Date of Award

3-26-2020

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Anthony N. Palazotto, PhD

Abstract

A high-speed projectile impact is a highly complex dynamic problem that can be simplified with the use of finite element analysis solvers. Abaqus/Explicit was used to evaluate the impact of various projectiles using a plane strain setup. Using a baseline stainless steel projectile, the proposed sandwich construction design was analyzed and compared to the baseline projectile. The overall goal was to see if a new composite casing could perform similarly to the simple baseline projectile. The sandwich construction used stainless steel, tungsten, and silicon-carbide reinforce aluminum as outer and inner shell materials. The core material was created using additive manufacturing of inconel 718. The inconel 718 core is a triply periodic minimal surface structure manufactured to provide the projectile casing with high stiffness and strength while reducing material used to manufacture it. A monolithic concrete target using a brittle cracking model for a projectile hitting a concrete wall in order to simulate a projectile impacting a bunker, road, or other concrete structure. Each projectile was evaluated using either the Johnson-Cook damage model or the Hashin damage model depending on if the shell materials were ductile metals or a metal matrix composite. By implementing the sandwich design, the negatives and benefits can be considered for mission feasibility.

AFIT Designator

AFIT-ENY-MS-20-M-255

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