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This study investigates the flexural properties of unreinforced and VACNT-reinforced samples for two different configurations: Configuration 1 (a complete strand used at the top surface) and Configuration 2 (the top surface consists of half of one strand and half of another strand). A fractography analysis was performed at the cross-section and post-mortem using a scanning electron microscope (SEM) to identify the manufacturing defects. The material system employed was Solvay CYCOM® 5320-1/IM7 12K carbon fiber/graphite-epoxy unidirectional (UD) prepreg strands, 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. The VACNT-reinforced samples exhibited ductile failure, while the unreinforced samples showed brittle behavior. For the unreinforced samples, Configuration 2 showed a 30% decrease in flexural stiffness, a 42% increase in flexural strength, and a 28% increase in failure strain compared to Configuration 1. For the VACNT-reinforced samples, Configuration 2 showed a 42% increase in flexural stiffness, a 24% increase in flexural strength, and a 19% decrease in failure strain compared to Configuration 1. Additionally, the unreinforced samples experienced more catastrophic failure than the VACNT-reinforced samples.

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Elucidating the Effect of Vertical Aligned Carbon Nanotubes on the Progressive Failure of Tow-Based Discontinuous Composites

  • 会议论文

  • 发表日期：

    2026年

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  • Daniela Garcia,
  • Luca Sacchetto,
  • Paulina Diaz-Montiel,
  • Alejandra G. Castellanos

摘要

This study investigates the flexural properties of unreinforced and VACNT-reinforced samples for two different configurations: Configuration 1 (a complete strand used at the top surface) and Configuration 2 (the top surface consists of half of one strand and half of another strand). A fractography analysis was performed at the cross-section and post-mortem using a scanning electron microscope (SEM) to identify the manufacturing defects. The material system employed was Solvay CYCOM® 5320-1/IM7 12K carbon fiber/graphite-epoxy unidirectional (UD) prepreg strands, 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. The VACNT-reinforced samples exhibited ductile failure, while the unreinforced samples showed brittle behavior. For the unreinforced samples, Configuration 2 showed a 30% decrease in flexural stiffness, a 42% increase in flexural strength, and a 28% increase in failure strain compared to Configuration 1. For the VACNT-reinforced samples, Configuration 2 showed a 42% increase in flexural stiffness, a 24% increase in flexural strength, and a 19% decrease in failure strain compared to Configuration 1. Additionally, the unreinforced samples experienced more catastrophic failure than the VACNT-reinforced samples.