期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 153, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106508
关键词
Concrete fatigue; Stochastic damage; Energy analysis; Microcrack; Nanocrack
资金
- National Natural Science Foundation of China [51538010]
- Shanghai Municipal Education Commission [02102360152]
By introducing the concept of microscale damage and the material parameter nano-to-micro comprehensive fracture energy, the microscopic stochastic fracture model is extended and successfully simulates the stress-strain curve of concrete, predicting properties such as fatigue life and stiffness degradation under various loading conditions.
The microscopic stochastic fracture model is extended by introducing a concept of microscale damage, whose evolution law is derived by an energy analysis on the propagation of the cracks from nano- to microscale. A material parameter termed nano-to-micro comprehensive fracture energy is found to play a key role in the random and nonlinear behavior of concrete. It is shown that the proposed model can simulate the mean and standard deviation of the complete stress-strain curve of concrete very well. Moreover, the fatigue life, stiffness degradation and their inherent randomness under various loading conditions can be well predicted by the model.
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