【作者】 王建刚；

【导师】 黄奕勇； 梁深根； 李国兰；

【作者基本信息】 国防科学技术大学 ， 航天工程， 2011， 硕士

【摘要】 随着有限元技术的飞速发展,运用计算机进行数值模拟已经成为一种重要手段,越来越广泛地应用于钢筋混凝土类坚固目标的侵彻问题研究。本文的工作是在参阅大量文献的基础上,运用成熟的有限元软件LS-DYNA程序,围绕钢筋混凝土靶板侵彻问题的数值模拟展开的。具体工作如下:1、对钢筋混凝土侵彻问题进行了综述,分析讨论了混凝土侵彻问题研究的方法、国内外研究历史与现状,为后续工作奠定了基础。2、对钢筋混凝土靶标的动态损伤破坏模式与数值分析中常用的混凝土动态本构模型进行了调研,分析了主要几种本构模型的适用范围与不足,确定了选择HJC作为本文开展数值计算的混凝土本构模型,并结合本文的研究确定了相应的混凝土动态模型参数。3、建立详细的弹靶有限元模型,并分析比较了不同钢筋混凝土有限元模型对计算结果的影响,确定了适合本课题研究的钢筋混凝土有限元模型及算法。4、针对攻角、倾角、着速、弹着点等弹道参数的变化对钢筋混凝土目标侵彻性能的影响开展了数值计算分析,总结了相关规律,并分析了子弹前后舱段对子弹侵彻性能的影响,对子弹设计具有重要指导意义。5、结合试验研究进行了针对部分数值模拟工况的的验证性试验,得出了相关结论。最后,对全文的研究进行了总结,并讨论了今后需要进一步深入研究的工作。更多还原

【Abstract】 With the rapid development of finite element technology, using computer simulation has become an important tool, which has been applicated to research penetration of RC targets more and more widely. The main work of this paper is started around the problem of RC targets penetration simulation, based on extensive references and application of sophisticated finite element software LS-DYNA program.The main works are as follows:1. Summarizing the problem of RC penetration, analyzing and discussing method, research history at domestic and abroad and current research situation of RC penetration, the works above laid the foundation for the follow-up.2. Researching dynamic damage and failure modes of RC targets and common dynamic constitutive models of concrete in numerical analysis, analyzing scope and shortcomings of several main dynamic constitutive models, choosing HJC as the numerical dynamic constitutive model, and identifying the corresponding dynamic constitutive mode parameters for the study of this paper.3. Establishing the detail finite element model of projectile and target, comparing and analyzing the impact by the different finite element models of RC on the numerical results, and identifying the finite element model of RC and algorithm for this project.4. Starting the numerical analysis around the impact on the penetration behavior of RC when the ballistic parameters which includes angle of attack, angle of trajectory inclination, speed, and attack point was changed, summarizing the relevant laws, and analyzing the impact by front and rear cabin on penetration behavior of missile, these are of great reference value for the missile design.5. The verification tests were carried out for some numerical simulation conditions, and some relevant conclusions was drawn.Finally, summarizing the full text studies, and discussing the works which need to be further researched in the future.更多还原