Evaluation of 3D deformation field in siltstone with a pre-existing 3D surface flaw under uniaxial compression using X-ray computed tomography and digital volumetric speckle photography

被引：4
|
作者：
Mao, Lingtao [1 ,2 ]
Lei, Yu [2 ]
Ding, Leilei [2 ]
Wu, Jingcheng [2 ]
Li, Liyun [2 ]
Yang, Min [3 ]
Ju, Yang [1 ]
Chiang, Fu-pen [4 ]
机构：
[1] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China
[2] China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China
[3] Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
[4] SUNY Stony Brook, Dept Mech Engn, Lab Expt Mech Res, Stony Brook, NY 11794 USA
来源：
MEASUREMENT | 2022年 / 189卷
基金：
中国国家自然科学基金;
关键词：
3D strain field; Digital volume correlation; 3D surface flaw; X-ray computed tomography; ROCK-LIKE MATERIAL; CRACK COALESCENCE; FRACTURE COALESCENCE; STRESS-FIELD; BEHAVIOR; SANDSTONE; SPECIMENS; STRAIN; SINGLE; VISUALIZATION;
D O I：
10.1016/j.measurement.2021.110484
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The interior deformation or rupture of materials is usually derived from measuring the surface deformation of specimens. In this study, a set of uniaxial compression tests combined with in situ X-ray computed tomography (CT) was performed on siltstone specimens with a pre-existing three-dimensional (3D) surface flaw with various inclination angles (alpha = 30 degrees, 45 degrees, 60 degrees). The ratio of flaw depth to specimen thickness was 0.26. Based on the CT images of the specimens under different loads, the digital volumetric speckle photography procedure was applied to quantifying the 3D interior deformation of the specimens, and 3D displacement and major principal strain epsilon(1) distribution in different sections were determined. The characteristics of internal strain before specimen fracturing indicated strain localization, which could describe the propagation mechanism of the single 3D surface flaw.
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收藏
页数：14
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