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This study investigates the quasi-static mechanical properties of unreinforced and VACNT-reinforced samples using uniaxial tension, double cantilever beam (DCB), and end-notched flexure (ENF) tests. The fracture surfaces from the DCB and ENF samples were examined using a scanning electron microscope to identify the toughening mechanisms. The material system employed was Solvay CYCOM® 5320–1/IM7 12 K carbon fiber/graphite-epoxy unidirectional prepreg tape, with vertical-aligned carbon nanotubes (VACNTs) obtained from NAWA technologies. The VACNTs were multi-wall carbon nanotubes (MWCNTs) with an average length of 18 ± 2 μm and diameters 46 ± 2 nm. For Mode I, VACNT-reinforced samples exhibited an 8% increase in GIC,NPC and a 14.3% increase in steady-state GIC compared to unreinforced samples. However, this increase was attributed to crack bifurcation into the intralaminar region, as evidenced by the fracture surfaces showing crack propagation at different heights. For Mode II, VACNT-reinforced samples experienced a 3% increase in GIIC,NPC and a 27% increase in GIIC,PC fracture toughness compared to unreinforced samples. Fractography analysis revealed that in these samples, the crack propagated through the interlaminar region, as evidenced by echelon cracks on the surfaces. In tension tests, VACNT-reinforced samples showed a 4% increase in stiffness (E) but an 11% decrease in ultimate tensile strength (UTS), due to manufacturing defects such as voids.

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Quasi-Static Properties of 5320–1/IM7 12 K Unidirectional Laminates Toughened with Vertically Aligned Carbon Nanotubes

  • 会议论文

  • 发表日期：

    2026年

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  • Emmanuel Vielma,
  • Vipul Ranatunga,
  • Alejandra G. Castellanos

摘要

This study investigates the quasi-static mechanical properties of unreinforced and VACNT-reinforced samples using uniaxial tension, double cantilever beam (DCB), and end-notched flexure (ENF) tests. The fracture surfaces from the DCB and ENF samples were examined using a scanning electron microscope to identify the toughening mechanisms. The material system employed was Solvay CYCOM® 5320–1/IM7 12 K carbon fiber/graphite-epoxy unidirectional prepreg tape, with vertical-aligned carbon nanotubes (VACNTs) obtained from NAWA technologies. The VACNTs were multi-wall carbon nanotubes (MWCNTs) with an average length of 18 ± 2 μm and diameters 46 ± 2 nm. For Mode I, VACNT-reinforced samples exhibited an 8% increase in GIC,NPC and a 14.3% increase in steady-state GIC compared to unreinforced samples. However, this increase was attributed to crack bifurcation into the intralaminar region, as evidenced by the fracture surfaces showing crack propagation at different heights. For Mode II, VACNT-reinforced samples experienced a 3% increase in GIIC,NPC and a 27% increase in GIIC,PC fracture toughness compared to unreinforced samples. Fractography analysis revealed that in these samples, the crack propagated through the interlaminar region, as evidenced by echelon cracks on the surfaces. In tension tests, VACNT-reinforced samples showed a 4% increase in stiffness (E) but an 11% decrease in ultimate tensile strength (UTS), due to manufacturing defects such as voids.