Date of Award

3-22-2007

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Anthony N. Palazotto, PhD

Abstract

Hydrocodes are valuable tools in the modeling of shock wave propagation through solids due to high speed impact phenomena. CTH is a hydrocode built with the ability to use multiple EOSs, including the semi-emperical Mie-Gruneisen EOS and tabular Sesame EOS. Modeling high speed impacts necessitates modeling the non-equilibrium thermodynamic states caused by these impacts. A discussion of the non-equilibrium thermodynamics that may be applied to the region directly behind a shock wave is presented, including details of recent attempts to model non-equilibrium impact phenomena in solids. Also, in order to better determine the applicability of the Mie-Gruneisen EOS anbd the two state PTRAN EOS and the Sesame EOS in situations that include non-equilibrium thermodynamics, the high speed, uniaxial impacts between two iron bars are modeled in CTH. The differences between the Mie-Gruneisen EOS and the Sesame EOS are established. A finite volume uniaxial hydrocode is validated. Finally, CTH is shown to be able to model some irreversibilities occurring in impact phenomena.

AFIT Designator

AFIT-GAE-ENY-07-M25

DTIC Accession Number

ADA468308

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