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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Numerical Modeling of Non-linear Thermal Stress in Direct Metal Laser Sintering Process of Titanium Alloy Products

DOI: 10.1615/TFESC1.iam.012685
pages 1519-1531

Xinran Zhao
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

Patcharapit Promoppatum
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

Shi-Chune Yao
Department of Mechanical Engineering, Institute for Complex Engineered Systems, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, USA


KEY WORDS: additive manufacturing, direct metal laser sintering, thermo-mechanical simulation, residual stress, finite element analysis.

Abstract

The heat transfer and residual stress evolution in direct metal laser sintering process of titanium alloy are studied. A numerical model is developed in COMSOL Multiphysics environment, with temperature-dependent material properties of TiAl6V4 considered. The existing theoretical models for both elastic and plastic problems are reviewed, and comparisons with the simulation results are made. The thermo-mechanical coupled simulation is performed. 3-D simulation is used to study single-layer laser sintering and the interaction between lateral lines. 2-D model is used to study the multi-layer effects. The results reveal the change of residual stresses and strains among the multiple layers with the change of local base temperature, laser power, support plate thickness, etc. Also, compared to elastic case, plastic results show lower residual stresses but higher strains, as well as plastic strain accumulation. The result of local laser sintering simulation provides a better understanding of the complex thermal mechanical mechanisms of laser sintering additive manufacturing processes.

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