It exhibits the viscous effect under dynamic loading case, and the effect strengthens with the growth of the micro-crack density induced by the meso-damage of material.
饱和混凝土中孔隙自由水的存在对材料的力学性能有显著的影响，动态工况中主要表现为自由水的粘性效应，且该效应随细观损伤引起的微裂纹密度的改变而变化。
The specimen was scanned and reconstructed by means of Micro-CT, images of density field were obtained, and the 3D crack morphology was extracted.
采用微焦点CT对疲劳试样进行了扫描与重建，获得了密度场图像库，并提取了试样内部的三维裂纹形态。结果表明裂纹以体的形式存在。
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