X-ray computed tomography characterization of manufacturing induced defects in a glass/polyester pultruded profile

Ismet Baran (Corresponding Author), Ilya Straumit, Oksana Shishkina, Stepan V. Lomov

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    Critical assessment of the internal geometry after manufacturing of fiber reinforced polymer composites is essential for developing more reliable and robust production. In the present work, manufacturing induced defects such as fiber misalignment and porosity in a glass/polyester pultruded composite profile are evaluated. The internal geometry of the composite is characterized by X-ray micro-computed tomography (micro-CT) and analyzed using the VoxTex software which allows validated and detailed characterization of the internal geometry. Resin rich areas are observed in between the glass rovings at which the unidirectional fibers are misaligned with respect to the desired pulling direction. Results show that the misalignment in in-plane fiber orientation is more severe (30–40°) than the out-plane fiber orientation (10–20°). Two different types of porosities are quantified: the first one is discontinuous and located inside the resin rich areas; the second one is more severe and continuously located between the glass rovings. The area of the total continuous porosity is estimated approximately as 0.212–0.246 mm2 per unit length in the pulling direction. The fiber misalignments and resin rich areas cause 15–20% reduction in the studied part stiffness in the longitudinal direction.
    Original languageEnglish
    Pages (from-to)74-82
    Number of pages9
    JournalComposite structures
    Volume195
    DOIs
    Publication statusPublished - 1 Jul 2018

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    Polyesters
    Tomography
    X rays
    Glass
    Defects
    Resins
    Fibers
    Porosity
    Fiber reinforced materials
    Geometry
    Composite materials
    Polymers
    Stiffness
    Direction compound

    Cite this

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    title = "X-ray computed tomography characterization of manufacturing induced defects in a glass/polyester pultruded profile",
    abstract = "Critical assessment of the internal geometry after manufacturing of fiber reinforced polymer composites is essential for developing more reliable and robust production. In the present work, manufacturing induced defects such as fiber misalignment and porosity in a glass/polyester pultruded composite profile are evaluated. The internal geometry of the composite is characterized by X-ray micro-computed tomography (micro-CT) and analyzed using the VoxTex software which allows validated and detailed characterization of the internal geometry. Resin rich areas are observed in between the glass rovings at which the unidirectional fibers are misaligned with respect to the desired pulling direction. Results show that the misalignment in in-plane fiber orientation is more severe (30–40°) than the out-plane fiber orientation (10–20°). Two different types of porosities are quantified: the first one is discontinuous and located inside the resin rich areas; the second one is more severe and continuously located between the glass rovings. The area of the total continuous porosity is estimated approximately as 0.212–0.246 mm2 per unit length in the pulling direction. The fiber misalignments and resin rich areas cause 15–20{\%} reduction in the studied part stiffness in the longitudinal direction.",
    author = "Ismet Baran and Ilya Straumit and Oksana Shishkina and Lomov, {Stepan V.}",
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    doi = "10.1016/j.compstruct.2018.04.030",
    language = "English",
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    X-ray computed tomography characterization of manufacturing induced defects in a glass/polyester pultruded profile. / Baran, Ismet (Corresponding Author); Straumit, Ilya; Shishkina, Oksana; Lomov, Stepan V.

    In: Composite structures, Vol. 195, 01.07.2018, p. 74-82.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - X-ray computed tomography characterization of manufacturing induced defects in a glass/polyester pultruded profile

    AU - Baran, Ismet

    AU - Straumit, Ilya

    AU - Shishkina, Oksana

    AU - Lomov, Stepan V.

    PY - 2018/7/1

    Y1 - 2018/7/1

    N2 - Critical assessment of the internal geometry after manufacturing of fiber reinforced polymer composites is essential for developing more reliable and robust production. In the present work, manufacturing induced defects such as fiber misalignment and porosity in a glass/polyester pultruded composite profile are evaluated. The internal geometry of the composite is characterized by X-ray micro-computed tomography (micro-CT) and analyzed using the VoxTex software which allows validated and detailed characterization of the internal geometry. Resin rich areas are observed in between the glass rovings at which the unidirectional fibers are misaligned with respect to the desired pulling direction. Results show that the misalignment in in-plane fiber orientation is more severe (30–40°) than the out-plane fiber orientation (10–20°). Two different types of porosities are quantified: the first one is discontinuous and located inside the resin rich areas; the second one is more severe and continuously located between the glass rovings. The area of the total continuous porosity is estimated approximately as 0.212–0.246 mm2 per unit length in the pulling direction. The fiber misalignments and resin rich areas cause 15–20% reduction in the studied part stiffness in the longitudinal direction.

    AB - Critical assessment of the internal geometry after manufacturing of fiber reinforced polymer composites is essential for developing more reliable and robust production. In the present work, manufacturing induced defects such as fiber misalignment and porosity in a glass/polyester pultruded composite profile are evaluated. The internal geometry of the composite is characterized by X-ray micro-computed tomography (micro-CT) and analyzed using the VoxTex software which allows validated and detailed characterization of the internal geometry. Resin rich areas are observed in between the glass rovings at which the unidirectional fibers are misaligned with respect to the desired pulling direction. Results show that the misalignment in in-plane fiber orientation is more severe (30–40°) than the out-plane fiber orientation (10–20°). Two different types of porosities are quantified: the first one is discontinuous and located inside the resin rich areas; the second one is more severe and continuously located between the glass rovings. The area of the total continuous porosity is estimated approximately as 0.212–0.246 mm2 per unit length in the pulling direction. The fiber misalignments and resin rich areas cause 15–20% reduction in the studied part stiffness in the longitudinal direction.

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