Band gap features of metaconcrete and shock wave attenuation in it

ZHANG En; LU Guoyun; YANG Huiwei; CAO Ruidong; CHEN Pengcheng

doi:10.11883/bzycj-2019-0252

Volume 40 Issue 6

Jun. 2020

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ZHANG En, LU Guoyun, YANG Huiwei, CAO Ruidong, CHEN Pengcheng. Band gap features of metaconcrete and shock wave attenuation in it[J]. Explosion And Shock Waves, 2020, 40(6): 063301. doi: 10.11883/bzycj-2019-0252

Citation:

ZHANG En, LU Guoyun, YANG Huiwei, CAO Ruidong, CHEN Pengcheng. Band gap features of metaconcrete and shock wave attenuation in it[J]. Explosion And Shock Waves, 2020, 40(6): 063301. doi: 10.11883/bzycj-2019-0252

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Band gap features of metaconcrete and shock wave attenuation in it

doi: 10.11883/bzycj-2019-0252

1.
College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
3.
Department of Civil Engineering, Shanxi University, Taiyuan 030013, Shanxi, China

Received Date: 2019-06-25
Rev Recd Date: 2020-04-26

Available Online: 2020-05-25

Publish Date: 2020-06-01

Abstract

Abstract

Based on the research ideas of metamaterials, a novel concrete with wave-absorbing features was designed by introducing local resonant aggregates into plain concrete. First, the effective mass of the designed metaconcrete was calculated by means of structural dynamics. Simplified models for the start and cutoff frequencies of the band gap in the metaconcrete were established, and the theoretical expressions for the band gap start and cutoff frequencies were proposed. The effects of the following parameters on the band gap features of the metaconcrete were analyzed by the proposed theoretical models, including the coating elastic modulus, core density, matrix density, aggregate volume ratio, and ratio of core length to soft thickness. Finally, the numerical simulations were carried out to compare the attenuation effects of shock waves in the metaconcrete to those in the plain concrete. The research results reveal that the flexible coating results in a low-frequency attenuation domain, but the width of the attenuation domain is narrow; while the high elastic modulus coating can form a wider attenuation domain, but the attenuation domain has a higher start frequency. A low frequency and wide band gap can be obtained by selecting large-density core material and small-density matrix material. A wide band gap can be achieved by increasing the proportion of aggregate volume and the ratio of core length to soft thickness. Compared with the plain concrete, the metaconcrete has a better attenuation effect on shock wave.
- metaconcrete,
- band gap feature,
- start frequency,
- cutoff frequency,
- attenuation

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References(23)

References

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