A comparison of the mechanical behaviour of weft-knitted glass and carbon fiber fabric-reinforced polyamide-12 composites produced with commingled staple yarns

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Abstract

The mechanical response of knitted glass- (GF) and carbon fiber (CF) fabric-reinforced polyamide-12 (PA-12) composites was compared both under static (tensile, flexural) and dynamic (perforation impact) conditions. The GF- and CF-content of the composites produced by hot pressing of 8 layers of planar weft knits containing staple reinforcing GF or CF and PA-12 fibers was practically the same, viz ca. 50 vol%. Dynamic-mechanical thermoanalysis (DMTA) showed a strong stiffness anisotropy: the stiffness of the composites in the wale-direction (W) was markedly higher than in the course-direction (C). The same strong anisotropy was also found for the static tensile and flexural characteristics (stiffness and strength). The mechanical anistropy and the large difference between the stiffness and strength due to tensile and flexural loading were traced to the structure of the knits ("unbalanced" reinforcement) and their non-planar structure in the composite sheets. The mechanical performance of the knitted CF-reinforced composite was superior to the GF-reinforced version under dynamic perforation impact conditions as well.

Original languageEnglish
Pages (from-to)491-497
Number of pages7
JournalPolymers and Polymer Composites
Volume9
Issue number8
Publication statusPublished - 2001

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Polyamides
Glass fibers
Carbon fibers
Yarn
Stiffness
Composite materials
Anisotropy
Hot pressing
Thermoanalysis
Reinforcement
carbon fiber
fiberglass
nylon 12
Fibers
Direction compound

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Ceramics and Composites
  • Materials Chemistry
  • Polymers and Plastics

Cite this

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abstract = "The mechanical response of knitted glass- (GF) and carbon fiber (CF) fabric-reinforced polyamide-12 (PA-12) composites was compared both under static (tensile, flexural) and dynamic (perforation impact) conditions. The GF- and CF-content of the composites produced by hot pressing of 8 layers of planar weft knits containing staple reinforcing GF or CF and PA-12 fibers was practically the same, viz ca. 50 vol{\%}. Dynamic-mechanical thermoanalysis (DMTA) showed a strong stiffness anisotropy: the stiffness of the composites in the wale-direction (W) was markedly higher than in the course-direction (C). The same strong anisotropy was also found for the static tensile and flexural characteristics (stiffness and strength). The mechanical anistropy and the large difference between the stiffness and strength due to tensile and flexural loading were traced to the structure of the knits ({"}unbalanced{"} reinforcement) and their non-planar structure in the composite sheets. The mechanical performance of the knitted CF-reinforced composite was superior to the GF-reinforced version under dynamic perforation impact conditions as well.",
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issn = "0967-3911",
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T1 - A comparison of the mechanical behaviour of weft-knitted glass and carbon fiber fabric-reinforced polyamide-12 composites produced with commingled staple yarns

AU - Czigány, T.

AU - Karger-Kocsis, J.

PY - 2001

Y1 - 2001

N2 - The mechanical response of knitted glass- (GF) and carbon fiber (CF) fabric-reinforced polyamide-12 (PA-12) composites was compared both under static (tensile, flexural) and dynamic (perforation impact) conditions. The GF- and CF-content of the composites produced by hot pressing of 8 layers of planar weft knits containing staple reinforcing GF or CF and PA-12 fibers was practically the same, viz ca. 50 vol%. Dynamic-mechanical thermoanalysis (DMTA) showed a strong stiffness anisotropy: the stiffness of the composites in the wale-direction (W) was markedly higher than in the course-direction (C). The same strong anisotropy was also found for the static tensile and flexural characteristics (stiffness and strength). The mechanical anistropy and the large difference between the stiffness and strength due to tensile and flexural loading were traced to the structure of the knits ("unbalanced" reinforcement) and their non-planar structure in the composite sheets. The mechanical performance of the knitted CF-reinforced composite was superior to the GF-reinforced version under dynamic perforation impact conditions as well.

AB - The mechanical response of knitted glass- (GF) and carbon fiber (CF) fabric-reinforced polyamide-12 (PA-12) composites was compared both under static (tensile, flexural) and dynamic (perforation impact) conditions. The GF- and CF-content of the composites produced by hot pressing of 8 layers of planar weft knits containing staple reinforcing GF or CF and PA-12 fibers was practically the same, viz ca. 50 vol%. Dynamic-mechanical thermoanalysis (DMTA) showed a strong stiffness anisotropy: the stiffness of the composites in the wale-direction (W) was markedly higher than in the course-direction (C). The same strong anisotropy was also found for the static tensile and flexural characteristics (stiffness and strength). The mechanical anistropy and the large difference between the stiffness and strength due to tensile and flexural loading were traced to the structure of the knits ("unbalanced" reinforcement) and their non-planar structure in the composite sheets. The mechanical performance of the knitted CF-reinforced composite was superior to the GF-reinforced version under dynamic perforation impact conditions as well.

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