Progressive fracturing of concrete under biaxial confinement and repetitive dynamic loadings: From damage to catastrophic failure
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Authors
Wang, HC
Zhao, J
Li, J
Braithwaite, CH
Zhang, QB
Publication Date
2022Journal Title
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
ISSN
0734-743X
Publisher
Elsevier BV
Volume
165
Number
104232
Pages
104232-104232
Type
Article
This Version
AM
Metadata
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Wang, H., Zhao, J., Li, J., Braithwaite, C., & Zhang, Q. (2022). Progressive fracturing of concrete under biaxial confinement and repetitive dynamic loadings: From damage to catastrophic failure. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 165 (104232), 104232-104232. https://doi.org/10.1016/j.ijimpeng.2022.104232
Abstract
Concrete materials are frequently exposed to extreme environments, such as high confining pressures (e.g., deep underground support), dynamic loadings (e.g., natural phenomena and human-induced events), and coupled confinement and dynamic loadings. The behaviours of concrete materials under such conditions result in challenges for the diagnosis and prognosis of structural changes from local damage to catastrophic failure, which is critical to the safety and sustainability of civil infrastructures. This paper aims to explore mechanical properties and progressive fracturing of concrete materials subjected to biaxial confinement and repetitive dynamic loadings. A triaxial Hopkinson bar (Tri-HB) system is used to apply the coupled loading conditions, and obtain the dynamic stress-strain information by interpreting recorded stress-wave signals. Non-destructive evaluation (NDE) techniques, including ultrasonic measurement and synchrotron-based micro-computed tomography (micro-CT), are utilised to quantify progressively damage evolution and fracture characteristics. The digital volume correlation (DVC) and imaging processing techniques are further applied to compute volume deformation fields and to classify microcrack types (i.e., matrix crack, interfacial crack and transgranular cracks). Results show that, with increasing the number of impacts, dynamic peak stress decreases along the impact direction but increases along the lateral direction while the peak strain values increase in both directions. The microcracks firstly initiate at the middle of rear-end of the specimen, continuously propagate along the impact direction, then develop at the top and bottom of the specimen, and eventually coalesce with the occurrence of shear sliding. The observation of microcracks are well validated by ultrasonic measurement. The formation of shear bands was highly dependent on the propagation and coalescence of interfacial and matrix cracks, while transgranular cracks induced by compressive strain localization as displayed in DVC deformation fields play an essential role in the fracture energy under repetitive dynamic loadings.
Embargo Lift Date
2023-03-30
Identifiers
External DOI: https://doi.org/10.1016/j.ijimpeng.2022.104232
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335848
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/
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