Theses and Dissertations

Date of Award

12-2022

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Manufacturing Engineering

First Advisor

Dr. Farid Ahmed

Second Advisor

Dr. Ehsan Marzbanrad

Third Advisor

Dr. Jianzhi Li

Abstract

Many manufacturing industries utilize powder bed fusion (PBF) since it can produce microscale precision 3D parts. During PBF, powder particles are selectively fused layer by layer using thermal energy. The build quality in the PBF process relies heavily on powder bed properties and thermal energy deposition. Powder flowability, spreadability, and packing fraction are some of the insightful factors that determine the quality of the powder bed. In this study, a two-dimensional powder bed is developed using the LAMMPS package. A cloud-based pouring of powders with varying volumes and initialization is adopted for the work. A blade-type and circular recoater is used to spread powders in the bed. The simulation results calculate the Angle of Repose (AOR) to find the flowability. Packing fraction is observed for the bimodal and polydisperse systems. Some form of agglomeration is also observed in the end result, which can be found in a polymer and metal system or ceramic and metal mixture. Powder segregation is observed for the bimodal and polydisperse systems. Powder segregation occurs less when a higher percentage of big particles and a polydisperse mixture are present in the bed. The present study focuses on the 2D system of spherical particles, which can be adapted to the study of the powder bed with non-spherical particles.

Comments

Copyright 2022 Yeasir Mohammad Akib. All Rights Reserved.

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