Dynamic compression tests and damage analysis for ultrahigh performance concrete

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (9) : 115-120.

LIU Jixuan1, CHEN Xudong1, SHI Dandan1, WANG Luyao2, NING Yingjie2, GAN Yuannan3

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Abstract

In order to explore the damage characteristics of ultra-high performance concrete (UHPC) under dynamic compression, the dynamic compressive mechanical properties of UHPC under different strain rates (52 /s ~ 368 /s) were studied by split Hopkinson pressure bar (SHPB) device, and the failure process of the specimen was analyzed based on DIC technology. The failure process of the specimen was analyzed based on high-speed camera and DIC technology. The results show that Under the impact load, the UHPC specimen can still remain intact after failure. The dynamic compressive strength and toughness of UHPC show obvious strain rate sensitivity. With the increase of strain rate, steel fiber can better absorb impact energy and restrain the increase of critical strain. Under different strain rates, the early development rate of cracks is basically the same, and the final width of cracks increases with the increase of strain rate. The crack development is greatly affected by the strain rate, and the final width of the crack increases with the increase of the strain rate. The final width of the crack at low strain rate is not its maximum width. This study provides a theoretical support for the service performance and damage assessment of UHPC.

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ultra-high performance concrete / split Hopkinson pressure bar / digital image correlation / dynamic impact test / the strain rate / impact resistance

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LIU Jixuan1, CHEN Xudong1, SHI Dandan1, WANG Luyao2, NING Yingjie2, GAN Yuannan3. Dynamic compression tests and damage analysis for ultrahigh performance concrete[J]. Journal of Vibration and Shock, 2024, 43(9): 115-120

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