X射线CT研究混凝土的目的是通过CT扫描获得的CT图像，分析混凝土在不同荷载作用下细观裂纹的演化过程，解释混凝土宏观强度和变形特性。
The purpose of studying concrete using X-ray CT is to analyze concrete meso-crack evolution process and explain concrete macroscopic strength and strain character based on concrete CT images.
本文从细观力学角度研究了高脆性材料亚临界裂纹扩展机制。
The subcritical crack growth mechanism in brittle materials is studied from the viewpoint of mesomechanics.
文中以裂纹连续扩展的断裂力学方法，研究单向纤维复合材料的细观损伤演化与韧度计算。
The methodology of fracture mechanics based on continuous crack growth was applied to the investigation of the microscopic damage evolution and toughness calculation for fiber composites.
在CT尺度裂纹演化和破坏阶段，由于岩石损伤高度局部化，声发射率参数不能精确反映岩石破坏的细观机制。
At the process of ct crack and rapture evolution, the acoustic emission can not precisely reflect the meso-mechanism of rock deformation and rapture because of localization of damage.
细观解理断裂应力主要由临界裂纹的长度决定。
The local cleavage fracture stress is mainly determined by the length of the critical microcrack.
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。
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.
针对以缺陷密度为参量的细观损伤演化模型的局限性，着重研究了微裂纹尺寸对损伤演化的影响。
The effect of the microcracks size on damage evolution was investigated to overcome the limitations of damage models based only on defect density.
硬化后混凝土材料具有细观、微观多孔隙特征，即使配制良好的高性能混凝土，也含有微孔隙和微裂纹。
Sclerous concrete materials possess the characteristics of imperceptibility, microcosmic and more micro-pores, even excellent high-performance cement possess so.
基于对裂隙岩石的细观CT试验，对含有单一裂纹的贵溪红砂岩在单轴疲劳荷载作用下的损伤扩展机理和演化过程进行了初步的试验研究。
Based on real time CT testing, primary testing study of fatigue failure and deformation mechanism of red sandstone has been completed under uniaxial compression condition.
对应于荷载水平，对这些断裂过程的细观图片进行了系统的分析，表明裂纹扩展路径具有明显分形性质。
The images of crack path were analyzed systematically using fractal geometry method, and it showed that the growth paths of crack were of fractal property.
提出了含三相正交分布等尺寸微裂纹的准脆性材料稳定扩展的细观损伤演化模型。
The stable growth of cracks in a brittle material with three mutually perpendicular families of microcracks under proportional tensile loads was studied.
一般地，材料内部的微裂纹可采用椭圆形微裂纹进行描述以较真实地反映微裂纹系统的细观特性。
The microcracks in materials can generally be assumed to be elliptic, which can describe more exactly the properties of a microcracks system.
软岩屈服现象的本质是CT尺度裂纹演化，裂纹演化是软岩在峰值强度前的主要细观过程。
The yield point is based on the evolution crack on CT scale and the meso process of soft rock before the streng...
软岩屈服现象的本质是CT尺度裂纹演化，裂纹演化是软岩在峰值强度前的主要细观过程。
The yield point is based on the evolution crack on CT scale and the meso process of soft rock before the strength maximum is the...
把细观损伤理论和宏观统计损伤模型结合，建立应力–应变与微裂纹密度变化的关系；
The relation between stress-strain and density variation of rock crack has been obtained through the meso-damage theory and damage statistics model.
利用扫描电镜（SEM）拍摄得到昌江花岗岩的大量细观结构图片，利用数字图像技术对图片进行处理，提取微裂纹的细观几何信息。
The mesostructural images of marble are processed by regional growing theory based on image processing technique. The meso-damage information of granite microcracks are obtained from SEM images.
通过对混凝土CT图像影像特征的分析可以研究混凝土内部细观结构及裂纹变化的特点，但当前国内对混凝土的CT试验研究很少。
The characters of microstructure and crack change in concrete can be investigated by ct images. But now there is rare quantitative analysis of concrete ct images in China.
细观统计结果表明，裂纹区域和邻近区域的密度要低于正常区域的密度，材料内部的疲劳损伤呈现不均匀性。
Statistical analysis of density field was quantified at mesoscale level, including interior, adjacent region, path of propagation of the crack and towards both sides of crack.
细观统计结果表明，裂纹区域和邻近区域的密度要低于正常区域的密度，材料内部的疲劳损伤呈现不均匀性。
Statistical analysis of density field was quantified at mesoscale level, including interior, adjacent region, path of propagation of the crack and towards both sides of crack.
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