摘要
射流成型情况关系到对目标的侵彻毁伤效果。非晶合金材料有着不同于金属材料的独特力学特性,其用于聚能装药中形成的射流形态十分特殊,可以在保证一定侵彻深度的同时提高开孔孔径。将数值模拟和试验验证相结合,对Zr基非晶合金药型罩射流成型特性展开研究。将Zr基非晶合金和Cu药型罩形成的射流进行对比分析,发现具有明显差异。这是由于非晶合金材料在高应变率下的微小塑性不予考虑,经过弹性压缩阶段后,由于Zr基非晶合金材料屈服强度极大,几无塑性,药型罩破碎,形成大量质量不均的粒子,仿真上体现为密度分布,并向轴向汇聚形成粒子流,由于粒子质量不等,在碰撞汇聚时,小质量粒子径向速度较大,分布在外围,大质量粒子则靠近轴心,形成大直径的非凝聚高速集束粒子流,并通过X光摄像试验结果进行验证。基于脆性材料模型的本构方程和SPH数值仿真方法能够对射流成型近似模拟,当射流因药型罩加工质量问题致使质量不均匀时,仿真与实际具有一定差距。
The formation of the jet is related to the penetrating damage effect on the target.Amorphous alloy materials have unique mechanical properties which are different from metal materials.And the jet shape formed in the shaped charge is very special,which can increase the aperture diameter while ensuring a certain penetration depth.Through the combination of numerical simulation and experimental verification,the study of the jet forming characteristics of Zr-based amorphous alloy liner was carried out.There are obvious differences through comparing and analyzing the jets formed by Zr-based amorphous alloy and Cu.This is because the tiny plasticity of amorphous alloy materials at high strain rates is not considered.After the elastic compression stage,due to the extremely high yield strength of Zr-based amorphous alloy materials and almost no plasticity,the liner is broken,and a large number of particles with uneven quality are formed.They are shown as density distribution in the simulation,and converge to the axial direction to form a particle flow.Due to the unequal mass of the particles,when the collision converges,the small-mass particles with a larger radial velocity are distributed in the periphery;the large-mass particles are close to the axis,forming large-diameter non-agglomerated high-speed cluster particle flow,and are verified by X-ray imaging test results.The constitutive equation and SPH numerical simulation method based on the brittle material model can approximately simulate the jet forming.When the jet quality is uneven due to the quality of the liner,there is a certain gap between the simulation and the reality.
作者
陈亮
祖旭东
黄正祥
肖强强
韩伟
CHEN Liang;ZU Xudong;HUANG Zhengxiang;XIAO Qiangqiang;HAN Wei(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Unit 32381 of PLA,Beijing 100071,China)
出处
《弹道学报》
CSCD
北大核心
2022年第1期65-71,共7页
Journal of Ballistics
基金
国家自然科学基金(11872214)
江苏省研究生科研与实践创新计划项目(KYCX20_0384)。
