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Finite elements simulation of improvised explosively formed projectiles

机译：简易爆炸物弹丸的有限元模拟

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Purpose - The purpose of this paper is to investigate the applicability of the LS-DYNA software using a Lagrangian formulation in the jet formation, flight and penetration of improvised explosively formed projectiles (EFPs). Numerical results dealing with different properties of the EFPs have been validated with a significant number of field tests.Design/methodology/approach - 2D and 3D Lagrangian models, using different material definition, are developed to reproduce the field-measured characteristics of copper- and steel-made EFPs: projectile size and velocity. After validation, the model has been extended to analyse the penetration features. Two different plasticity models have been used to describe the steel target, Plastic-Kinematic and Johnson-Cook.Findings - Despite the difficulty in characterizing a non-industrial artefact, the results show that both Lagrangian models (2D and 3D) are able to simulate the projectile size, velocity and penetration capability with errors less than 10 per cent when using the Johnson-Cook material model for both liner and target.Practical implications - These data can be used to test the penetration ability of improvised EFP's against different targets, i.e. light armoured vehicles.Originality/value - There are no references that address the application of the Lagrangian simulation of non-industrial EFPs and its validation with field tests, including penetration assessment.
机译：目的-本文的目的是研究使用拉格朗日公式的LS-DYNA软件在简易爆炸物（EFP）的射流形成，飞行和穿透中的适用性。已通过大量现场测试验证了处理EFP不同特性的数值结果。设计/方法/方法-使用不同的材料定义开发了2D和3D拉格朗日模型，以再现铜和铜的现场测量特性。钢制EFP：弹丸的大小和速度。验证后，该模型已扩展为可分析渗透特征。研究结果-尽管很难描述非工业制品，但使用了两种不同的可塑性模型来描述钢靶。结果-尽管很难描述非工业制品，但结果表明这两种拉格朗日模型（2D和3D）都可以模拟当使用Johnson-Cook材料模型对衬管和目标物进行测量时，弹丸的尺寸，速度和穿透能力的误差小于10％。实际意义-这些数据可用于测试简易EFP对不同目标物的穿透能力，即原始数据/价值-没有参考文献可用于非工业EFP拉格朗日模拟的应用及其通过包括渗透评估在内的现场测试的验证。

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