Scholarlink

<p>The advanced composite armor systems are essential to meet the increased need of lightweight high performance ballistic defence in the current defence and aerospace systems. Due to the fact that the conventional monolithic armors are usually characterized by a high aerial density, a strategic change towards the hybrid multilayered armors occurs. Kevlar 29, Ultra-High Molecular Weight Polyethylene (UHMWPE), and high-strength aluminum alloys present very complementary mechanical properties, with high surface hardness and outstanding tensile strength, ductility, and specific energy absorption. This paper will report a three-dimensional, rigorous, numerical study of the response of a ballistic impact, stress wave propagation, and energy dissipation of a 20&#xa0;mm hybrid multilayer armor panel. A finite element model with high fidelity was built using ANSYS Explicit Dynamics solver to model the high-velocity (715&#xa0;m/s) impact of a Steel 4340 ogive projectile. The optimized target setup is a 4&#xa0;mm Aluminum Alloy (AA) 7075-T6 strike face that forms the projectile mushrooming and plastic deformation to absorb the energy, supported by an 8&#xa0;mm Kevlar 29 layer and an 8&#xa0;mm UHMWPE layer to entrap the projectile and absorb the remaining kinetic energy. The Johnson-Cook and Steinberg-Guinan constitutive models, with a Mie-Gruneisen Equation of State (EOS) and geometric strain-limit erosion criteria, were used to accurately predict complex thermomechanical behaviors, such as high strain-rate sensitivities and adiabatic softening. The numerical simulations showed that the proposed configuration of the hybrid multilayer armour will not fully perforate the armour under the conditions of the simulation, bringing the projectile velocity from 715&#xa0;m/s to 5.82&#xa0;m/s. The simulation results show that a 16,300&#xa0;J of kinetic energy is absorbed by 12,500&#xa0;J of internal energy of the multilayer armor system and dissipated in the armor system. Moreover, an equivalent von-Mises stress analysis showed the highest concentration of localized stress at 8.54 GPa in the UHMWPE layers, which was highly compliant, as opposed to the strike face that was metallic. The experiment showed that trapping and dissipating destructive shock waves with the help of materials possessing varying acoustic characteristics proved to be very effective prior to reaching the rear plate. These numerical results give some idea of the potential energy absorption mechanisms and the stress wave-attenuation in the proposed hybrid armor configuration.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Numerical investigation of ballistic impact response and energy absorption in hybrid Kevlar–UHMWPE–aluminum multilayer armor systems

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • Sai Chand Kundurti,
  • Ambuj Sharma,
  • M. V. Varalakshmi,
  • V. Venkata Phani Babu,
  • Bridjesh Pappula

摘要

The advanced composite armor systems are essential to meet the increased need of lightweight high performance ballistic defence in the current defence and aerospace systems. Due to the fact that the conventional monolithic armors are usually characterized by a high aerial density, a strategic change towards the hybrid multilayered armors occurs. Kevlar 29, Ultra-High Molecular Weight Polyethylene (UHMWPE), and high-strength aluminum alloys present very complementary mechanical properties, with high surface hardness and outstanding tensile strength, ductility, and specific energy absorption. This paper will report a three-dimensional, rigorous, numerical study of the response of a ballistic impact, stress wave propagation, and energy dissipation of a 20 mm hybrid multilayer armor panel. A finite element model with high fidelity was built using ANSYS Explicit Dynamics solver to model the high-velocity (715 m/s) impact of a Steel 4340 ogive projectile. The optimized target setup is a 4 mm Aluminum Alloy (AA) 7075-T6 strike face that forms the projectile mushrooming and plastic deformation to absorb the energy, supported by an 8 mm Kevlar 29 layer and an 8 mm UHMWPE layer to entrap the projectile and absorb the remaining kinetic energy. The Johnson-Cook and Steinberg-Guinan constitutive models, with a Mie-Gruneisen Equation of State (EOS) and geometric strain-limit erosion criteria, were used to accurately predict complex thermomechanical behaviors, such as high strain-rate sensitivities and adiabatic softening. The numerical simulations showed that the proposed configuration of the hybrid multilayer armour will not fully perforate the armour under the conditions of the simulation, bringing the projectile velocity from 715 m/s to 5.82 m/s. The simulation results show that a 16,300 J of kinetic energy is absorbed by 12,500 J of internal energy of the multilayer armor system and dissipated in the armor system. Moreover, an equivalent von-Mises stress analysis showed the highest concentration of localized stress at 8.54 GPa in the UHMWPE layers, which was highly compliant, as opposed to the strike face that was metallic. The experiment showed that trapping and dissipating destructive shock waves with the help of materials possessing varying acoustic characteristics proved to be very effective prior to reaching the rear plate. These numerical results give some idea of the potential energy absorption mechanisms and the stress wave-attenuation in the proposed hybrid armor configuration.