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Open AccessArticle

Microscopic Multiple Fatigue Crack Simulation and Macroscopic Damage Evolution of Concrete Beam

by Baijian Wu 1,2, Zhaoxia Li 1,2, Keke Tang 3,* and Kang Wang 2
1
Jiansu Key Laboratoryof Engineering Mechanics, Southeast Uiversity, Nanjing 210096, China
2
Department of Engineering Mechanics, Southeast University, Nanjing 210096, China
3
School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(21), 4664; https://doi.org/10.3390/app9214664
Received: 5 October 2019 / Revised: 24 October 2019 / Accepted: 31 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Fracture and Fatigue Assessments of Structural Components)
Microcracks in concrete can coalesce into larger cracks that further propagate under repetitive load cycles. Complex process of crack formation and growth are essentially involved in the failure mechanism of concrete. Understanding the crack formation and propagation is one of the core issues in fatigue damage evaluation of concrete materials and components. In this regard, a numerical model was formulated to simulate the thorough failure process, ranging from microcracks growth, crack coalescence, macrocrack formation and propagation, to the final rupture. This model is applied to simulate the fatigue rupture of three-point bending concrete beams at different stress levels. Numerical results are qualitatively consistent with the experimental observations published in literature. Furthermore, in the framework of damage mechanics, one damage variable is defined to reflect stiffness reduction caused by fatigue loading. S-N curve is subsequently computed and the macroscopic damage evolution of concrete beams are achieved. By employing the combined approaches of fracture mechanics and damage mechanics, made possible is the damage evolution of concrete beam as well as the microscopic multiple fatigue crack simulation. The proposed approach has the potential to be applied to the fatigue life assessment of materials and components at various scales in engineering practice. View Full-Text
Keywords: microcracks; multiple fatigue crack; crack coalescence; concrete beams; damage evolution microcracks; multiple fatigue crack; crack coalescence; concrete beams; damage evolution
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Wu, B.; Li, Z.; Tang, K.; Wang, K. Microscopic Multiple Fatigue Crack Simulation and Macroscopic Damage Evolution of Concrete Beam. Appl. Sci. 2019, 9, 4664.

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