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    Fibre orientation structures and their effects on crack resistance of injection moulded transverse ribbed plate

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    Publication date
    2004
    Author
    Coates, Philip D.
    Caton-Rose, Philip D.
    Duckett, R.A.
    Hine, P.J.
    Keyword
    Polymer
    Orientation effects
    Reinforced plates
    Ribs (structural)
    Glass fiber reinforced plastics
    Short fibers
    Fiber orientation
    Crack tips
    Processing effects
    Injection molding
    Impact tests
    Cracking
    Impact strength
    Fracture toughness
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    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    An extensive study of the fibre orientation structures developed in a transverse ribbed plate during injection moulding, and the use of these structures to investigate the effect of local fibre orientation state on crack initiation resistance, is reported. The fibre orientation results for the ribbed plate, measured using large area image analysis system developed at Leeds University, showed that after an initial settling down period, the central core region, where the fibres are aligned perpendicular to the flow direction, decreased in size monotonically, with an associated monotonic increase in the outer shell regions, where the fibres are aligned preferentially along the injection direction. Interestingly, the level of orientation in the two regions remained almost constant: only the proportions of the two regions were found to change with flow length. Across the plate, close to the gate, the central core region was found to have a lens-like shape, while at the other end of the plate the core was thinner and also consistent in thickness across the sample width. The transverse rib was found to cause little disturbance to the fibre orientation of the base plate. The different proportions of the shell and core regions at different locations over the ribbed plate provided an ideal case to test the proposition of Friedrich that the crack resistance of a short fibre reinforced material depends on the number of fibres that are perpendicular to the crack tip. The impact test results gathered in this way confirmed this hypothesis of Friedrich.
    URI
    http://hdl.handle.net/10454/2780
    Version
    No full-text available in the repository
    Citation
    Coates PD, Caton-Rose PD, Duckett RA and Hine PJ (2004) Fibre orientation structures and their effects on crack resistance of injection moulded transverse ribbed plate. Plastics Rubber and Composites. 33(1): 43-53.
    Link to publisher’s version
    http://www.ingentaconnect.com/content/maney/prc/2004/00000033/00000001/art00008;jsessionid=13lt0rq4ij4m6.victoria
    Type
    Article
    Collections
    Engineering and Informatics Publications

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