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射线照相的重要特点之一是它能真实地记录工件内部缺陷的形状和长与宽的尺寸,但不可否认它并非尽善尽美,最大的遗憾是它将工件的三维分布投影在一个二维平面上(图1a 和 b),这不仅使工件内缺陷位置上下难分、深浅难测,而且难以确定缺陷在厚度方向上的高度(或深度)。随着评价技术的发展,缺陷的长、宽、高尺寸对断裂分析有着极其重要的影响。
One of the most important characteristics of radiography is that it can truly record the shape, length and width of internal defects in the workpiece. However, it is undeniable that it is not perfect. The biggest regret is that it projects the three-dimensional distribution of the workpiece on a two-dimensional plane Figure 1a and b), which not only makes the position of the defect within the workpiece difficult to distinguish, difficult to measure the depth, and difficult to determine the defect height (or depth) in the thickness direction. With the development of evaluation techniques, the length, width and height of defects have an extremely important influence on fracture analysis.