Analysis of dynamic mechanics and energy characteristics of concrete impact failure

DANG Faning; LI Yutao; REN Jie; ZHOU Mei

doi:10.11883/bzycj-2021-0444

Volume 42 Issue 8

Sep. 2022

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DANG Faning, LI Yutao, REN Jie, ZHOU Mei. Analysis of dynamic mechanics and energy characteristics of concrete impact failure[J]. Explosion And Shock Waves, 2022, 42(8): 083202. doi: 10.11883/bzycj-2021-0444

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DANG Faning, LI Yutao, REN Jie, ZHOU Mei. Analysis of dynamic mechanics and energy characteristics of concrete impact failure[J]. Explosion And Shock Waves, 2022, 42(8): 083202. doi: 10.11883/bzycj-2021-0444

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Analysis of dynamic mechanics and energy characteristics of concrete impact failure

doi: 10.11883/bzycj-2021-0444

Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi, China

Received Date: 2021-10-28
Rev Recd Date: 2022-01-25

Available Online: 2022-08-10

Publish Date: 2022-09-09

Abstract

Abstract

To investigate the mechanics, deformation, and energy evolution characteristics of concrete under dynamic loading, impact compression tests at impact velocities of 5, 6, and 7 m/s, and splitting tensile tests at 4 m/s were carried out on concrete specimens with aggregate volume rates of 0, 32%, 37%, and 42% using a 100 mm diameter split Hopkinson pressure bar (SHPB) device. The failure process of concrete specimens was acquired by a high-speed camera, and the damaged concrete fragments were collected and sorted. Furthermore, the fractal dimension of fragments was calculated by dividing the fragments into different grades. The stress and strain of the concrete specimen were obtained through the corresponding calculation formulas. The relationships between specimen deformation, dynamic strength, and fractal dimension with impact velocity and aggregate rate were studied, and the expression for dynamic strength with respect to impact velocity and aggregate rate was developed. In addition, the fractal dimension was used to characterize the surface roughness of the concrete fragments, and the function expression between crack surface energy and fractal dimension was established. The relationship between sample absorption energy and crack surface energy was analyzed and compared. The results show that deformation hysteresis occurs when concrete specimens are destroyed and the failure is mainly in the form of splitting tensile damage. The dynamic strength increases with the increase of impact velocity and aggregate ratio, the dynamic strength of concrete can be better predicted by using the proposed dynamic strength formula. The fractal dimension of concrete breaking fragments, absorbed energy and crack surface energy all increase with the increase of impact velocity and decrease with the increase of aggregate rate, and the absorbed energy is always higher than the crack surface energy. The highest conversion rate of absorbed energy is achieved when the aggregate rate is 37%, with approximately 91% converts to crack surface energy.
- concrete,
- dynamic strength,
- aggregate rate,
- impact velocity,
- crack surface energy

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References

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