Title: FRACTURE TOUGHNESS OF DISCONTINUOUS LONG GLASS FIBER REINFORCED POLYPROPYLENE: AN APPROACH BASED ON A NUMERICAL PREDICTION OF FIBER ORIENTATION IN INJECTION MOLDING
Page Range: p.121-130
Author(s): Rizov V; Harmia T; Reinhardt A; Friedrich K
File size: 467K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 2
Abstract
The fracture toughness of discontinuous long glass fibre reinforced injection moulded polypropylene was characterised using the microstructural efficiency concept in combination with a numerical prediction of the fibre orientation during injection moulding, using Sigmasoft commercial computer software. In a three-dimensional numerical scheme, fibre volume fractions, shear viscosity and mean fibre aspect ratio data were input in order to perform a mould filling analysis. The resultant local fibre orientation parameters for injection moulded square plates of long glass fibre reinforced PP permitted the calculation of the local fracture toughness using the microstructural efficiency concept. This was compared with the experimental toughness values obtained by the use of compact tension test specimens. A good correlation between the calculated fracture toughness data and the measured ones was reported to indicate that a fibre orientation prediction by the Sigmasoft finite element computer code, could be used in combination with the microstructural efficiency concept for the determination of local fracture toughness values in injection moulded long glass fibre reinforced thermoplastics. It is claimed that this combined approach provides good opportunities for the optimisation of a thermoplastic workpiece in its design with respect to local fracture resistance, which will in turn provide extended areas of application within the engineering sector. 13 refs.
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