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Simulating Geometric and Thermal Aspects of Powder-Jet Laser Additive Manufacturing

[+] Author Affiliations
Andrew Birnbaum

Leidos, Inc., Washington, DC

John G. Michopoulos, Athanasios P. Iliopoulos

Naval Research Laboratory, Washington, DC

Paper No. DETC2016-59644, pp. V01AT02A034; 8 pages
doi:10.1115/DETC2016-59644
From:
  • ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1A: 36th Computers and Information in Engineering Conference
  • Charlotte, North Carolina, USA, August 21–24, 2016
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5007-7
  • Copyright © 2016 by ASME

abstract

In order to predict the effects of energy and material deposition via laser and powder-jet based additive manufacturing methods, it is necessary to model a number of appropriate key process phenomena. In addition to solving the classical transient heat equation subject to a moving heat source, it is also critical that local, transient changes in domain geometry and properties also be addressed in order to approach as-build geometry and its associated functional behavior. Furthermore, the melting/solidification behavior of the deposited material may also need to be addressed due to its implications to local temperature-time histories. Finally, incorporating process parameters into a comprehensive simulation is also essential in providing accurate, high fidelity predictions. This work presents efforts at incorporating all of the above-mentioned phenomena via a finite element-based simulation framework to lay the groundwork for full-scale, fully coupled simulations of entire parts. A comparison of predictions including and omitting phase transformation effects along with mass conservation is also presented in the context of assessing the accuracy gained versus the requisite computational expense.

Copyright © 2016 by ASME

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