冲击波阵面几何扰动衰减特性及材料强度效应研究

Study on the Evolutionary Character of the Geometrical Disturbance on the Shock Front and the Strength of the Relevant Material

非理想球面冲击波的几何整形问题是强冲击动力学研究的关键问题之一,因此研究冲击波阵面几何扰动的衰减特性与金属材料的动力学性质之间的关系成为冲击波物理研究领域的一个重要课题.利用二维有限差分方法数值再现飞片碰撞扰动实验,得到金属铝中冲击波振面扰动随传播距离演化的全过程.利用数值模拟发现金属铝的屈服强度对扰动衰减曲线上的2个特征点非常敏感,即零相位点和最大反向点,给出他们之间的定量关联.数值分析结果为飞片碰撞扰动方法研究材料的强度效应提供合理的理论支持,并提供一个研究材料强度效应的新思路.

How to develop the non ideal spherical shock wave is one of the key problems. So the study of the relationship between the evolutionary character of the geometrical disturbance on the shock front and the dynamic properties of the relevant metal is an important subject in shock wave physics. In this paper,the two-dimensional finite difference method is used to simulate the flyer-impact disturbance experiment and the evolution of the disturbance on the shock front with the propagation distance in Aluminum is obtained. It is found that the yield strength is sensitive to the two characteristic points（ the zero-amplitude point and the point with maximum amplitude of reverse-phase） on the disturbance amplitude damping curves,and the quantitative relation between them is listed. Therefore,this paper provides a theoretical basis for studying the strength effect of materials by the flyer-impact disturbance experiment,and opens a new way to study the strength properties of materials.