Fracture Toughness of a Laminated Composite

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Fracture Toughness of a Laminated Composite

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Publication Conference Paper, peer reviewed
Title Fracture Toughness of a Laminated Composite
Author(s) Kao-Walter, Sharon ; Ståhle, Per ; Hägglund, Richard
Date 2003
English abstract
The fracture toughness of a polymer-metal laminate composite is obtained by mechanical testing of a specimen containing a pre-crack. The laminate is a material used for packaging. It consists of a thin aluminium foil and a polymer coating. A centre cracked panel test geometry is used. Each of the layers forming the laminate is also tested separately. The result is compared with the measured fracture strength of the individual layers. It is observed that the load carrying capacity increases dramatically for the laminate. At the strain when peak load is reached for the laminate only aluminium is expected to carry any substantial load because of the low stiffness of the LDPE. However, the strength of the laminate is almost twice the strength of the aluminium foil. The reason seems to be that the aluminium forces the polymer to absorb large quantities of energy at mmall nominal strain. The toughness compares well with the accumulated toughness of all involved layers. Possible fracture of the interface between the layers is discussed.
DOI (link to publisher's fulltext)
Host/Issue Fracture of Polymers, Composites and Adhesives II
Series/Issue European Structural Integrity Society;32
ISBN 9780080441955
Pages 355-364
Language eng (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY::Materials science
Note 3rd ESIS TC4 conference, "Fracture of Polymers, Composites and Adhesives", Les Diablerets, Switzerland 15-18 September, 2002
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