Electrical and Computer Engineering ETDs

Publication Date

Summer 2023

Abstract

Stochastic flaw formation leading to poor print quality is a major obstacle to the utility of directed energy deposition (DED), a laser and metal powder-based additive manufacturing technology for construction and repair of custom metal parts. While melt pool temperature variability is known to be a major factor in flaw formation, control schemes to decrease flaw formation are limited by a lack of physics-based models that fully and accurately describe DED. In this work, a stochastic reachability analysis with a data-driven model based on thermal images of the melt pool was conducted to determine the likelihood of violating melt pool temperature constraints. As validation, the likelihood maps were compared to the true locations of porosities determined from CT scans of the parts. Additionally, a recurrent neural network (RNN) was trained to predict porosity locations using melt pool thermal images without prior assumptions as to the cause of the porosities.

Document Type

Thesis

Language

English

Degree Name

Electrical Engineering

Level of Degree

Masters

Department Name

Electrical and Computer Engineering

First Committee Member (Chair)

Meeko Oishi

Second Committee Member

Rafael Fierro

Third Committee Member

Claus Danielson

Fourth Committee Member

Ganesh Balakrishnan

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