School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
College of Field Engineering, Army Engineering University of PLA, Nanjing, 210007, People's Republic of China.
Sci Rep. 2023 Mar 13;13(1):4149. doi: 10.1038/s41598-023-30836-0.
The shaped charge jet formation of a Zr-based amorphous alloy and the applicability of different numerical algorithms to describe the jet formed were experimentally and numerically investigated. X-ray experiments were performed to study jet characteristics. The numerical results for the Zr-based amorphous alloy jet formed via the Euler and smooth particle hydrodynamics (SPH) algorithms were compared and analyzed using the Autodyn hydrocode. Particle motion was examined based on material properties. The Zr-based amorphous alloy formed a noncohesive jet driven by an 8701 explosive. Both the Euler and SPH algorithms achieved high accuracy for the determination of jet velocity. When the improved Johnson-Holmquist constitutive model (JH-2) was used, numerical results confirmed the model's suitability for the Zr-based amorphous alloy. The Euler algorithm effectively reflected jet shape within a short computing time, whereas the SPH algorithm was highly suitable for showing the shape of the jet tail within a long computing time. In the 3D Euler model, the flared jet mouth indicated radial particle dispersion; however, in the 2D model, particle dispersion in the head was directly observed by using the JH-2 material model. The brittle fracture of the material reduced the proportion of particles near the liner apex forming a jet. Furthermore, a new method in which stagnation pressure was used to predict jet formation and its coherence was proposed since the collapse angle was difficult to obtain.
采用实验和数值模拟的方法研究了 Zr 基非晶合金的聚能射流形成过程以及不同数值算法在描述射流形成过程中的适用性。采用 X 射线实验研究射流特性。利用 Autodyn 软件，对比并分析了 Zr 基非晶合金射流通过 Euler 和光滑粒子流体动力学（SPH）算法形成的数值结果。基于材料特性研究了颗粒运动。在 8701 炸药的驱动下，Zr 基非晶合金形成了无粘性射流。Euler 和 SPH 算法都能精确地确定射流速度。当使用改进的 Johnson-Holmquist 本构模型（JH-2）时，数值结果证实了该模型对 Zr 基非晶合金的适用性。Euler 算法在短计算时间内有效地反映了射流形状，而 SPH 算法在长计算时间内非常适合显示射流尾部的形状。在 3D Euler 模型中，喇叭形射流口表明了径向颗粒弥散；然而，在 2D 模型中，通过使用 JH-2 材料模型可以直接观察到头部的颗粒弥散。材料的脆性断裂减少了靠近衬垫顶点形成射流的颗粒比例。此外，由于难以获得坍塌角，提出了一种利用驻点压力预测射流形成及其连贯性的新方法。
