Title

Effect of particle damage on wave propagation in granular materials

Document Type

Conference Proceeding

Date of Original Version

12-1-1997

Abstract

A preliminary numerical study is conducted to investigate the effect of particle damage on wave propagation in granular materials. The discrete element method is employed to simulate the dynamic load transfer processes involved during the passage of waves through model granular systems of circular particles. Damage is modeled by incorporating interparticle contact laws which exhibit softening behaviors related to the amount of damage present during the dynamic interaction event. Using a non-linear hysteretic normal contact law, the study establishes a damage threshold and a subsequent softening interparticle contact response. A simple maximum normal stress theory applicable for brittle particles is used to establish the damage threshold for each particle. The softening model allows for a variety of damage behavior to occur, and offers a total softening response for the most severe case. Discrete element simulation results are conducted on several one and two-dimensional model granular systems using several different damage/softening models. Results generally indicated that the presence of damage leads to significant changes in the wave propagational behavior. Specifically, more severe attenuation occurs in damaged particulate media, and the wave speed is generally reduced.

Publication Title

ASME-ASCE-SES Joint Summer Meeting

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