&lt;title&gt;In-situ SEM study of fracture of an ultrathin Al-foil-modeling of the fracture processes&lt;/title&gt;

Kao-Walter, Sharon; Ståhle, Per

doi:10.1117/12.468836

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…This phenomenon has been interpreted at the light of brittle or quasi-brittle fracture models in [2][3][4][5], consistently with the smaller rupture strain and meaningful reduction of toughness exhibited by free-standing thin metal foils compared to the corresponding bulk materials [6,7]. However, fractographical examinations reported in [8] suggest that the material separation may be rather produced by necking, in other words, by a typical elastic-plastic phenomenon. Thus, the decay of the nominal material properties may be attributed to the localization of plastic deformation in narrow bands, induced by stress concentration in correspondence of some imperfection, rather than to the constitutive softening usually associated to grain boundary cracking or cleavage.…”

Section: Figure 1 Typical Composition and Functionality Of Beverage supporting

confidence: 57%

Aluminum Laminates in Beverage Packaging: Models and Experiences

et al. 2015

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Aluminum laminates are among the main components of beverage packaging. These layered material systems are coupled to paperboard plies except in the cap opening area, where the human force limit sets a requirement on the material properties to allow open-ability and the mechanical characteristics are of particular interest. Experimental investigations have been carried out on this composite and on its components by either traditional or full-field measurement techniques. The interpretation of the collected data has been supported by the simulation of the performed tests considering either a homogenized material model or the individual laminate layers. However, different results may be recovered from similar samples due to physical factors like the material processing route and the embedded defectiveness. In turn, the conclusions may vary depending on the model assumptions. This contribution focuses on the physical effects and on the modeling of the large localized deformation induced by material singularities. This topic is discussed at the light of some experimental results.

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Section: Figure 1 Typical Composition and Functionality Of Beverage supporting

confidence: 57%

Aluminum Laminates in Beverage Packaging: Models and Experiences

et al. 2015

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“…The material properties are taken from [1] and [2]. To simplify the analyses the materials are approximated as perfectly plastic with the following properties for the aluminium foil, the modulus of elasticity E = 34 GPa and the yield stress σ o = 49 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…This is a laminate consisting of LDPE (Low Density Polyethylene) and an aluminium foil. Several studies of different mechanical properties of these materials have been performed [1][2][3][4][5]. It was found in [2] that aluminium foil and LDPE laminated together provide significantly higher stress and strain at fracture as compared with the simplified analytical prediction.…”

Section: Introductionmentioning

confidence: 99%

Fracture Mechanisms of a Thin Elastic Plastic Laminate

Bjerkén

Kao-Walter

Ståhle

Fracture of Nano and Engineering Materials and Structures

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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 small nominal strain. The toughness compares well with the accumulated toughness of all involved layers. Possible fracture of the interface between the layers is discussed.

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