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dc.contributor.authorWang, HC
dc.contributor.authorZhao, J
dc.contributor.authorLi, J
dc.contributor.authorBraithwaite, CH
dc.contributor.authorZhang, QB
dc.date.accessioned2022-04-06T23:30:37Z
dc.date.available2022-04-06T23:30:37Z
dc.date.issued2022
dc.identifier.issn0734-743X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/335848
dc.description.abstractConcrete 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.
dc.publisherElsevier BV
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleProgressive fracturing of concrete under biaxial confinement and repetitive dynamic loadings: From damage to catastrophic failure
dc.typeArticle
dc.publisher.departmentDepartment of Physics
dc.date.updated2022-04-06T09:04:13Z
prism.endingPage104232
prism.number104232
prism.publicationDate2022
prism.publicationNameINTERNATIONAL JOURNAL OF IMPACT ENGINEERING
prism.startingPage104232
prism.volume165
dc.identifier.doi10.17863/CAM.83281
dcterms.dateAccepted2022-03-28
rioxxterms.versionofrecord10.1016/j.ijimpeng.2022.104232
rioxxterms.versionAM
dc.contributor.orcidBraithwaite, Christopher [0000-0002-9916-3883]
dc.identifier.eissn1879-3509
rioxxterms.typeJournal Article/Review
cam.issuedOnline2022-03-30
cam.orpheus.success2022-04-06 - Embargo set during processing via Fast-track
cam.depositDate2022-04-06
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2023-03-30


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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International