TY - JOUR
T1 - Tensile and Flexural Behavior of Ultra-High Performance Concrete (UHPC) under Impact Loading
AU - Yao, Yiming
AU - Silva, Flavio A.
AU - Butler, Marko
AU - Mechtcherine, Viktor
AU - Mobasher, Barzin
N1 - Funding Information:
The research was sponsored by the Natural Science Foundation of Jiangsu Province (BK 20180383), National Natural Science Foundation of China Youth Program (51908120) and the Joint Funds of the National Natural Science Foundation of China (No.U1934205). We would like to appreciate our thanks to its financial support to this research.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - The rate-sensitive properties of ultra-high performance concrete (UHPC) subjected to flexural and direct tensile loads were investigated. Dynamic flexural tests were performed by means of a drop hammer impact machine, whereas a servo-hydraulic system was utilized to conduct direct tension tests. The absorbed energy of the UHPC specimens under flexure increased from 0.74 to 4.49 J as the input energy varied from 6.7 to 67 J. The load-bearing capacity and maximum flexural deformation exhibited identical trends as the input energy increased. The high-speed tensile properties, including strength, ductility, and energy dissipation capacity, improved upon increasing the strain rate up to 100 s-1. A nonuniform distribution of the deformation of UHPC specimens under high-speed tension was observed by identifying the zones of strain localization (near crack), uniform strain (far field), and shear lag (transition zone in between) using digital image correlation. The full-field data of displacement, strain, and strain rates were obtained and quantitatively evaluated. The results indicated that multiple mechanisms were involved in the rate-dependent behavior of the UHPC specimens.
AB - The rate-sensitive properties of ultra-high performance concrete (UHPC) subjected to flexural and direct tensile loads were investigated. Dynamic flexural tests were performed by means of a drop hammer impact machine, whereas a servo-hydraulic system was utilized to conduct direct tension tests. The absorbed energy of the UHPC specimens under flexure increased from 0.74 to 4.49 J as the input energy varied from 6.7 to 67 J. The load-bearing capacity and maximum flexural deformation exhibited identical trends as the input energy increased. The high-speed tensile properties, including strength, ductility, and energy dissipation capacity, improved upon increasing the strain rate up to 100 s-1. A nonuniform distribution of the deformation of UHPC specimens under high-speed tension was observed by identifying the zones of strain localization (near crack), uniform strain (far field), and shear lag (transition zone in between) using digital image correlation. The full-field data of displacement, strain, and strain rates were obtained and quantitatively evaluated. The results indicated that multiple mechanisms were involved in the rate-dependent behavior of the UHPC specimens.
KW - UHPC
KW - digital image correlation (DIC)
KW - failure localization
KW - flexural impact
KW - high-speed tensile test
KW - strain-rate field
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U2 - 10.1016/j.ijimpeng.2021.103866
DO - 10.1016/j.ijimpeng.2021.103866
M3 - Article
AN - SCOPUS:85102969174
SN - 0734-743X
VL - 153
JO - International Journal of Impact Engineering
JF - International Journal of Impact Engineering
M1 - 103866
ER -