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<p>The automotive energy-absorbing box can significantly reduce impact energy during accidental collisions, thereby protecting the lives of passengers and minimizing damage to the main components of the vehicle. However, it is often exposed to a hot and humid environment. Therefore, research on the ability of the automotive energy-absorbing box to resist thermal and humid erosion is necessary. This work investigates the crashworthiness of biomimetic composite thin-walled tubes under quasi-static axial crushing, focusing on the effect of hot water treatment. The thin-walled tubes, inspired by honeycomb structures, were manufactured using carbon fiber composites through a multi-cavity preform mold method. Three-point bending tests and interlaminar shear tests were carried out to identify the effect of hot water on the mechanical response of the unidirectional composites and the Lap-shear Strength between layers. Quasi-static crushing tests and CT scanning observation were conducted to characterize the mechanical behavior, crashworthiness mechanisms, and energy absorption capacity of the thin-walled tubes. Results indicate that, following hot water treatment, the flexural strength of the composite material decreased by 57.3%, while the Lap-shear Strength was reduced by 23.65% to 29.94%. Correspondingly, the crush performance of the biomimetic CFRP thin-walled tubes was reduced to varying extents: total energy absorption (<i>EA</i>) fell by 7.48%–39.16% and the initial peak force (<i>F</i><sub><i>ip</i></sub>) by 13.19%–30.21%. The crushing performance of thin-walled tubes with Geometric Structure C and 90° oriented carbon fibers is less affected by hot water treatment. Despite these reductions, all tubes retained a stable progressive crushing mode, and the energy absorption mechanism underwent significant changes compared to before hot water treatment. These findings provide valuable insights for designing durable and reliable composite structure for safety-critical applications in industries such as automotive and aerospace.</p>

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Effect of Hot Water on the Crashworthiness of Honeycomb-Inspired Composite Thin-Walled Tubes

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Kangyi Feng,
  • Tengda Wang,
  • Linhai Wang,
  • Guangyan Wei,
  • Hang Yu,
  • Wei Wang,
  • Qingsong Wei,
  • Guangtao Liu,
  • Xuefeng Yan,
  • Yue Shen,
  • Lu Yao,
  • Yan Ma,
  • Qunren Qiu

摘要

The automotive energy-absorbing box can significantly reduce impact energy during accidental collisions, thereby protecting the lives of passengers and minimizing damage to the main components of the vehicle. However, it is often exposed to a hot and humid environment. Therefore, research on the ability of the automotive energy-absorbing box to resist thermal and humid erosion is necessary. This work investigates the crashworthiness of biomimetic composite thin-walled tubes under quasi-static axial crushing, focusing on the effect of hot water treatment. The thin-walled tubes, inspired by honeycomb structures, were manufactured using carbon fiber composites through a multi-cavity preform mold method. Three-point bending tests and interlaminar shear tests were carried out to identify the effect of hot water on the mechanical response of the unidirectional composites and the Lap-shear Strength between layers. Quasi-static crushing tests and CT scanning observation were conducted to characterize the mechanical behavior, crashworthiness mechanisms, and energy absorption capacity of the thin-walled tubes. Results indicate that, following hot water treatment, the flexural strength of the composite material decreased by 57.3%, while the Lap-shear Strength was reduced by 23.65% to 29.94%. Correspondingly, the crush performance of the biomimetic CFRP thin-walled tubes was reduced to varying extents: total energy absorption (EA) fell by 7.48%–39.16% and the initial peak force (Fip) by 13.19%–30.21%. The crushing performance of thin-walled tubes with Geometric Structure C and 90° oriented carbon fibers is less affected by hot water treatment. Despite these reductions, all tubes retained a stable progressive crushing mode, and the energy absorption mechanism underwent significant changes compared to before hot water treatment. These findings provide valuable insights for designing durable and reliable composite structure for safety-critical applications in industries such as automotive and aerospace.