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  • 1.
    Kao-Walter, Sharon
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Hu, Min
    Walter, Mats
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Leon, Armando
    A Comparison of 2-zone and 3-zone Models in Tearing based on Essential Work of Fracture2009Conference paper (Refereed)
    Abstract [en]

    Two different models (2-zone and 3-zone) for describing the deformation and fracture behavior of tearing ligament was compared and discussed based on the experimental results made by Kim et al. The models are based on the Essential Work of Fracture approach for predicting the specific total work of fracture along the tear path across plastic zones. The experiment and analysis were based on 2-leg trousers tear specimen. The materials chosen in this work were PET (0.508 mm). The results showed that the accuracy of 3-zone model was higher than 2-zone model. It was found that this difference is because the 2-zone model did not consider the plastic deformation caused by loading prior to tearing. Also a finite element model was created to simulate the behavior around the crack tip.

  • 2. Kao-Walter, Sharon
    et al.
    Levin, M.L.
    Petronyuk, J.S.
    Walter, Mats
    Acoustic imaging internal microstructure of a packaging material2008Conference paper (Refereed)
    Abstract [en]

    Microstructure of a paper-based packaging material was studied by acoustic microscopy method. The laminate structure of the packaging material contains paperboard, polymer and aluminium, which are widely used for aseptic liquid food package. The method has also been used to detect delaminations inside the material. The results show the possibility to study the micro structural features of paperboard, polymer and aluminium foil layered materials by applying the high-resolution ultrasonic acoustic microscopy. The potential for visualization defects in the body of this kind of materials is discussed in order to further develop the Non-Destructive Testing (NDT) method in food packaging industries.

  • 3. Kao-Walter, Sharon
    et al.
    Walter, Mats
    Dasari, A
    Leon, Armando
    Tearing and Delaminating of a Polymer Laminate2011In: Key Engineering Materials, ISSN 1013-9826, Vol. 465, p. 169-174Article in journal (Refereed)
    Abstract [en]

    The fracture behaviour of laminated materials was studied in this work. The materials used in this work were low-density polyethylene (LDPE) laminated on polyethylene (PET). The thickness of the LDPE was 27 μm and the PET was 100 μm. Experiments were performed by using a 2-leg trousers specimen to analyse the tearing behaviour of the laminate in relation to the delamination. A clear delamination zone was observed during the crack propagation by tearing. Furthermore, a finite element calculation was performed to simulate the behavior around the crack tip during the tearing. A correlation between adhesion and crack propagation was discussed. Finally, the theory of Essential Work of Fracture (EWF) was used for predicting the specific total work of fracture along the tear path across the plastic zones.

  • 4. Kao-Walter, Sharon
    et al.
    Walter, Mats
    Muhammadi, A.B.
    Tensile and Tearing Fracture Behaviour of Food Packaging Laminate2007Conference paper (Other academic)
    Abstract [en]

    Fracture behaviour of laminated food packaging materials is studied. The materials used in this work were the single layer of Aluminium foil (Al-foil), Low density polyethylene (LDPE) and the lamination of these single layers. Experiments were performed by applying the centred crack specimen as well as the 2-leg trousers specimen. It was observed that the load carrying capacity increased for the tensile and decreased for the tearing specimen when the two layers are laminated together. It was also found that in the case of tearing the crack growth was not only initiated by shear stress but also by normal stress. A modified strip yield model and the essential work of fracture theory were used to analyze the deformation and the fracture behaviour. The initial crack growth of the single layers and the laminate during the tensile and tearing were compared and investigated.

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