A finite element modeling strategy is developed to allow for the prediction of distortion accumulation in additive manufacturing (AM) large parts (on the order of meters). A 3D thermoelastoplastic analysis is performed using a hybrid quiet inactive element activation strategy combined with adaptive coarsening. At the beginning for the simulation, before material deposition commences, elements corresponding to deposition material are removed from the analysis, then elements are introduced in the model layer by layer in a quiet state with material properties rendering them irrelevant. As the moving energy source is applied on the part, elements are switched to active by restoring the actual material properties when the energy source is applied on them. A layer by layer coarsening strategy merging elements in lower layers of the build is also implemented such that while elements are added on the top of build, elements are merged below maintaining a low number of degrees of freedom in the model for the entire simulation. The effectiveness of the modeling strategy is demonstrated and experimentally validated on a large electron beam deposited Ti–6Al–4V part consisting of 107 deposition layers. The simulation and experiment show good agreement with a maximum error of 29%.
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December 2014
Research-Article
Thermomechanical Modeling of Additive Manufacturing Large Parts
Erik R. Denlinger,
Erik R. Denlinger
1
Department of Mechanical and
Nuclear Engineering,
e-mail: erd5061@psu.edu
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
e-mail: erd5061@psu.edu
1Corresponding author.
Search for other works by this author on:
Jeff Irwin,
Jeff Irwin
Department of Mechanical and
Nuclear Engineering,
e-mail: jei5028@psu.edu
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
e-mail: jei5028@psu.edu
Search for other works by this author on:
Pan Michaleris
Pan Michaleris
Associate Professor
Department of Mechanical and
Nuclear Engineering,
Department of Mechanical and
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
Search for other works by this author on:
Erik R. Denlinger
Department of Mechanical and
Nuclear Engineering,
e-mail: erd5061@psu.edu
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
e-mail: erd5061@psu.edu
Jeff Irwin
Department of Mechanical and
Nuclear Engineering,
e-mail: jei5028@psu.edu
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
e-mail: jei5028@psu.edu
Pan Michaleris
Associate Professor
Department of Mechanical and
Nuclear Engineering,
Department of Mechanical and
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
1Corresponding author.
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received April 14, 2014; final manuscript received September 19, 2014; published online October 24, 2014. Assoc. Editor: David L. Bourell.
J. Manuf. Sci. Eng. Dec 2014, 136(6): 061007 (8 pages)
Published Online: October 24, 2014
Article history
Received:
April 14, 2014
Revision Received:
September 19, 2014
Citation
Denlinger, E. R., Irwin, J., and Michaleris, P. (October 24, 2014). "Thermomechanical Modeling of Additive Manufacturing Large Parts." ASME. J. Manuf. Sci. Eng. December 2014; 136(6): 061007. https://doi.org/10.1115/1.4028669
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