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The demand for flexible, lightweight body armor made with Ultra-High Molecular Weight Polyethylene (UHMWPE) is in an uptrend due to its superior specific properties. This research aims at evaluating the low velocity impact (LVI) performance of the UHMWPE samples with and without nanofiller additions. In this study, UHMWPE prepreg sheets were spray-coated with 1 wt% of multi-walled carbon nanotubes (MWCNT) and then compared against pristine samples (without CNT). Both sample configurations consisted of five sheet plies and impacted at an energy of 21 J using a drop weight instrument. Following the tests, the microstructural evolutions were carried out using X-ray computed tomography (XCT) to capture the damaged area and volume fractions in the impact-tested samples. The results showed that the addition of CNT increased the maximum force and elastic stiffness by 4% and 21%, respectively, while decreasing the displacement by 8% compared to the pristine UHMWPE sample. Moreover, it was observed from the XCT-aided geometrical models that the damage area fraction and the damage volume fraction decreased by 35% and 40%, respectively, with the addition of 1 wt% of CNT in the UHMWPE sample compared to the pristine sample. The enhancement in force and impact damage resistance could be attributed to the increase in the interfacial bonding between the layers of the composite.

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Quantifying Low-Velocity Impact Damage of UHMWPE/CNT Composites Qualitatively Using X-ray Computed Tomography

  • 会议论文

  • 发表日期：

    2025年

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  • Omar Banabila,
  • Haleimah Alabdouli,
  • Kakur Naresh,
  • Abdullah Alshehhi,
  • Alia Aziz,
  • Monserrat Gutierrez,
  • Henrique Ramos,
  • Alexander Eggeman,
  • Zhongwei Guan,
  • Rafael Santiago

摘要

The demand for flexible, lightweight body armor made with Ultra-High Molecular Weight Polyethylene (UHMWPE) is in an uptrend due to its superior specific properties. This research aims at evaluating the low velocity impact (LVI) performance of the UHMWPE samples with and without nanofiller additions. In this study, UHMWPE prepreg sheets were spray-coated with 1 wt% of multi-walled carbon nanotubes (MWCNT) and then compared against pristine samples (without CNT). Both sample configurations consisted of five sheet plies and impacted at an energy of 21 J using a drop weight instrument. Following the tests, the microstructural evolutions were carried out using X-ray computed tomography (XCT) to capture the damaged area and volume fractions in the impact-tested samples. The results showed that the addition of CNT increased the maximum force and elastic stiffness by 4% and 21%, respectively, while decreasing the displacement by 8% compared to the pristine UHMWPE sample. Moreover, it was observed from the XCT-aided geometrical models that the damage area fraction and the damage volume fraction decreased by 35% and 40%, respectively, with the addition of 1 wt% of CNT in the UHMWPE sample compared to the pristine sample. The enhancement in force and impact damage resistance could be attributed to the increase in the interfacial bonding between the layers of the composite.