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<p>In this work, a 16&#xa0;mm light-gas gun system was employed to conduct multiple impact tests on one-sided constrained Ti-6Al-4V titanium alloy thin plates. Through mechanical analysis and microstructural characterization, the mechanical response behavior under projectile impact was systematically investigated. A predictive model for the bending angle of thin plates was developed, and key coefficients—including the energy absorption ratio, overshoot coefficient, and damping ratio—were calibrated experimentally, significantly improving the model’s prediction accuracy. The results show that, with increasing impact energy, the thin plates sequentially exhibited indentation, cracking, and localized perforation response features. Due to the limitation of energy absorption capacity, the dominant energy dissipation mechanism gradually shifted from bending and localized plastic deformation to the residual kinetic energy of the projectile. Fracture of the Ti-6Al-4V plates proceeded through three stages: energy dissipation, tearing, and plastic fracture. When the impact velocity placed the plate in the damage stage characterized by stable crack propagation, adiabatic shear behavior was observed along the crack path. This study provides a theoretical basis and engineering guidance for the impact-resistant design of Ti-6Al-4V thin plates under one-sided constraint conditions.</p>

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Projectile Impact Response and Fracture of Unilaterally Constrained Ti-6Al-4V Plates

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Yizhong Li,
  • Bingbing Yu,
  • Shuxin Deng,
  • Yujing Liu,
  • Zibo Zhao,
  • Xianzhao Song,
  • Jin Lin,
  • Zhu Song

摘要

In this work, a 16 mm light-gas gun system was employed to conduct multiple impact tests on one-sided constrained Ti-6Al-4V titanium alloy thin plates. Through mechanical analysis and microstructural characterization, the mechanical response behavior under projectile impact was systematically investigated. A predictive model for the bending angle of thin plates was developed, and key coefficients—including the energy absorption ratio, overshoot coefficient, and damping ratio—were calibrated experimentally, significantly improving the model’s prediction accuracy. The results show that, with increasing impact energy, the thin plates sequentially exhibited indentation, cracking, and localized perforation response features. Due to the limitation of energy absorption capacity, the dominant energy dissipation mechanism gradually shifted from bending and localized plastic deformation to the residual kinetic energy of the projectile. Fracture of the Ti-6Al-4V plates proceeded through three stages: energy dissipation, tearing, and plastic fracture. When the impact velocity placed the plate in the damage stage characterized by stable crack propagation, adiabatic shear behavior was observed along the crack path. This study provides a theoretical basis and engineering guidance for the impact-resistant design of Ti-6Al-4V thin plates under one-sided constraint conditions.