |
Volume | 11 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2 Feb 2018 |
Acknowledgments: Parts of this work were supported by the European Commission under project Stella (IST-028026), the Dutch Organization for Scientific Research (NWO) and the Dutch Technology Foundation (STW). The authors would like to thank Omid Sedaghat, Sjoerd Tilmans, Don Keijzers, Kaipeng Hu, Peter Timmermans, Y.Y. HSu, and Mario Gonzalez.
Research output: Contribution to journal › Article › Academic › peer-review
Research output: Contribution to journal › Article › Academic › peer-review
Research output: Contribution to journal › Article › Academic › peer-review