期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 45, 期 2, 页码 400-410出版社
WILEY
DOI: 10.1111/ffe.13602
关键词
aggregate volume content; concrete; crack deflection; digital image correlation; fracture toughness; maximum aggregate size
资金
- National Natural Science Foundation of China [51779069, 51779095, 51879286]
- Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin [IWHRSKL-201618]
- National Key R&D Program of China [2016YFC0401907]
- Key Project of University Science and Technology Research of Hebei Province [ZD2019072, ZD2020190]
A new method was proposed to determine the mixed mode fracture toughness of concrete, which showed that KI+II values increase with specimen size and decrease with maximum aggregate size. The use of crack deflection resulted in higher KI+II values, and a monotonic loading process was sufficient for determining KI+II.
An experimental method, based on the modified two-parameter model and digital image correlation technique, was proposed for determining the mixed mode fracture toughness (KI+II) of concrete. Three-point bending tests on notched concrete beam specimens of different sizes, maximum aggregate sizes, and aggregate volume contents were conducted, and the values of KI+II were evaluated considering the crack deflection. The values of KI+II and K-I under mode I loading were compared. The results show that KI+II increases with the specimen size and gradually stabilizes. In addition, KI+II decreases with the maximum aggregate size, but the aggregate volume content has little effect on KI+II. Higher values of KI+II are presented after considering the effect of crack deflection. Only a monotonic loading process is required for the proposed method to determine KI+II.
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