Attenuation Law of Stress Wave in Granular Particles.

Brittle loose particles exhibit very complex mechanical behavior during the crushing process and have a significant attenuation effect on the stress wave propagation. In order to explore the attenuation law, this paper builds a brittle loose particle model based on the discrete element software PFC^3D, and studies the attenuation of stress wave on the microscopic scale. The results show that: under shock loading, the peak value of the stress wave propagating in the granular particles decays exponentially. As the propagation distance increases, the degree of stress wave attenuation gradually decreases, and the degree of particle fragmentation also decreases. Stress wave propagation in granular particles will cause significant wave dispersion, and the shorter the wavelength of the stress wave, the greater the attenuation during propagation. The rate dependence of the stress wave attenuation is essentially caused by the impact fragmentation of the granular particles. The faster the loading speed, the greater degree of particle damage, and the greater the attenuation of stress wave. When the particle is not broken, the degree of attenuation does not change significantly with the increase of the loading velocity. [ABSTRACT FROM AUTHOR]