【作者】 齐振伟；

【导师】 王振国；

【作者基本信息】 国防科学技术大学 ， 航空宇航科学与技术， 2007， 博士

【摘要】 各种钻地武器已成为现代战争中发挥着不可替代作用的新型武器。串联随进弹由于其特有的优点已成为世界各国侵彻战斗部发展的一个重要方向,成为对付机场跑道和地下深埋战术和战略目标的有效手段。开展反机场跑道串联随进弹终点效应的数值模拟和实验研究,对武器战斗部的设计具有重要意义。围绕反机场跑道串联随进弹终点效应问题,本文在开发典型的金属材料和混凝土材料的动态本构模型及数值模拟两方面做了一些研究工作,取得了以下研究成果:(1)自行开发了适合描述爆轰波与金属壳体相互作用这一多尺度物理问题数值模拟的本构关系—状态方程,建立相关材料的宏、细观甚至微观模型,开发了用户材料模型子程序,并将其植入LS-DYNA动力有限元程序。对模型的可行性进行了计算考核,并将其用于串联随进战斗部中金属构件的动态响应数值模拟中。(2)自行开发了适合描述混凝土大变形、高应变率、高压加载响应的混凝土计算本构模型——动态随机损伤本构模型,并将其引入三维动力有限元程序LS-DYNA。模型在考虑混凝土的损伤(包括拉、压损伤)、应变率效应及破坏模式的完备性方面有所改进,并给出了确定材料模型本构参数的实用方法。新模型被用于模拟串联随进战斗部侵彻加载下的混凝土动态响应行为。(3)对聚能装药战斗部侵彻多层混凝土介质的实验方法和实验测量进行了分析,进行了一系列聚能装药战斗部侵彻混凝土靶体的实验研究,获取了一些实验结果,可作为数值模拟计算的对比验证。(4)根据战斗部的技术指标要求,对聚能装药战斗部射流形成过程及侵彻多层混凝土介质这一问题进行了建模和数值模拟计算,对影响串联随进战斗部性能指标的各因子进行了计算分析。(5)选取了合适的计算模型以及计算方法,针对串联战斗部前级开坑、后级随进及破坏多层混凝土靶体进行了连贯的数值模拟研究,给出了随进弹跟进聚能射流的数值模拟结果,得到了不同工况下随进弹侵彻混凝土靶体的破坏毁伤情况。(6)针对材料在不同动态加载条件下的响应特性,在数值模拟计算时合理地选择了材料模型。针对不同的物理问题,灵活而合理地选择了恰当的计算方法,最大限度地描述和再现了动态响应过程。本文的研究成果可以为串联随进战斗部侵彻机场跑道毁伤效应的工程分析、数值模拟、战斗部设计和实验技术提供重要的理论参考,从而达到节省人力、物力并提高效率的目的。更多还原

【Abstract】 Many kinds of penetration weapon have been new pattern weapon which played important role that can’t be taken placed of in modern war. Because of its special features, the tandem following warhead has been an important development direction in penetration warhead all over the world, and has been an effective means of anti-runway and other underground tactical and strategical target. Experiment research and numerical simulation on terminal effect of anti-runway tandem following warhead will benefit to warhead design.Focusing on the terminal effect of anti-runway tandem following warhead, this paper presents some progress in developing new dynamic constitutive model of metal and concrete and in simulating on the above dynamic problem. The main research results obtained can be summarized as:(1) A new metal constitutive model coupled with EOS, was independently developed. It is suitable for describing the interaction of metal and detonation wave, which is a multi-scale physical problem in numerical simulation. The newly developed model established a relation between the macrocosmic and sub-macrocosmic even microcosmic phenomena. The UMAT subroutine of the model was coded into LS-DYNA, a 3D dynamic FE code. The newly developed model has been evaluated in simulating the dynamic response of metal components in tandem following warhead.(2) A new concrete constitutive model, dynamic stochastic continuum damage model, was independently developed. It is suitable for describing concrete under large deformation, high strain rate, high pressure loading. The model was coded into LS-DYNA, a 3D DYNAmic FE code. The new model has advantage for categoricalness in consideration the damage, including tension and compression, strain-rate-dependence, and failure mode. Also given is the practical method of determing of the material constant of RDCDMC. The new developed model has been evaluated in simulating the dynamic response of concrete penetrated by tandem following warhead.(3) We have analyzed the experiment method and measurement of jet forming penetrating the multi-layer concrete target, and carried out a series of experiment research. The results of experiments can be used to verify the results of our numerical simulation.(4) According to the technology target of the warhead, we have established a model and simulated the process of jet formation and penetration into the multi-layer concrete target, and analyzed the factors that affect the performance of the tandem following warhead.(5) Appropriate calculation model and method were applied in continuous numerical simulation of the first jet cabin and the following bullet of tandem following warhead penetrating into multi-layer concrete target. The result of numerical simulation under several conditions showed that the damage profile of the concrete target penetrated by the following bullet and the metal jet.(6) Appropriate material model was applied in numerical simulation to describe the different response of material under different dynamic loading. Also selected is the appropriate formulation or method according to different physical problem, with the dynamic phenomena rendered detailedly and furthest.These research results can provide some important theoretical reference in the engineer analysis, numerical simulation, warhead design and experiment technology of anti-runway tandem following warhead penetration and destroy effect, and can save much manpower, material resources, and improve efficiency.更多还原