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<p>High-speed penetration experiments were performed on traditional sintered 93W alloy (93W–5.4Ni–1.6Fe) and a novel 93W–La alloy (93W–5.5Ni–1.1Fe–0.4La) containing 0.4% La, to impact a 30CrMnMo target at a velocity of 1650&#xa0;m/s. The results indicated that the incorporation of La enhanced the mechanical properties of the 93W alloy, resulting in an 8.41% increase in the penetration depth of the 93W–La alloy compared with the sintered 93W alloy. The parameters for the Johnson–Cook constitutive equations of the two types of penetrator materials were determined through quasi-static tensile tests and Split-Hopkinson Pressure Bar (SHPB) experiments. Numerical simulations of the high-speed penetration tests were conducted on the LS-DYNA platform using FEM and adaptive FEM–SPH methods. The simulation results were compared with experimental target impact test data, demonstrating that the adaptive FEM–SPH method had superior computational accuracy. The penetration characteristics of both penetrators were analyzed throughout the crater formation, stable penetration, and plugging stages. The 93W alloy penetrator retained a “mushroom head” shape at the tip throughout the penetration process, whereas the 93W–La alloy penetrator exhibited significant adiabatic shear sensitivity, leading to adiabatic shear failure and “self-sharpening” characteristics.</p>

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Experimental study and numerical simulation on the penetration mechanisms of La-modified 93W alloy based on adaptive FEM–SPH method

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Jun Fang,
  • Dongsheng Han,
  • Yawen Liao,
  • Mingchuan Wang,
  • Chengxin Du,
  • Zhonghua Du,
  • Cai Chen

摘要

High-speed penetration experiments were performed on traditional sintered 93W alloy (93W–5.4Ni–1.6Fe) and a novel 93W–La alloy (93W–5.5Ni–1.1Fe–0.4La) containing 0.4% La, to impact a 30CrMnMo target at a velocity of 1650 m/s. The results indicated that the incorporation of La enhanced the mechanical properties of the 93W alloy, resulting in an 8.41% increase in the penetration depth of the 93W–La alloy compared with the sintered 93W alloy. The parameters for the Johnson–Cook constitutive equations of the two types of penetrator materials were determined through quasi-static tensile tests and Split-Hopkinson Pressure Bar (SHPB) experiments. Numerical simulations of the high-speed penetration tests were conducted on the LS-DYNA platform using FEM and adaptive FEM–SPH methods. The simulation results were compared with experimental target impact test data, demonstrating that the adaptive FEM–SPH method had superior computational accuracy. The penetration characteristics of both penetrators were analyzed throughout the crater formation, stable penetration, and plugging stages. The 93W alloy penetrator retained a “mushroom head” shape at the tip throughout the penetration process, whereas the 93W–La alloy penetrator exhibited significant adiabatic shear sensitivity, leading to adiabatic shear failure and “self-sharpening” characteristics.