灰浆
声发射
材料科学
极限抗拉强度
微观力学
离散元法
复合材料
骨料(复合)
结构工程
岩土工程
机械
工程类
复合数
物理
作者
Hua Zhang,Luo Yu Pan,Qi Pan,Chuan Jin,Shan Ji,Xin Yue Liu
出处
期刊:Journal of Materials in Civil Engineering
[American Society of Civil Engineers]
日期:2023-01-01
卷期号:35 (1)
被引量:1
标识
DOI:10.1061/(asce)mt.1943-5533.0004541
摘要
To study the splitting tensile damage characteristics of concrete, this paper conducted Brazilian disc split tensile tests on concrete and mortar with three water-cement ratios and four loading rates, respectively. Acoustic emission (AE) technology was used for real-time. The test results indicate that in the early loading stage of Brazilian disc specimens, a small number of microcracks are primarily generated at the interface between aggregate and mortar, and microcracks and macrocracks are generated simultaneously at the peak stress. The peak frequency characteristics of AE explain the strength enhancement principle and strain rate effect of concrete damage. The curves of AE cumulative ringing and AE energy counting reflect the internal damage activity of concrete and mortar specimens at different stress stages. Finally, a model that conforms to the macroscopic performance of the concrete dynamic splitting tensile test was established based on the discrete element method (DEM) and Hertz–Mindlin bond model. The simulation was compared with the actual analysis to verify the effectiveness of the parameters. The evolution of concrete damage space was studied through the discrete element simulation results, and the three evolution stages of damage space were summarized, which confirmed that the DEM plays an essential role in the field of micromechanics.
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