弹体高速侵彻的侵蚀机理及数值模拟方法研究

The study of high-speed projectiles penetrating concrete targets have a great significance for new warhead design and protection structure design. This project will focus on the erosion mechanism of high-speed penetration. The numerical simulation is used to be the main research method, and the experimental and theoretical studies are combined to carry out the research work of high-speed projectile penetrating concrete targets. (1) The experimental study of the large size high-speed projectile penetrating concrete targets will be carried out, and the penetration data of different material and nose shape projectile will be obtained from the experiment, which can provide the physical parameters for the numerical simulation and theoretical analysis; (2) Aiming at the mass loss of projectile for high-speed penetration and based on micromechanical analysis, the micromechanical model including damage evolution and phase transition will be established, which can discribe mass erosion of the projectile; (3) The physical and mechanical model will be established with the material damage, the thermal softening and phase transition, which can give a reasonable description of the projectile deformation and erosion for the numerical algorithms, and the corresponding hydrocode will be developed; (4) Analyzing the relationship between initial velocity and penetration depth, the quantitative description method for mass erosion of the projectile will be proposed, the calculation method for penatration depth including mass erosion influence will be established. The results of this project have important role for the design of high-speed earth penetrator.

弹体高速侵彻混凝土问题的研究对于新型战斗部研制和防护结构设计具有重要意义。本项目将针对高速侵彻的侵蚀机理，以数值模拟为主要研究手段，结合实验研究和理论分析，开展弹体高速侵彻混凝土靶的研究工作：（1）开展大尺寸弹体高速侵彻混凝土靶的实验研究，获得不同弹材、头部形状的弹体侵彻规律数据，为数值模拟和理论分析提供物理参数；（2）针对高速侵彻过程中产生的弹体质量损失现象，基于细观分析，建立描述弹体质量侵蚀的含有损伤演化及相变的细观力学模型；（3）建立含材料损伤、热软化效应及相变的描述侵蚀机制的物理力学模型，给出能够合理描述弹体变形及质量侵蚀的数值模拟算法，开发相应的数值计算程序；（4）分析侵彻深度与撞靶初速的关系，给出弹体质量侵蚀的定量描述方法，建立含质量侵蚀影响的弹体侵彻深度计算方法。本项目的研究成果对于高速侵彻钻地弹的设计具有重要意义。

在国家自然科学基金项目的资助下，按照项目计划书中提出的研究内容，围绕弹体高速侵彻过程中的质量侵蚀机理开展了深入系统的研究，取得了如下创新性研究成果：（1）进行了100mm大口径弹体高速侵彻混凝土靶的实验研究，获得了侵彻过程中弹体的质量侵蚀以及靶板破坏结果数据；（2）针对高速侵彻混凝土靶后回收的弹体进行了金相分析，从微观角度分析了弹体的侵蚀机理；（3）结合金相分析结果，提出了改进的弹体质量侵蚀分析模型；（4）提出了基于欧拉方法的质点映射算法，给出了弹体高速侵彻质量侵蚀的数值模型；（5）此外，在国家自然科学基金项目的资助下，还开展了13.5 mm口径螺旋弹丸侵彻混凝土靶的实验及数值模拟研究。项目圆满完成了预定研究内容，达到了预期研究目标。在该项目的资助下，共发表SCI收录论文5篇，EI收录论文5篇，核心期刊论文2篇，出版学术专著1部，培养博士研究生1名，硕士研究生5名。