Strong Toughening Mechanisms in an Elastic Plastic Laminate

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Strong Toughening Mechanisms in an Elastic Plastic Laminate

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Publication Conference Paper, peer reviewed
Title Strong Toughening Mechanisms in an Elastic Plastic Laminate
Author(s) Ståhle, Per ; Bjerkén, Christina ; Tryding, Johan ; Kao-Walter, Sharon
Date 2007
English abstract
The fracture process of a laminate is analysed. The laminate is a material used for packaging. It consists of a thin aluminium foil with a polymer coating. In both materials, the fracture processes are supposed to be dominantly localized plastic deformation. A Barenblatt region is supposed to spread ahead of the crack tip. This region is analysed in its cross plane invoking plane deformation conditions. The fracture process is assumed to be continuous reduction of the cross sectional area in the crack plane until the load carrying capacity vanishes with the vanishing cross sectional area. One case where the interface between the two materials is perfectly bonded and one case with delamination of the interface are examined. The results are compared with the properties of the individual layers. At fracture mechanical testing of the laminate, it is observed that the load carrying capacity increases dramatically as compared with that of the individual layers. When peak load is reached for the laminate, strains are fairly small and only the aluminium is expected to carry any substantial load because of the low sti*ness of the polymer. It is therefore surprising that the strength of the laminate is almost twice the strength of the aluminium foil. The reason seems to be that the constraint introduced across the interface, forces the polymer to absorb large quantities of energy at small nominal strain. The toughness compares well with the accumulated toughness of all involved layers. Based on the results, a method is suggested for designing ultra tough laminates based on careful selection of material combinations and interface properties. The method gives a laminate that produces mutlple necking.
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Publisher DTU Risø
Host/Issue Interface design of polymer matrix composites mechanics, chemistry, modelling and manufacturing : proceedings of the 28th Riso International Symposium on Materials Science, 3-6 September 2007
Series/Issue Proceedings of the ... Risø International Symposium on Materials Science;28
ISSN 0907-0079
ISBN 978-87-550-3626-0
Pages 273-279
Language eng (iso)
Subject(s) Humanities/Social Sciences
Research Subject Categories::TECHNOLOGY::Materials science
Note 28th Risø International Symposium on Materials Science, Roskilde, Denmark, 3-6 September 2007
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