Electronic Theses and Dissertations

Identifier

6668

Date

2020

Document Type

Thesis

Degree Name

Master of Science

Major

Mechanical Engineering

Committee Chair

Ebrahim Asadi

Committee Member

Gladius Lewis

Committee Member

Gary Bowlin

Committee Member

Amir Hadadzadeh

Abstract

Additively manufactured Ti-6Al-4V cellular structures are the most popular metallic choices for bonetissue engineering (BTE) applications. In this work, laser-based powder bed fusion (PBF) technologywas employed to fabricate Ti-6Al-4V cellular structures with geometries mimicking human cancellousbone properties. This study introduces novel laser scanning strategies with their associated laserbased PBF processing parameters for the fabrication of fine resolution Ti-6Al-4V cellular structureswith tailored mechanical properties to improve their mechanical performance. Two distinct designedgeometries, diamond and dodecahedron, in four different pore sizes were manufactured byemploying three different laser-based PBF scanning strategies in combination with various laserpower and scanning speeds while the laser spot size (~80μm), average powder size (34μm), andlayer thickness (30μm) remained unchanged throughout the study. The observed finest resolution ofstruts for the manufactured cellular structures was 120μm. Later, correlations between laser-basedPBF processing parameters/scanning strategies and physical/mechanical properties wereinvestigated in this study. The properties of several fabricated dodecahedron structuresdemonstrated the ability to mimic human cancellous bone properties by exhibiting compressivestrength, modulus of elasticity, and porosity in the range of 0.1-30MPa, 0.01-3GPa, and 72.6-87.4%,respectively. The concluding remarks on conceivable propriety for BTE applications incorporated thesets of scanning strategies and particular unit cell sizes of dodecahedron cellular structure.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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