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中文核心期刊
Wei Haipeng, Han Kuoyi, Zhao Leiyang, Chen Yingyu, Yuan Kai, Kong Decai, Liu Yuanqing, Ma Guihui. Research on load reduction mechanism and water entry movement characteristics of foam head cap based on density delamination. Chinese Journal of Theoretical and Applied Mechanics, 2025, 57(4): 916-928. DOI: 10.6052/0459-1879-24-540
Citation: Wei Haipeng, Han Kuoyi, Zhao Leiyang, Chen Yingyu, Yuan Kai, Kong Decai, Liu Yuanqing, Ma Guihui. Research on load reduction mechanism and water entry movement characteristics of foam head cap based on density delamination. Chinese Journal of Theoretical and Applied Mechanics, 2025, 57(4): 916-928. DOI: 10.6052/0459-1879-24-540

RESEARCH ON LOAD REDUCTION MECHANISM AND WATER ENTRY MOVEMENT CHARACTERISTICS OF FOAM HEAD CAP BASED ON DENSITY DELAMINATION

  • Received Date: November 25, 2024
  • Accepted Date: February 16, 2025
  • Available Online: February 16, 2025
  • Published Date: February 23, 2025
  • High-speed water-entry impact load reduction and motion stabilization are the most critical challenges in the development of water-entry vehicles. A truncated cone head equipped with a density-layered crushable cap, which can absorb energy upon breakage, is one effective means of achieving both impact load reduction and motion stability. Model testing was conducted to study the interaction between high-speed water-entry cavity formation and the crushable cap, exploring the effects of density-layered caps on load reduction and motion stability. The study revealed a significant phenomenon of nested cavities in high-speed water-entry vehicles equipped with density-layered caps. The high-density cap created an upper-wide, lower-narrow nested cavity, while the forward-layered cap created an upper-narrow, lower-wide nested cavity. High stress generated by water-entry impact transmits between the two buffering layers of the density-layered cap, resulting in energy loss through collision, thereby dissipating transient impact energy. The cap fracture sequence was observed as follows: first breakage of the forward-layered cap < reverse-layered < low-density < second breakage of the forward-layered cap < high-density. The cap shape also improves motion stability, with the reverse-layered cap achieving stabilization in the shortest time. When the head cap is fractured, it induces local cavitation collapse, whereas a more intact head cap leads to the formation of stable cavitation. Additionally, the cap enhances peak speed, with the forward-layered cap condition producing the fastest entry speed, and the high-density cap condition achieving the best load reduction.
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