Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Whittington, Wilburn

Committee Member

Yarahmadian, Shantia

Committee Member

Rhee, Hongjoo

Committee Member

El Kadiri, Haitham

Committee Member

Subhash, Ghatu

Date of Degree

4-30-2021

Original embargo terms

Visible to MSU only for 1 year

Document Type

Dissertation - Campus Access Only

Major

Engineering

Degree Name

Doctor of Philosophy

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

This work analyzes the design and implementation of waveguides used to measure stress waves in solid mechanics via explicit finite element analysis and experimentation. Many areas of physics use waveguides where control of timing, location, or frequency of waves is imperative to functionality of a system. Split Hopkinson pressure bars (Kolsky bars) traditionally utilize straight waveguides during testing. Prior research produced the first bent wave guide for use in such an application, the coaxially embedded serpentine bar (CESB). Explicit finite element analysis (FEA) provides a modeling approach to understand the effects of pass and joint geometry and boundary conditions on the functionality of solid-mechanic waveguides like the CESB. FEA and experimentation also contrasts the functionality of welded joints and threaded joints. Novel waveguide designs that do not feature tubes are also detailed for use in dynamic mechanical testing and dynamic hardness indentation experiments. These designs feature acoustic lengths up to two orders of magnitude greater than their physical lengths.

Sponsorship

Army Research Lab

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