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  • 1.
    Andreasson, Eskil
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Mehmood, Nasir
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Mao, Tan
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    An Experimental, Numerical and SEM Study of Fracture in a Thin Polymer Film2014In: MATERIALS STRUCTURE & MICROMECHANICS OF FRACTURE VII, Trans Tech Publications Inc., 2014, Vol. 592-593, p. 225-+-Conference paper (Refereed)
    Abstract [en]

    Observations and analysis of samples from scanning electron microscopic (SEM) micrographs has been concerned in this work. The samples originate from fractured mechanical mode I tensile testing of a thin polymer film made of polypropylene used in the packaging industry. Three different shapes of the crack; elliptical, circular and flat, were used to investigate the decrease in load carrying capacity. The fracture surfaces looked similar in all studied cases. Brittle-like material fracture process was observed both by SEM micrographs and the experimental mechanical results. A finite element model was created in Abaqus as a complementary tool to increase the understanding of the mechanical behaviour of the material. The numerical material models were calibrated and the results from the simulations were comparable to the experimental results.

  • 2.
    Andreasson, Eskil
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Mehmood, Nasir
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Mao, Tan
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Kao-Walter, Sharon
    Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
    Experimental and Numerical fracture of cracks emanating from different types of flaws in thin polymer films2013Conference paper (Refereed)
    Abstract [en]

    Fracture mechanical Mode I tensile testing has been performed on an oriented polyproplyne film used in packaging industry. Physical Tensile testing for the continuum material has been performed to observe the material strength and to extract continuum material properties for numerical analysis. Fracture mechanical testing of different shaped notches is performed to observe the failure initiation in the material. A brittle-like failure was shown in the polypropylene film while the low density polyethylene presented a highly ductile behavior. A finite element method (FEM) strategy has been successfully developed to perform numerical analysis of polymer films. The developed FEM model gives an accurate and approximate method to compare and analyze the experimental and numerical results. The obtained results have shown a very fine similarity under theoretical, experimental and numerical analysis. Depending on crack geometry different shape crack effects showed the transferability of localized stresses at different points around the crack. Fracture surface and fracture process is analyzed using scanning electron microscope (SEM). Brittle failure with small deformation and presence of small voids and their coalescence has also been shown in SEM micrographs for LDPE material. The methods discussed will help classify different groups of materials and can be used as a predictive tool for the crack initiation and crack propagation path in packaging material, especially thin polymer films.

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