期刊
THEORETICAL AND APPLIED FRACTURE MECHANICS
卷 108, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.tafmec.2020.102575
关键词
Concrete; Low temperature; 3D digital image correlation; Fracture process zone; Crack propagation
资金
- National Key Research and Development Program of China [2016YFC0401902]
- National Major Scientific Instruments Development Project of China [51527811]
- State Key Program of National Natural Science of China [51739008]
The three-point bending tests of concrete specimens at different temperature levels (20 degrees C, 0 degrees C, - 20 degrees C, and -40 degrees C) were performed using a low-temperature fracture test system. The 3D digital image correlation (3D-DIC) technique was employed to measure the surface deformations of the beams during fracture process. Combined with the displacement fields obtained from 3D-DIC, the crack propagation lengths and crack widths at different loading points were determined, providing information for the fracture process zone (FPZ) evolution in concrete at different temperatures. The results revealed that temperature has significant effect on the crack propagation, i.e. the average FPZ length in the later stage of unloading and the critical crack length a(c) decrease with decreasing temperature. In addition, the FPZ length for specimens at 0 degrees C, - 20 degrees C and -40 degrees C decreases slowly in the initial stage and then decreases significantly when the crack extends to the specimen boundary.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据