【摘要】 以单轴压缩条件下混凝土细观结构CT图像为研究对象,运用分形几何中的差分盒维数法计算出不同扫描断面不同应力阶段的CT图像分形维数,分析了加载过程中分形维数的变化特征,提出了相应的损伤变量,并建立了混凝土材料的损伤演化方程,描述了损伤变量与应变的关系。结果表明该方程可以体现出混凝土试件经历压密、扩容、微裂纹扩展、破坏四个阶段。更多还原

【Abstract】 Based on the CT data about concrete under the uniaxial compression condition,fractal dimensions of CT image of different scanning sections at diversity stress stages are calculated by using DBC of fractal theory.The varying behaviors between the fractal dimension of concrete and the loading process are analyzed.Simultaneously,the corresponding damage variable are presented,and damage evolution equation of concrete material is established,and the relationship between the damage variable and strain is described in this paper.The result shows that the equation may reflect the four phases of concrete specimen loaded,including compaction,expansion,micro-crack growth and damage.更多还原