Three-Dimensional Dynamic Loading of Sand
Final rept. May 2009-Feb 2011
MARQUETTE UNIV MILWAUKEE WI DEPT OF MECHANICAL ENGINEERING
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The objective of this work was to assess the ability of Eulerian hydrocode simulations to model the rapid compaction of loose dry granular sand at moderate strain-rates on the order of 103 s-1. The simulated results are compared to data obtained from Hopkinson bar experiments. Simulations were conducted in two configurations three-dimensional mesoscale simulations and one-dimensional continuum simulations with the inclusion of a porosity model. The goal of the simulations was not to reproduce the experimental results by adjusting material or model properties but rather determine a baseline mesoscale solution given bulk material properties of quartz. An additional goal was to probe the parameter space to determine what physical mechanisms are most essential to reproducing experimental data. It was found that even at these relatively low strain rates, the dynamic yield strength of the underlying material quartz had to be increased above the static strength yield strength of 40 MPa. In addition the inclusion of grain-on-grain stiction friction plays a major role in the compaction of sand at low strain rates.
- Ceramics, Refractories and Glass
- Numerical Mathematics
- Structural Engineering and Building Technology