Deformation mechanism in compression molding of discontinuous thermoplastic composites

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    Abstract

    Processing plays a key role in determining the final properties of the product during compression molding of thermoplastic composites. In order to manufacture defect free composite products, the essential material behavior needs to be identified, modeled and characterized. This work focuses on the experimental determination of those mechanisms, that play an important role during the manufacturing of compression molded products. Chopped tapes of unidirectional carbon fiber reinforced thermoplastic composite are used for the compression molding experiments with different processing conditions. A transparent matrix is used with un-impregnated tows to visualize the deformation of flakes and movement of fluid. Experiments reveal that intra flake shear, in plane deformation of flakes (flake spreading, fiber bending) and fiber matrix separation are the dominant mechanisms. These mechanisms also show dependence on physical parameters like fiber volume fraction and fiber orientation.

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    Compression molding
    Thermoplastics
    Fibers
    Composite materials
    Fiber reinforced materials
    Processing
    Tapes
    Carbon fibers
    Volume fraction
    Compaction
    Experiments
    Defects
    Fluids

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    Ali, W., Rasheed, M. I. A., Sachs, U., Geijselaers, H. J. M., & Akkerman, R. (2018). Deformation mechanism in compression molding of discontinuous thermoplastic composites. Paper presented at 14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, Luleå, Sweden.
    Ali, W. ; Rasheed, M.I.A. ; Sachs, U. ; Geijselaers, H.J.M. ; Akkerman, R. / Deformation mechanism in compression molding of discontinuous thermoplastic composites. Paper presented at 14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, Luleå, Sweden.2 p.
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    title = "Deformation mechanism in compression molding of discontinuous thermoplastic composites",
    abstract = "Processing plays a key role in determining the final properties of the product during compression molding of thermoplastic composites. In order to manufacture defect free composite products, the essential material behavior needs to be identified, modeled and characterized. This work focuses on the experimental determination of those mechanisms, that play an important role during the manufacturing of compression molded products. Chopped tapes of unidirectional carbon fiber reinforced thermoplastic composite are used for the compression molding experiments with different processing conditions. A transparent matrix is used with un-impregnated tows to visualize the deformation of flakes and movement of fluid. Experiments reveal that intra flake shear, in plane deformation of flakes (flake spreading, fiber bending) and fiber matrix separation are the dominant mechanisms. These mechanisms also show dependence on physical parameters like fiber volume fraction and fiber orientation.",
    author = "W. Ali and M.I.A. Rasheed and U. Sachs and H.J.M. Geijselaers and R. Akkerman",
    year = "2018",
    month = "5",
    day = "30",
    language = "English",
    note = "14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, FPCM 2018 ; Conference date: 30-05-2014 Through 01-06-2018",
    url = "https://www.ltu.se/research/subjects/Stromningslara/Konferenser/FPCM-14?l=en, https://www.ltu.se/research/subjects/Stromningslara/Konferenser/FPCM-14/14th-International-Conference-on-Flow-Processes-in-Composite-Materials-30-May-1-June-2018-1.161800?l=en",

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    Ali, W, Rasheed, MIA, Sachs, U, Geijselaers, HJM & Akkerman, R 2018, 'Deformation mechanism in compression molding of discontinuous thermoplastic composites' Paper presented at 14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, Luleå, Sweden, 30/05/14 - 1/06/18, .

    Deformation mechanism in compression molding of discontinuous thermoplastic composites. / Ali, W.; Rasheed, M.I.A.; Sachs, U.; Geijselaers, H.J.M.; Akkerman, R.

    2018. Paper presented at 14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, Luleå, Sweden.

    Research output: Contribution to conferencePaper

    TY - CONF

    T1 - Deformation mechanism in compression molding of discontinuous thermoplastic composites

    AU - Ali, W.

    AU - Rasheed, M.I.A.

    AU - Sachs, U.

    AU - Geijselaers, H.J.M.

    AU - Akkerman, R.

    PY - 2018/5/30

    Y1 - 2018/5/30

    N2 - Processing plays a key role in determining the final properties of the product during compression molding of thermoplastic composites. In order to manufacture defect free composite products, the essential material behavior needs to be identified, modeled and characterized. This work focuses on the experimental determination of those mechanisms, that play an important role during the manufacturing of compression molded products. Chopped tapes of unidirectional carbon fiber reinforced thermoplastic composite are used for the compression molding experiments with different processing conditions. A transparent matrix is used with un-impregnated tows to visualize the deformation of flakes and movement of fluid. Experiments reveal that intra flake shear, in plane deformation of flakes (flake spreading, fiber bending) and fiber matrix separation are the dominant mechanisms. These mechanisms also show dependence on physical parameters like fiber volume fraction and fiber orientation.

    AB - Processing plays a key role in determining the final properties of the product during compression molding of thermoplastic composites. In order to manufacture defect free composite products, the essential material behavior needs to be identified, modeled and characterized. This work focuses on the experimental determination of those mechanisms, that play an important role during the manufacturing of compression molded products. Chopped tapes of unidirectional carbon fiber reinforced thermoplastic composite are used for the compression molding experiments with different processing conditions. A transparent matrix is used with un-impregnated tows to visualize the deformation of flakes and movement of fluid. Experiments reveal that intra flake shear, in plane deformation of flakes (flake spreading, fiber bending) and fiber matrix separation are the dominant mechanisms. These mechanisms also show dependence on physical parameters like fiber volume fraction and fiber orientation.

    M3 - Paper

    ER -

    Ali W, Rasheed MIA, Sachs U, Geijselaers HJM, Akkerman R. Deformation mechanism in compression molding of discontinuous thermoplastic composites. 2018. Paper presented at 14th International Conference on Flow Processes in Composite Materials, FPCM-14-2018, Luleå, Sweden.