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A study of the fracture behaviour of ultrathin coatings on a polymer substrate
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.ORCID iD: 0000-0002-0491-1077
Tetra Pak Packaging Solutions AB, D & E, Lund, Sweden.
Adhemon Sarl, Thin Technology, Lausanne, Switzerland.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.ORCID iD: 0000-0002-0034-3703
2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Metal oxide coating with a nanometer scale thickness on flexible polymer substrates is a viable material combination for food packaging applications. This combination can provide an enhancement of the barrier performance in the package [1]. A concern is the cracking of the brittle coating when subjected to tension and bending in the manufacturing process. Such cracks can affect the permeability.

 This presentation focuses on examining multiple cracking in metal oxide coatings through fragmentation tests [2] by in-situ tensile loading in a table-top scanning electron microscope. This allow for tracking of the crack accumulation and subsequently to calculate adhesive and cohesive properties, such as the interfacial shear strength and the distribution of the coating tensile strength. Furthermore, we will present high-resolution microscopy images of ridge cracking [3], which is mainly caused by compressive deformation due to the transverse Poisson contraction. It will also be demonstrate how to obtain an interfacial fracture toughness parameter between coating and substrate, making use of a micromechanical model and ridge crack dimension. These parameters are compared with results from finite element simulations. The advantages and disadvantages of the experimental methods and numerical simulation will be addressed, as well as the accuracy of the assumptions in their underlying models. Finally, it will also be discussed how the obtained mechanical properties can be used in predicting coating cracking under more complex loadings in manufacturing, and how relevant barrier properties, such as the oxygen transmission rate, may be predicted.

Place, publisher, year, edition, pages
2019.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-388606OAI: oai:DiVA.org:uu-388606DiVA, id: diva2:1334236
Conference
Svenska Mekanikdagar 11-12 juni 2019, KTH, Stockholm, Sweden
Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-08-27Bibliographically approved

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Type fulltextMimetype application/pdf

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Output format
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