Theses and Dissertations

ORCID

https://orcid.org/0000-0002-5116-9397

Advisor

Priddy, Matthew W.

Committee Member

Priddy, Lauren B.

Committee Member

Hammi, Youssef

Date of Degree

8-13-2024

Original embargo terms

Visible MSU Only 1 year

Document Type

Graduate Thesis - Campus Access Only

Major

Mechanical Engineering

Degree Name

Master of Science (M.S.)

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

Finite element modeling (FEM) is used to predict complex phenomena like part deformation and the formation of residual strain resulting from cyclical heating. A gap exists in current literature using FEM to investigate the effect of printing strategies on strain and deformation in Ti-6Al-4V NIST bridges built by laser powder bed fusion (L-PBF). This study compares thermomechanical finite element models incorporating three scan strategies commonly used in literature: meander, stripe, and checkerboard, for the fabrication of Ti-6Al-4V NIST bridges using L-PBF. FEM of each scan strategy uses four mechanical material models: elastic perfectly plastic, Johnson-Cook, eigenstrain, and Hill 1948. The models’ mechanical responses are compared to experimental data. The objective of this work is to compare the predicted strain states, part deflections, and runtimes for each scan strategy and mechanical material model. Ultimately, this work aims to use FEM to predict challenges from the as-printed stress state of the L-PBF part.

Download

Share

COinS