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<p>This study prepared three-dimensional orthogonal jute/basalt composites with varying weft mixing ratios via vacuum-assisted resin transfer molding (VARTM). The composites were subsequently immersed in distilled water at two temperatures (25&#xa0;°C and 65&#xa0;°C) for up to 90 days.Moisture absorption tests and low-velocity impact (LVI) tests were performed on hygrothermal-treated composites, with damage morphologies characterized using optical microscopy and scanning electron microscopy (SEM). Results showed that moisture absorption rate of composites increased with jute content. Among all specimens, the pure jute composite specimen ([7J]) showed the highest moisture absorption rate, while the pure basalt composite specimen ([7B]) demonstrated the lowest. Elevated temperature accelerated moisture diffusion and matrix degradation, while fiber arrangement also affected moisture absorption performance. Hygrothermal aging degraded LVI performance: after 90-day aging at 65&#xa0;°C, peak load of the jute/basalt weft-alternating hybrid composite specimen ([4B3J]) specimens decreased by 38.01% and energy absorption reduced by 24%, attributed to matrix hydrolysis, fiber-matrix interface debonding, and microcrack propagation. Damage analysis revealed that specimens with higher jute content experienced more severe fracture and delamination, with aging exacerbating the “I”-shaped back surface damage. This study provides theoretical guidance for engineering applications of natural fiber hybrid composites in hygrothermal environments.</p>

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Hygrothermal Aging Effects on Low-Velocity Impact Resistance of 3D Orthogonal Jute/Basalt Hybrid Woven Composites

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Xin Sun,
  • Jiaxuan Wang,
  • Yiwei Ouyang,
  • Xiaoke Huang,
  • Xiaonan Wang,
  • Yiran Han,
  • Yang Liu,
  • Xiaozhou Gong

摘要

This study prepared three-dimensional orthogonal jute/basalt composites with varying weft mixing ratios via vacuum-assisted resin transfer molding (VARTM). The composites were subsequently immersed in distilled water at two temperatures (25 °C and 65 °C) for up to 90 days.Moisture absorption tests and low-velocity impact (LVI) tests were performed on hygrothermal-treated composites, with damage morphologies characterized using optical microscopy and scanning electron microscopy (SEM). Results showed that moisture absorption rate of composites increased with jute content. Among all specimens, the pure jute composite specimen ([7J]) showed the highest moisture absorption rate, while the pure basalt composite specimen ([7B]) demonstrated the lowest. Elevated temperature accelerated moisture diffusion and matrix degradation, while fiber arrangement also affected moisture absorption performance. Hygrothermal aging degraded LVI performance: after 90-day aging at 65 °C, peak load of the jute/basalt weft-alternating hybrid composite specimen ([4B3J]) specimens decreased by 38.01% and energy absorption reduced by 24%, attributed to matrix hydrolysis, fiber-matrix interface debonding, and microcrack propagation. Damage analysis revealed that specimens with higher jute content experienced more severe fracture and delamination, with aging exacerbating the “I”-shaped back surface damage. This study provides theoretical guidance for engineering applications of natural fiber hybrid composites in hygrothermal environments.