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首页> 外文期刊>International Journal of Solids and Structures >Revisiting the perforation of ductile plates by sharp-nosed rigid projectiles
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Revisiting the perforation of ductile plates by sharp-nosed rigid projectiles

机译：重新探究尖锐的刚性弹丸对延性板的穿孔

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The process of ductile plate perforation by sharp-nosed rigid projectiles is further examined in this work through 2D numerical simulations. We highlight various features concerning the effective resisting stress (σ_r) which a finite thickness plate, with a flow stress of Y_t, exerts on the projectile during perforation. In particular, we show that the normalized resisting stress (σ_r/Y_t) can be represented as a unique function of the normalized thickness of the plate (H/D, where H is plate thickness and D is projectile diameter), for a large range of normalized thicknesses. Our simulations for very thin target plates show that the penetration process is achieved through the well-known dishing mechanism, where the target material is pushed forward by the projectile's nose. An important observation, which emerges from our simulations, is that the transition between the dishing and the hole enlargement mechanisms takes place at a normalized thickness of about H/D = 1/3. We also find that the normalized resistive stress for intermediate plate thicknesses, 1/3 < H/D < 1.0, is relatively constant at a value of σ_r/Y_t = 2.0. This range of thicknesses conforms to a state of quasi plane stress in the plates. For thicker plates (H/D > 1) the σ_r/Y_t ratio increases monotonically to values which represent the resistance to penetration of semi-infinite targets, where the stress state is characterized by plane strain conditions. Using a simple model, which is based on energy conservation, we can predict the values of the ballistic limit velocities for many projectile/target combinations, provided the perforation is done through the ductile hole enlargement mechanism. Good agreement is demonstrated between predictions from our model and experimental data from different sources, strongly enhancing the confidence in both the validity and usefulness of our model.
机译：通过二维数值模拟，在这项工作中进一步检查了尖锐的刚性弹丸对延性板的穿孔过程。我们重点介绍了与有效抵抗应力（σ_r）有关的各种特征，该有限抵抗力板在射孔过程中以Y_t的流动应力作用在射弹上，而厚度有限。特别是，我们表明，在较大范围内，归一化的抵抗应力（σ_r/ Y_t）可以表示为板的归一化厚度的唯一函数（H / D，其中H为板厚度，D为弹丸直径）归一化厚度。我们对非常薄的靶板的仿真表明，穿透过程是通过众所周知的凹陷机制实现的，在该机制中，靶材料被弹丸的鼻子向前推动。从我们的模拟中得出的一个重要观察结果是，凹陷和扩孔机制之间的过渡发生在约H / D = 1/3的归一化厚度下。我们还发现，中间板厚度的标准化电阻应力1/3 1），σ_r/ Y_t比单调增加到代表半无限目标穿透的阻力的值，其中应力状态由平面应变条件表征。使用一个基于能量守恒的简单模型，我们可以预测许多弹丸/目标组合的弹道极限速度值，前提是要通过延性孔扩大机制完成射孔。我们的模型预测与不同来源的实验数据之间显示出良好的一致性，从而大大增强了我们对模型有效性和实用性的信心。

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