ANALYSIS OF WAVE BEHAVIOR AND DEFORMATION CHARACTERISTICS OF GRANULAR MATERIALS IN PRO-BORDER ZONE UNDER IMPACT LOAD

Wang Jiao; Chu Xihua

doi:10.6052/0459-1879-21-242

Volume 53 Issue 9

Sep. 2021

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Wang Jiao, Chu Xihua. Analysis of wave behavior and deformation characteristics of granular materials in pro-border zone under impact load. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(9): 2395-2403 doi: 10.6052/0459-1879-21-242

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Wang Jiao, Chu Xihua. Analysis of wave behavior and deformation characteristics of granular materials in pro-border zone under impact load. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(9): 2395-2403 doi: 10.6052/0459-1879-21-242

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ANALYSIS OF WAVE BEHAVIOR AND DEFORMATION CHARACTERISTICS OF GRANULAR MATERIALS IN PRO-BORDER ZONE UNDER IMPACT LOAD

doi: 10.6052/0459-1879-21-242

Wang Jiao^*
,,
Chu Xihua^†

*.
School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 611756, China
†.
School of Civil Engineering and Architecture, Wuhan University, Wuhan 430072, China

Funds: The project was supported by the National Natural Science Foundation of China Youth Fund Project (Grant NO. 11902228, 11772237) and the Fundamental Research Funds For Central Universities (Grant NO. 2682021CX083)

Received Date: 2021-05-31
Accepted Date: 2021-07-12

Available Online: 2021-07-13

Publish Date: 2021-09-18

Abstract

Abstract

The study of wave propagation in granular materials is of great significance in metamaterial manufacturing. The boundary design of wave-conducting metamaterials needs to consider the reflection and absorption of stress waves. First, the wave propagation behavior in a one-dimensional particle chain has been studied. According to the difference in the maximum kinetic energy that the particles can obtain at different positions from the boundary, the definition of the boundary area is given. Then the stress wave propagation behaviors of multiple sets of two-dimensional particle samples under impact load are analyzed. The influences of different boundary shapes and particle arrangement on the propagation behavior of stress waves in the pro-border zone have been considered. The results show that the arrangement of particles in the pro-border zone mainly affects the relative position and local porosity of particles near the boundary. The stress wave reflected by the boundary propagates directly in the pro-border zone in the shape of the boundary line. The more complicated the boundary situation (high local porosity, random arrangement of particles), the more accurate the conclusion. The wave velocity mainly determines the shape of the wave-front outside the pro-border zone, i.e., in the material center area. The convergence effect of the arc boundary on the wave reflection and the dispersion effect caused by the arrangement of the particles in the pro-border zone are two competing factors, which together determine the reflection process of the wave in the pro-border zone. Finally, the changes of the force chain network in the pro-border zone before and after reflection are analyzed. The distribution of kinetic energy intuitively reflects the phenomenon of reflection hysteresis. The process of particle contact and rebound in the boundary area corresponds to the storage and release of energy. This research will provide reference for the handling of boundary problems in metamaterial design.
- granular materials,
- DEM,
- pro-border zone,
- stress wave reflection,
- wave-front shape

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References(33)

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