scholarly journals History Reduction by Lumping for Time-Efficient Simulation of Additive Manufacturing

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 58 ◽  
Author(s):  
Andreas Malmelöv ◽  
Andreas Lundbäck ◽  
Lars-Erik Lindgren
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Residual Stresses ◽  
Energy Deposition ◽  
Computation Time ◽  
Layer By Layer ◽  
Efficient Simulation ◽  
Computational Welding Mechanics ◽  
Directed Energy ◽  
Short Time

Additive manufacturing is the process by which material is added layer by layer. In most cases, many layers are added, and the passes are lengthy relative to their thicknesses and widths. This makes finite element simulations of the process computationally demanding owing to the short time steps and large number of elements. The classical lumping approach in computational welding mechanics, popular in the 80s, is therefore, of renewed interest and is evaluated in this work. The method of lumping means that welds are merged. This allows fewer time steps and a coarser mesh. It was found that the computation time can be reduced considerably, with retained accuracy for the resulting temperatures and deformations. The residual stresses become, to a certain degree, smaller. The simulations were validated against a directed energy deposition (DED) experiment with alloy 625.

scholarly journals A thermal-mechanical finite element workflow for directed energy deposition additive manufacturing process modeling

2018 ◽  
Vol 21 ◽  
pp. 556-566 ◽  
Author(s):  
Michael E. Stender ◽  
Lauren L. Beghini ◽  
Joshua D. Sugar ◽  
Michael G. Veilleux ◽  
Samuel R. Subia ◽  
...  
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Process Modeling ◽  
Manufacturing Process ◽  
Energy Deposition ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Substrate design to minimize residual stresses in Directed Energy Deposition AM processes

2021 ◽  
Vol 202 ◽  
pp. 109525
Author(s):  
Xufei Lu ◽  
Michele Chiumenti ◽  
Miguel Cervera ◽  
Junjie Li ◽  
Xin Lin ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Energy Deposition ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Am Processes

scholarly journals Influence of High-Productivity Process Parameters on the Surface Quality and Residual Stress State of AISI 316L Components Produced by Directed Energy Deposition

2021 ◽  
Author(s):  
Gabriele Piscopo ◽  
Alessandro Salmi ◽  
Eleonora Atzeni
Keyword(s):  
Surface Roughness ◽  
Residual Stresses ◽  
Surface Quality ◽  
Process Parameters ◽  
Energy Deposition ◽  
Industrial Applications ◽  
High Productivity ◽  
Directed Energy Deposition ◽  
Productivity Process ◽  
Directed Energy

AbstractThe production of large components is one of the most powerful applications of laser powder-directed energy deposition (LP-DED) processes. High productivity could be achieved, when focusing on industrial applications, by selecting the proper process parameters. However, it is of crucial importance to understand the strategies that are necessary to increase productivity while maintaining the overall part quality and minimizing the need for post-processing. In this paper, an analysis of the dimensional deviations, surface roughness and subsurface residual stresses of samples produced by LP-DED is described as a function of the applied energy input. The aim of this work is to analyze the effects of high-productivity process parameters on the surface quality and the mechanical characteristics of the samples. The obtained results show that the analyzed process parameters affect the dimensional deviations and the residual stresses, but have a very little influence on surface roughness, which is instead dominated by the presence of unmelted particles.

scholarly journals Directed energy deposition additive manufacturing of functionally graded Al-W composites

2021 ◽  
Vol 39 ◽  
pp. 101845
Author(s):  
J.P. Kelly ◽  
J.W. Elmer ◽  
F.J. Ryerson ◽  
J.R.I. Lee ◽  
J.J. Haslam
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Functionally Graded ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Working distance passive stability in laser directed energy deposition additive manufacturing

2019 ◽  
Vol 161 ◽  
pp. 86-94 ◽  
Author(s):  
James C. Haley ◽  
Baolong Zheng ◽  
Umberto Scipioni Bertoli ◽  
Alexander D. Dupuy ◽  
Julie M. Schoenung ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Passive Stability ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Working Distance
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