| 动载作用下混凝土细观损伤的CT图像分割和灰度共生矩阵特征值研究 |
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| 引用本文： | 丁卫华,朱琳,黄力,张乐,秦俊绒,李爱国.动载作用下混凝土细观损伤的CT图像分割和灰度共生矩阵特征值研究[J].CT理论与应用研究,2021,30(2):170-182. |
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| 作者姓名： | 丁卫华 朱琳 黄力 张乐 秦俊绒 李爱国 |
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| 作者单位： | 西安理工大学西北旱区生态水利国家重点实验室, 西安 710048 |
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| 基金项目： | 国家自然科学基金（50649028；50979092）。 |
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| 摘 要： | 动载作用下混凝土随应力变化的系列CT图像完整地记录了混凝土内部破损过程，在CT图像中能直接观察到细观裂纹时混凝土往往已发生宏观破坏，挖掘混凝土材料损伤的细观信息是混凝土细观力学分析的核心。本文基于混凝土单轴动态压缩CT试验，获得不同应力阶段的横断面CT图像，分别应用图像分割技术和灰度共生矩阵法提取孔隙率和4个特征值，研究孔隙率和4个特征值随应力的变化规律。结果表明孔隙率随应力的增加显示出单调增加的总趋势，个别部位在应力水平较小时孔隙率随应力增加变化不大，反映出混凝土的压密效应。受压密效应影响，对比度在低应力水平时随应力增加有升有降，能量对应力变化不够敏感，相关性和同质性随应力的增加单调增加，对应力变化较为敏感，能反映混凝土整体损伤过程。对混凝土CT图像进行分区后再研究孔隙率、同质性和相关性随应力的变化，可以更好地反映动载作用下混凝土的细观损伤过程。
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| 关 键 词： | CT图像 图像分割 灰度共生矩阵 孔隙率 特征值 |
| 收稿时间： | 2020-12-30 |
Study on Concrete Mesoscopic Damage Under Dynamic Loading Using CT Image Segmentation and Gray Level Co-occurrence Matrix Eigenvalue |
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| DING Weihua,ZHU Lin,HUANG Li,ZHANG Le,QIN Junrong,LI Aiguo.Study on Concrete Mesoscopic Damage Under Dynamic Loading Using CT Image Segmentation and Gray Level Co-occurrence Matrix Eigenvalue[J].Computerized Tomography Theory and Applications,2021,30(2):170-182. |
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| Authors: | DING Weihua ZHU Lin HUANG Li ZHANG Le QIN Junrong LI Aiguo |
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| Affiliation: | State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China |
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| Abstract: | The process of concrete internal damage development to fracture is completely recorded by series CT images of concrete under dynamic loading.However,macroscopic damage of concrete has occurred when the microscopic cracks can be observed at CT image.The core of concrete CT image analysis is to excavate the microscopic damage information in concrete damage stages.In this research,image segmentation technology and gray co-occurrence matrix theory(GLCM) were used to extract the porosity and four eigenvalues(contrast,energy,correlation and homogeneity) respectively to study the change law of these parameters with stress in different cross sections under uniaxial dynamic compression using CT.Results show that porosity presents a general trend of monotonous increase with the increase of stress,while the porosity in some parts shows little change with the increase of stress when the stress level is small,which reflects the influence of concrete density compression effect.Contrast increases and decreases with the increase of stress at low stress level due to the influence of density compression effect.The index of energy is not sensitive to stress change.Correlation and homogeneity increase monotonously with the increase of stress,which are more sensitive for reflecting the whole damage process of concrete.This study shows that the sectionalized porosity,homogeneity and correlation of GLCM is helpful to reflect the mesoscopic damage process of concrete under dynamic load. |
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