Thermomechanical Modeling of Additive Manufacturing Large Parts
- 24 October 2014
- journal article
- Published by ASME International in Journal of Manufacturing Science and Engineering
- Vol. 136 (6), 061007
- https://doi.org/10.1115/1.4028669
Abstract
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%.Keywords
This publication has 32 references indexed in Scilit:
- Thermo-mechanical analysis of Wire and Arc Additive Layer Manufacturing process on large multi-layer partsComputational Materials Science, 2011
- Computational modelling of shaped metal depositionInternational Journal for Numerical Methods in Engineering, 2010
- Analytical and numerical modelling of the direct metal deposition laser processJournal of Physics D: Applied Physics, 2008
- Finite element modeling discretization requirements for the laser forming processInternational Journal of Mechanical Sciences, 2004
- FINITE ELEMENT MODELING AND SIMULATION OF WELDING. PART 3: EFFICIENCY AND INTEGRATIONJournal of Thermal Stresses, 2001
- FINITE ELEMENT MODELING AND SIMULATION OF WELDING PART 1: INCREASED COMPLEXITYJournal of Thermal Stresses, 2001
- Analysis and optimization of weakly coupled thermoelastoplastic systems with applications to weldment designInternational Journal for Numerical Methods in Engineering, 1995
- A simple error estimator and adaptive procedure for practical engineerng analysisInternational Journal for Numerical Methods in Engineering, 1987
- Numerical Analysis of Thermal Stresses During Welding Including Phase Transformation EffectsJournal of Pressure Vessel Technology, 1982
- Thermal Stresses in a Submerged-Arc Welded Joint Considering Phase TransformationsJournal of Engineering Materials and Technology, 1978