We investigated the uniaxial compressive behavior of damaged and intact alumina using quantitative X-ray computed tomography (XCT) analysis coupled with digital image correlation (DIC) for mechanical characterization. Internal three-dimensional crack characteristics such as crack surface area and orientation were quantified using XCT to assess the level of damage. From the quasi-static and dynamic stress–strain results, the primary effects of crack damage are to reduce the initial stiffness and rate of lateral expansion in damaged alumina. With increasing axial strain, crack closure was found to lead to a recovery of elastic properties, in some cases to intact levels, in the damaged specimens. Localized deformation mechanisms related to the crack structure, including lateral crack closure, axial crack opening and closing, and inclined crack sliding, were visualized in-situ and connected to XCT reconstructions. High-speed imaging also revealed a mixed fracture mode for damaged alumina that included axial splitting and failure along pre-existing cracks.

我们使用定量X射线计算机断层扫描（XCT）分析与数字图像相关性（DIC）进行机械表征，研究了受损和完整的氧化铝的单轴压缩行为。使用XCT对内部三维裂纹特征（如裂纹表面积和取向）进行了量化，以评估损伤程度。从准静态和动态应力应变结果来看，裂纹破坏的主要作用是降低受损氧化铝的初始刚度和横向膨胀率。随着轴向应变的增加，发现裂纹闭合导致受损样品的弹性恢复，在某些情况下恢复到完整水平。与裂纹结构有关的局部变形机制，包括横向裂纹闭合，轴向裂纹打开和闭合，和倾斜的裂缝滑动，在现场可视化并连接到XCT重建。高速成像还揭示了受损氧化铝的混合断裂模式，包括轴向分裂和沿既有裂纹的破坏。