Influence of the Microstructure of Granular Media on Wave Propagation and Dynamic Load Transfer

摘要

Dynamic load transfer in granular material occurs essentially through contact mechanisms between each grain. This phenomenon is quite a complex process and depends inherently on the microstructural packing arrangement of the media. An experimental investigation is conducted to study wave propagation in systematic aggregates of disc assemblies. Attention is focused on load transfer path, wave velocities, wave attenuation and the stresses which are generated at the contacts due to the passage of stress waves. the stress distribution in the granular media which is subjected to explosive loading. The granular media is simulated by circular discs made of photoelastic materials. Several systematic arrangements of these discs are used in different experiments. The results show that the load transfer phenomenon depends strongly on the microstructure of the media simulated by circular discs made of photoelastic materials. Several systematic arrangements of these discs are used. Experiments are performed with initially unstressed media as well as media with prestress. Reprints. (jhd)