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

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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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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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