Influence of Contact Behavior on Stress Wave Velocity and Energy in Granular Materials

doi:10.12068/j.issn.1005-3026.2021.08.011

Abstract

Abstract: The discrete element method is used to study the energy attenuation and wave velocity change of granular system in the process of wave propagation with linear-elastic contact model， Hertz contact model and linear parallel bond contact model. Meanwhile， the influences of elastic modulus on wave propagation in granular materials are also studied. Finally， the Hertz contact model is used to study the wave velocity and the energy attenuation of granular materials under different confining pressures. The results show that the wave velocity and energy attenuation rate of wave propagation are different with different contact models; when the sample is arranged from regular to random， the wave velocity is smaller and the energy attenuation rate is larger; with the increase of elastic modulus of particles， the wave velocity increases logarithmically; in the process of wave propagation， the energy dissipates rapidly， and with the increase of confining pressure， the wave velocity and energy attenuation rate both increase.

Key words: granular material; discrete element; wave propagation; contact model; confining pressure

CLC Number:

PAN Yu， WANG Jiao， CHU Xi-hua. Influence of Contact Behavior on Stress Wave Velocity and Energy in Granular Materials[J]. Journal of Northeastern University(Natural Science), 2021, 42(8): 1136-1142.

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