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Dissertation/Thesis Abstract

A study of mesoscale simulations for planar shock experiments on heterogeneous granular materials
by Schumaker, Merit G., M.S., Marquette University, 2015, 131; 1586546
Abstract (Summary)

There is an interest in producing accurate and reliable computer simulations to predict the dynamic behavior of heterogeneous materials and to use these simulations to gain further insight into experimental results. In so doing, a more complete understanding of the multiple-length scales involved in heterogeneous material compaction can be obtained. Mesoscale computer simulations of dynamically shocked materials have proven to be a beneficial resource in unraveling data not observed in planar shock impact experiments, such as stress and temperature interactions between grains.

The modeled mono-dispersed geometry of particles, the densities of each material, equations of state, material properties and many other factors affect the simulated outcomes. By studying and analyzing these variables, many of which highlight the difference between experimental and simulated results, there manifests additional insight into the shock dynamics of the different heterogeneous granular materials. The heterogeneous materials in this study were created both by a "shake and pack" method, where individual grains were randomly seeded into the computational domain and grown until the grains matched the experimental volume fraction and average diameter.

Three planar shock experiments were utilized to validate simulation models and parameters: 1. Brake pad powder compaction at Marquette University, 2. Dry sand experiments at Georgia Tech, and 3. Release of dry sand at Cambridge University. Planar shock impact experiments were simulated using two different hydrocode packages: CTH and iSALE. Validated models are then used to setup future dry, water, and possible ice saturated sand release experiments. Particle velocity and stress traces obtained from the computer simulations were compared to VISAR, PDV, and Manganin gage measurements obtained from experiments. The results from simulations are compared to experiments and discussed in this document.

Indexing (document details)
Advisor: Borg, John P.
Commitee: Allen, Casey, Mathison, Margaret, Rice, James
School: Marquette University
Department: Mechanical Engineering
School Location: United States -- Wisconsin
Source: MAI 54/04M(E), Masters Abstracts International
Subjects: Mechanical engineering, Theoretical physics
Keywords: Dynamic behavior of materials, Heterogenous granular materials, Mesoscale, Planar impact, Shock physics, Simulations
Publication Number: 1586546
ISBN: 978-1-321-68375-2
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