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Residual Stress Predictions in L-PBF Ti-6Al-4V NIST Bridges Using FEM
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Residual Stress Predictions in L-PBF Ti-6Al-4V NIST Bridges Using FEM
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Dissertation
Residual Stress Predictions in L-PBF Ti-6Al-4V NIST Bridges Using FEM
2024
Overview
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.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9798383702666
