Electronic Theses and Dissertations

Date of Award

2012

Document Type

Dissertation

Degree Name

M.S. in Engineering Science

First Advisor

Arunachalam M. Rajendran

Second Advisor

Tyrus McCarty

Third Advisor

Prabhakar Mantena

Abstract

This thesis presents results from computational simulations of tungsten alloy segmented rod projectiles (SRP) penetrating an RHA semi-infinite target plate at high velocities. Penetration experimental data show improved penetration efficiency by the segmented projectiles when compared to monolithic (single solid rod) projectiles. For SRP with an aspect ratio (L/D) = 1/8, a loss in penetration efficiency was seen upon successive segment impacts. A numerical simulation impacting tungsten heavy alloy against RHA 4340 steel was performed using the Lagrangian finite element code EPIC 2006. The impact configuration that was modeled consisted of eight successive collinear impacts of discs measured 2mm in thickness and 16mm in diameter and travelling at 2.6km/sec. Normandia and Lee, using an Eulerian finite element code (AUTODYN), performed numerical simulations of the same configuration of the segmented rod penetration into RHA plates. Their results were compared and contrasted with those of EPIC 2006. Additionally the role of back-flowing ejecta was examined and found to perforate incoming segments. In an effort to increase penetration performance, an alternate SRP design was tested. This design implemented a hole in the center through which back-flowing ejecta would be allowed to flow unimpeded.

Concentration/Emphasis

Mechanical Engineering

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