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<p>With the development of lightweight, titanium alloys are widely used in ships and marine engineering, and the crashworthiness of ship structures has a great impact on ship safety. Taking the side structure of Ti-6Al-4&#xa0;V titanium alloy as the research object, the improved GISSMO damage model is introduced into the low-speed impact assessment of titanium alloy ships for the first time to overcome the limitations of the traditional model Johnson-Cook in capturing the unique “shear-necking” coupling failure mode of Ti-6Al-4&#xa0;V. Through the ductile fracture tensile test and numerical simulation calibration under complex stress state and deformation mode, the stress triaxial dependent failure curve of Ti-6Al-4&#xa0;V is constructed and combined with the mixed hardening constitutive model. The horizontal low-speed impact test platform and LS-DYNA simulation software are used to verify the accuracy of damage assessment and evaluate the damage mode of Ti-6Al-4&#xa0;V under low-speed impact with different failure criteria, and the fitting accuracy of Johnson-Cook criterion is compared and analyzed. On this basis, the collision finite element simulation of the titanium alloy ship’s side structure is carried out, and the influence of different impact positions and different impact angles on the ship’s side structure is analyzed. Finally, the damage law of the ship’s collision is obtained, and the damage characteristics of the side structure under collision are revealed, which provides reference for the evaluation and optimization of the impact resistance of titanium alloy ship’s structure.</p>

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Bearing characteristics analysis of Ti-6Al-4 V titanium alloy structure under low-speed impact: improved GISSMO damage model and real ship collision simulation

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Xiaoyu Wang,
  • Shuangxi Xu,
  • Jian Yu,
  • Gaopeng Chen,
  • Wei Dong,
  • Wei Shen

摘要

With the development of lightweight, titanium alloys are widely used in ships and marine engineering, and the crashworthiness of ship structures has a great impact on ship safety. Taking the side structure of Ti-6Al-4 V titanium alloy as the research object, the improved GISSMO damage model is introduced into the low-speed impact assessment of titanium alloy ships for the first time to overcome the limitations of the traditional model Johnson-Cook in capturing the unique “shear-necking” coupling failure mode of Ti-6Al-4 V. Through the ductile fracture tensile test and numerical simulation calibration under complex stress state and deformation mode, the stress triaxial dependent failure curve of Ti-6Al-4 V is constructed and combined with the mixed hardening constitutive model. The horizontal low-speed impact test platform and LS-DYNA simulation software are used to verify the accuracy of damage assessment and evaluate the damage mode of Ti-6Al-4 V under low-speed impact with different failure criteria, and the fitting accuracy of Johnson-Cook criterion is compared and analyzed. On this basis, the collision finite element simulation of the titanium alloy ship’s side structure is carried out, and the influence of different impact positions and different impact angles on the ship’s side structure is analyzed. Finally, the damage law of the ship’s collision is obtained, and the damage characteristics of the side structure under collision are revealed, which provides reference for the evaluation and optimization of the impact resistance of titanium alloy ship’s structure.