Interfacial effects on the dynamic mechanical behavior of weft-knitted glass fiber fabric-reinforced polypropylene composites produced of commingled yarns. Tensile and flexural response

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Abstract

Weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets were produced by hot pressing of knit layers composed of a commingled yarn with a GF content of 70 wt.%(≈45 vol.%). The effects of fiber/matrix adhesion and reinforcing knit-induced stiffness anisotropy were characterized by dynamic-mechanical thermoanalysis (DMTA). DMTA spectra were registered under tensile and flexural loading in both course (C) and wale (W) direction of the knit. The knit structure-related stiffness anisotropy (relation of the Young's moduli measured in W- and C-directions, respectively), which proved to depend also on the loading mode of the composites, were well reflected in the DMTA spectra. The detrimental effect of poor adhesion between GF and PP could be clearly resolved when specimens cut in the C-direction were investigated. This seems to be in analogy with the transverse mechanical response of undirectional (UD) fiber-reinforced composites with interfacial variations. It was suggested that the heating-induced lofting of the composites is relied on the bond quality between GF and PP.

Original languageEnglish
Pages (from-to)209-218
Number of pages10
JournalApplied Composite Materials
Volume4
Issue number4
Publication statusPublished - 1997

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Polypropylenes
Glass fibers
Yarn
Thermoanalysis
Composite materials
Anisotropy
Adhesion
Stiffness
Fibers
Hot pressing
Elastic moduli
Heating
fiberglass
Direction compound

Keywords

  • Commingled yarn
  • Dynamic-mechanical thermal analysis (DMTA)
  • Interface
  • Knitted fabric-reinforced
  • Polypropylene (PP)
  • Stiffness anisotropy

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

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title = "Interfacial effects on the dynamic mechanical behavior of weft-knitted glass fiber fabric-reinforced polypropylene composites produced of commingled yarns. Tensile and flexural response",
abstract = "Weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets were produced by hot pressing of knit layers composed of a commingled yarn with a GF content of 70 wt.{\%}(≈45 vol.{\%}). The effects of fiber/matrix adhesion and reinforcing knit-induced stiffness anisotropy were characterized by dynamic-mechanical thermoanalysis (DMTA). DMTA spectra were registered under tensile and flexural loading in both course (C) and wale (W) direction of the knit. The knit structure-related stiffness anisotropy (relation of the Young's moduli measured in W- and C-directions, respectively), which proved to depend also on the loading mode of the composites, were well reflected in the DMTA spectra. The detrimental effect of poor adhesion between GF and PP could be clearly resolved when specimens cut in the C-direction were investigated. This seems to be in analogy with the transverse mechanical response of undirectional (UD) fiber-reinforced composites with interfacial variations. It was suggested that the heating-induced lofting of the composites is relied on the bond quality between GF and PP.",
keywords = "Commingled yarn, Dynamic-mechanical thermal analysis (DMTA), Interface, Knitted fabric-reinforced, Polypropylene (PP), Stiffness anisotropy",
author = "J. Karger-Kocsis and T. Czig{\'a}ny",
year = "1997",
language = "English",
volume = "4",
pages = "209--218",
journal = "Applied Composite Materials",
issn = "0929-189X",
publisher = "Springer Netherlands",
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T1 - Interfacial effects on the dynamic mechanical behavior of weft-knitted glass fiber fabric-reinforced polypropylene composites produced of commingled yarns. Tensile and flexural response

AU - Karger-Kocsis, J.

AU - Czigány, T.

PY - 1997

Y1 - 1997

N2 - Weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets were produced by hot pressing of knit layers composed of a commingled yarn with a GF content of 70 wt.%(≈45 vol.%). The effects of fiber/matrix adhesion and reinforcing knit-induced stiffness anisotropy were characterized by dynamic-mechanical thermoanalysis (DMTA). DMTA spectra were registered under tensile and flexural loading in both course (C) and wale (W) direction of the knit. The knit structure-related stiffness anisotropy (relation of the Young's moduli measured in W- and C-directions, respectively), which proved to depend also on the loading mode of the composites, were well reflected in the DMTA spectra. The detrimental effect of poor adhesion between GF and PP could be clearly resolved when specimens cut in the C-direction were investigated. This seems to be in analogy with the transverse mechanical response of undirectional (UD) fiber-reinforced composites with interfacial variations. It was suggested that the heating-induced lofting of the composites is relied on the bond quality between GF and PP.

AB - Weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets were produced by hot pressing of knit layers composed of a commingled yarn with a GF content of 70 wt.%(≈45 vol.%). The effects of fiber/matrix adhesion and reinforcing knit-induced stiffness anisotropy were characterized by dynamic-mechanical thermoanalysis (DMTA). DMTA spectra were registered under tensile and flexural loading in both course (C) and wale (W) direction of the knit. The knit structure-related stiffness anisotropy (relation of the Young's moduli measured in W- and C-directions, respectively), which proved to depend also on the loading mode of the composites, were well reflected in the DMTA spectra. The detrimental effect of poor adhesion between GF and PP could be clearly resolved when specimens cut in the C-direction were investigated. This seems to be in analogy with the transverse mechanical response of undirectional (UD) fiber-reinforced composites with interfacial variations. It was suggested that the heating-induced lofting of the composites is relied on the bond quality between GF and PP.

KW - Commingled yarn

KW - Dynamic-mechanical thermal analysis (DMTA)

KW - Interface

KW - Knitted fabric-reinforced

KW - Polypropylene (PP)

KW - Stiffness anisotropy

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