Publication Date
2009
Document Type
Thesis
Committee Members
Srikanth Bontha (Committee Member), Nathan Klingbeil (Advisor), Raghavan Srinivasan (Committee Member)
Degree Name
Master of Science in Engineering (MSEgr)
Abstract
With the advent of Rapid Protyping (RP) in the manufacturing industry, many newtechnologies came into development for quick fabrication of materials. One of the most versatile fabrication process among them is additive manufacturing. Laser based manufacturing (LBM) and electron beam manufacturing (EBM) processes use the energy from a laser or electron beam to build up structures layer by layer directly from powdered metals and wire feed stock. It has been determined from previous work that solidification cooling rate and thermal gradients are the important factors for controlling microstructure (grain size and morphology) and resulting mechanical properties of the deposit. The previous work was concerned with semi-infinite thin wall and bulky 3-D geometries where the thermal solution near the laser or electron beam is independent of the boundaries. The goal of the current study is to investigate the effects of finite geometry (finite length and height of the build) and associated non-steady state changes in process variables (beam power and velocity) on the thermal conditions controlling microstructure through parametric finite element modeling with ABAQUS. The results of this project will guide process designers in the additive manufacture of a variety of common thin walled geometries.
Page Count
93
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
2009
Copyright
Copyright 2009, all rights reserved. This open access ETD is published by Wright State University and OhioLINK.
