基于CT三维重构技术的沥青混凝土疲劳损伤演化  

Fatigue damage evolution of asphalt concrete based on CT 3D reconstruction technology

作　　者：周兴林[1,2,3] 刘洋 柳璐[1,2,3] ZHOU Xing-li;LIU Yang;LIU Lu(School of Mechanical Automation,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory of Metallurgical Equipment and Control Technology,Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学机械自动化学院,武汉430081 [2]武汉科技大学机械传动与制造工程湖北省重点实验室,武汉430081 [3]武汉科技大学教育部冶金设备与控制技术重点实验室,武汉430081

出　　处：《吉林大学学报(工学版)》2024年第11期3192-3198,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51778509,51827812,52172392)。

摘　　要：由于沥青混凝土内部结构极其复杂,会在不同疲劳阶段呈现出不同的变化特征,为了解沥青混凝土的疲劳损伤演化过程,在CT三维重构技术的基础上对其展开研究。对沥青混凝土展开疲劳实验,得到不同疲劳阶段的CT扫描图像和三维重构图像;利用差分盒维数法计算CT三维重构图像分形维数,得到疲劳损伤次数与分形维之数间的关系;利用Miner线性疲劳损伤模型重新定义沥青混凝土的损伤变量,得到疲劳损伤演化过程呈线性变化的结论。通过构造环氧沥青混凝土试件展开实验测试,结果表明:本文方法能准确计算出沥青混凝土压缩位移和裂缝体积与疲劳损伤之间的关系,推理得到沥青混凝土的疲劳损伤演化过程。Due to the extremely complex internal structure of asphalt concrete,it exhibits different changing characteristics at different fatigue stages.In order to obtain the fatigue damage evolution process of asphalt concrete,research was conducted based on CT three-dimensional reconstruction technology.Conducting fatigue tests on asphalt concrete,obtaining CT scan images and 3D reconstruction images of different fatigue stages;The difference box dimension method is used to calculate the Fractal dimension of 3D CT reconstruction image,and the relationship between fatigue damage times and Fractal dimension is obtained;Using Miner's linear fatigue damage model to redefine the damage variables of asphalt concrete,it is concluded that the fatigue damage evolution process exhibits linear changes.By constructing epoxy asphalt concrete specimens for experimental testing,the results show that the proposed method can accurately calculate the relationship between compressive displacement and crack volume of asphalt concrete and fatigue damage,and infer the fatigue damage evolution process of asphalt concrete.

关 键 词：CT三维重构技术 沥青混凝土疲劳损伤 损伤变量 线性变化 

分 类 号：U334[交通运输工程]