基于三维表征方法量化二维技术得到的高纯铝动态损伤分布误差

摘要

Traditional two-dimensional (2D)metallographic modeling method is commonly used to evaluate the spatial void distribution in shocked metals.However,its error was not quantified.This paper reports the comparison of 2D method and three-dimensional (3D)high resolution X-ray tomo-graphy method on evaluating the spatial void distribution in the shocked ultrapure aluminum with different damage degrees.A regression equation (errors vs.impact velocity)was deduced to quantify the errors and a potential correction can be made based on the equation.Therefore,caution should be exercised when using the results reported by 2D methods in the literature.%采用传统的二维（2D）金相分析方法估算受冲击作用后金属样品中孔洞的空间损伤分布时，通常未对误差进行量化。应用传统的二维金相分析方法和三维（3D）高分辨率 X 射线断层扫描方法，分别计算了不同受损程度的高纯铝样品中孔洞的空间损伤分布，比较和分析了两种方法的优、缺点，给出了二者之间的相对误差与飞片撞击速度之间的关系。研究结果可为材料损伤的空间分布统计提供有益的参考。