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<p>As polyurea materials are largely applied in the field of engineering protection, the structural impact resistance of polyurea materials has gradually received widespread attention. Many studies have been conducted on the resistance of polyurea to high-velocity ballistic impacts. However, few studies have focused on the low-velocity impacts resistance of material. In this paper, we focused on the mechanical behavior of polyurea composite steel sheets under rigid drop hammer impact. We first systematically investigated the effects of polyurea spraying form, coating thickness, and drop loading energy on the impact resistance of composite structures by the drop hammer impact test. On this basis, the damage mechanism and energy absorption characteristics of coating structure were further investigated using numerical calculation. In addition, we obtained the physical relationship between coating thickness, drop hammer loading energy, and steel plate displacement by nonlinear fitting method. The study results showed that the polyurea coating was effective in reducing permanent residual deformation of the metal substrate, and the back coating configuration provided the best improvement effect. And this improvement effect will strengthen with the increase in coating thickness. With increasing drop hammer impact loading energy, the energy absorption effect of polyurea material will be more fully utilized and gradually became the main body of structural energy absorption. The presence of polyurea effectively transferred the impact energy of the surface steel plate, blocked the expansion of initial cracks in the steel plate, and played a better role in delaying the overall damage to the structure. Based on the analysis of structural specific energy absorption per unit surface density, we found that the polyurea materials consistently demonstrated higher energy absorption efficiency than metallic steel plates, resulting in a good and positive effect on the future modification of impact resistance of metallic substrates, such as steel plates.</p>

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Investigation on Low-Velocity Drop Impact Resistance and Protection Mechanism of Polyurea Reinforced Steel Composite Structures

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Jiahao He,
  • Weiwei Qin,
  • Yong Liu,
  • Wei He,
  • Dawei Pi,
  • Tiaoqi Fu,
  • Xianhui Wang,
  • Xiaowang Sun,
  • Kun Wu

摘要

As polyurea materials are largely applied in the field of engineering protection, the structural impact resistance of polyurea materials has gradually received widespread attention. Many studies have been conducted on the resistance of polyurea to high-velocity ballistic impacts. However, few studies have focused on the low-velocity impacts resistance of material. In this paper, we focused on the mechanical behavior of polyurea composite steel sheets under rigid drop hammer impact. We first systematically investigated the effects of polyurea spraying form, coating thickness, and drop loading energy on the impact resistance of composite structures by the drop hammer impact test. On this basis, the damage mechanism and energy absorption characteristics of coating structure were further investigated using numerical calculation. In addition, we obtained the physical relationship between coating thickness, drop hammer loading energy, and steel plate displacement by nonlinear fitting method. The study results showed that the polyurea coating was effective in reducing permanent residual deformation of the metal substrate, and the back coating configuration provided the best improvement effect. And this improvement effect will strengthen with the increase in coating thickness. With increasing drop hammer impact loading energy, the energy absorption effect of polyurea material will be more fully utilized and gradually became the main body of structural energy absorption. The presence of polyurea effectively transferred the impact energy of the surface steel plate, blocked the expansion of initial cracks in the steel plate, and played a better role in delaying the overall damage to the structure. Based on the analysis of structural specific energy absorption per unit surface density, we found that the polyurea materials consistently demonstrated higher energy absorption efficiency than metallic steel plates, resulting in a good and positive effect on the future modification of impact resistance of metallic substrates, such as steel plates.