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Dynamic damage constitutive model for UHPC with nanofillers at high strain rates based on viscoelastic dynamic constitutive model and damage evolution equation

Yan, D.
; 
Qiu, L.
; 
Wang, J.
; ; 
Wang, X.
Publication Date
2024-04-15
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Keywords
Ultra-high performance concrete, Nanofillers, Stress-strain curve, Dynamic damage constitutive model, Damage factor
Rights
© 2024 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2023-12-30
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Engineering and Digital Technology Publications
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Abstract
This study established a dynamic damage constitutive model for ultra-high performance concrete (UHPC) with nanofillers, based on a viscoelastic dynamic constitutive model and a damage evolution equation. Ten types of nanofillers, including particle, tube and flake nanofillers, were incorporated to modify UHPC. The split Hopkinson pressure bar was used to obtain the relationship between stress and strain of UHPC specimens at a strain rate of 200/s-800/s. The experimental results indicated that the dynamic compressive strength of UHPC with nanofillers at strain rates of approximately 200/s, 500/s, and 800/s can reach 172.8 MPa, 219.6 MPa, and 275.9 MPa, respectively, reflecting an increase of 85.2 %, 76.5 %, and 53.9 % compared with the blank UHPC. The established dynamic damage constitutive model considered the damage accumulation with strains under dynamic loading. The fitting coefficients of the dynamic damage constitutive model, when compared against experimental results, range from 0.8796 to 0.9963, showing a higher accuracy compared with traditional Zhu-Wang-Tang (ZWT) viscoelastic model, especially at a strain rate of approximately 200/s.
URI
http://hdl.handle.net/10454/19936
Version
Accepted manuscript
Citation
Yan D, Qiu L, Wang J et al (2024) Dynamic damage constitutive model for UHPC with nanofillers at high strain rates based on viscoelastic dynamic constitutive model and damage evolution equation. Journal of Building Engineering. 83: 108428.
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https://doi.org/10.1016/j.jobe.2023.108428
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Article
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