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Micro-mechanisms of a laminated packaging material during fracture
Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
2014 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 127Article in journal (Refereed) PublishedAlternative title
Micro-mechanisms of a laminated packaging material during fracture (Swedish)
Abstract [en]

The micro-mechanisms of fracture in a laminate composed of an aluminium foil and a polymer film are considered in this study. The laminates as well as the individual layers, with and without premade centre-cracks, were tensile tested. Visual inspection of the broken cross-sections shows that failure occurs through localised plasticity. This leads to a decreasing and eventually vanishing cross-section ahead of the crack tip for both the laminate and their single constituent layers. Experimental results are examined and analysed using a slip-line theory to derive the work of failure. An accurate prediction was made for the aluminium foil and for the laminate but not for the freestanding polymer film. The reason seems to be that the polymer material switches to non-localised plastic deformation with significant strain-hardening.

Place, publisher, year, edition, pages
Elsevier , 2014. Vol. 127
Keywords [en]
Aluminium, Laminate, Polymer, SEM, Toughness
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:bth-6600DOI: 10.1016/j.engfracmech.2014.04.017ISI: 000341551700023Local ID: oai:bth.se:forskinfo896ACA1E962E694BC1257D61006E5B27OAI: oai:DiVA.org:bth-6600DiVA, id: diva2:834118
Note
http://www.sciencedirect.com/science/article/pii/S0013794414001210Available from: 2014-10-10 Created: 2014-09-28 Last updated: 2019-03-28Bibliographically approved
In thesis
1. Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
Open this publication in new window or tab >>Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The final goal of this PhD-work is an efficient and user-friendly finite element modelling strategy targeting an industrial available package opening application.  In order to reach this goal, different experimental mechanical and fracture mechanical tests were continuously refined to characterize the studied materials. Furthermore, the governing deformation mechanisms and mechanical properties involved in the opening sequence were quantified with full field experimental techniques to extract the intrinsic material response. An identification process to calibrate the material model parameters with inverse modelling analysis is proposed. Constitutive models, based on the experimental results for the two continuum materials, aluminium and polymer materials, and how to address the progressive damage modelling have been concerned in this work. The results and methods considered are general and can be applied in other industries where polymer and metal material are present.                                                                   

This work has shown that it is possible to select constitutive material models in conjunction with continuum material damage models, adequately predicting the mechanical behaviour in thin laminated packaging materials. Finally, with a slight modification of already available techniques and functionalities in a commercial general-purpose finite element software, it was possible to build a simulation model replicating the physical behaviour of an opening device. A comparison of the results between the experimental opening and the virtual opening model showed a good correlation.

The advantage with the developed modelling approach is that it is possible to modify the material composition of the laminate. Individual material layers can be altered, and the mechanical properties, thickness or geometrical shape can be changed. Furthermore, the model is flexible and a new opening design with a different geometry and load case can easily be implemented and changed in the simulation model. Therefore, this type of simulation model is prepared to simulate sustainable materials in packages and will be a useful tool for decision support early in the concept selection in technology and development projects.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2019. p. 140
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 9
Keywords
aluminium foil, FEM, LDPE, localisation, necking, polymer, progressive damage, semi-crystalline, simulation, virtual twin
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:bth-17748 (URN)978-91-7295-374-1 (ISBN)
Public defence
2019-05-29, J1650, BTH, Campus Gräsvik, Karlskrona, 13:30 (English)
Opponent
Supervisors
Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-05-09Bibliographically approved

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Andreasson, EskilKao-Walter, Sharon

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