基于CT图像处理技术的混凝土细观破裂分形分析
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摘要
以单轴压缩条件下混凝土细观损伤演化的CT图像为研究对象,借助于数字图像处理技术对CT图像进行了阈值分割,提取出了图像中的裂纹形态,分析了单轴压缩条件下混凝土内部微裂纹的萌生、扩展和贯通的全过程,并利用差分盒维数法估算出图像裂纹扩展的分形维数.在此基础上,获得了载荷、扩展裂纹及分形维数三者之间的关系.结果表明:在单轴压缩条件下,定义的分形维数随着裂纹的扩展逐渐增加,可将细观结构分形维数作为研究混凝土细观裂纹扩展的定量参数.
Based on CT image of concrete meso-damage evolution under unaxial compression.The CT image was analyzed by the method of digital image processing,which included threshold partition,and then the real crack morphologic was got.So the CT image of crack propagation,coalescence and failure the whole process was researched.The fractal dimension of crack propagation of CT image was estimated by Differential Box Counting fractal theory.On the basis of the results,the relationship among the stress load,the crack propagation and the fractal dimension was found.The results showed that the value of fractal dimensions increased with the evolution of crack,so the fracture of the meso-structure was calculated as a quantitative parameter to research the meso-crack propagation.
Based on CT image of concrete meso-damage evolution under unaxial compression.The CT image was analyzed by the method of digital image processing,which included threshold partition,and then the real crack morphologic was got.So the CT image of crack propagation,coalescence and failure the whole process was researched.The fractal dimension of crack propagation of CT image was estimated by Differential Box Counting fractal theory.On the basis of the results,the relationship among the stress load,the crack propagation and the fractal dimension was found.The results showed that the value of fractal dimensions increased with the evolution of crack,so the fracture of the meso-structure was calculated as a quantitative parameter to research the meso-crack propagation.
引文
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[13]谢涛.基于CT实时观测的沥青混合料裂纹扩展行为研究[D].西南交通大学,2006Xie Tao.Study on crack propagation behavior of asphalt mixtures based on CT real-time observation[D].SouthwestJiaotong University,2006
[2]Stock S R,Naik N K,Wilkinson A P,et al.X-ray micro tomography(micro CT)of the progression of sulfate attack ofcement paste[J].Cement and Concrete Research,2002,32(10):1673-1675
[3]Chotard T J,Boncoeur-Martel M P,Smith A,et al.Application of X-ray computed tomography to characterize the earlyhydration of calcium aluminates cement[J].Cement&Concrete Composites,2003,25(1):145-152
[4]John S Lawer,Denis T Keane,Surendra P Shah.Measuring three-dimensional damage in concrete under compression[J].ACI Materials Journal,2001,98(6):465-475
[5]Wong R C K,Chau K T.Estimation of air void and aggregate spatial distributions in concrete under uniaxialcompression using computer tomography scanning[J].Cement and Concrete Research,2004,35:1566-1576
[6]陈厚群,丁卫华,蒲毅彬,等.单轴压缩条件下混凝土细观破裂过程的X射线CT实时观测[J].水利学报,2006,37(9):1044-1050Chen Houqun,Ding Weihua,Pu Yibin,et al.Real time observation on meso fracture process of concrete using X-ray CTunder uniaxial compressive condition[J].Journalof Hydraulic Engineering,2006,37(9):1044-1050
[7]丁卫华,陈厚群,张建军,等.高应变率作用下混凝土破裂过程的X射线CT观测[J].建筑结构学报,2006,(增刊2):758-762Ding Weihua,Chen Houqun,Zhang Jianjun,et al.X-ray CT detecting on concrete fracture process under high strain rate[J].Journal of Building Structures,2006,(supp2):758-762
[8]田威,党发宁,陈厚群.动力荷载作用下混凝土破裂特征的CT试验研究[J].地震工程与工程振动,2011,31(1):30-34Tian Wei,Dang Faning,Chen Houqun.CT experimental study on failure characteristics of concrete under dynamicloading[J].Journal of Earthquake Engneering and Engineering Vibration,2011,31(1):30-34
[9]田威,党发宁,陈厚群.混凝土CT图像的3维重建技术[J].四川大学学报,2010,42(6):12-16Tian Wei,Dang Faning,Chen Houqun.Research on three-dimension reconstruction technology of concrete based on CTimages[J].Journal of Sichuan University Engineering Science Edition,2010,42(6):12-16
[10]孙朝云,沙爱民,姚秋玲,等.沥青混合料图像阈值分割算法的实现[J].长安大学学报(自然科学版),2005,25(6):34-38Sun Zhaoyun,Sha Aimin,Yao Qiuling,et al.Realization of threshold segmentation algorithm in asphalt mixture[J].Journal of Chang’an University(Natural Science Edition),2005,25(6):34-38
[11]程应科.工程陶瓷磨削表面损伤图像检测技术研究[D].天津大学,2006Cheng Yingke.Studying the image detecting technology on the engineering ceramics grinding surface damage[D].Tianjin University,2006
[12]周尚志,党发宁,陈厚群,等.基于单轴压缩CT试验条件下混凝土破裂分形特性分析[J].水力发电学报,2006,26(5):112-117Zhou Shangzhi,Dang Faning,Chen Houqun,et al.Fractional characteristics of damage and fracture of concrete underthe uniaxial compression CT test[J].Journal of Hydroelectic Engineering,2006,26(5):112-117
[13]谢涛.基于CT实时观测的沥青混合料裂纹扩展行为研究[D].西南交通大学,2006Xie Tao.Study on crack propagation behavior of asphalt mixtures based on CT real-time observation[D].SouthwestJiaotong University,2006
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