Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Modeling of the Directed Energy Deposition (DED) process to obtain residual stress states of simplified tracks
Submission Author:
Felipe Carneiro , SP
Co-Authors:
Felipe Carneiro, Guilherme Fernandes Guimarães, Charles Luís da Silva, Ronnie Rego, Alfredo Faria
Presenter: Felipe Carneiro
doi://10.26678/ABCM.COBEM2023.COB2023-0197
Abstract
Direct energy deposition (DED) is an additive manufacturing process that utilizes a concentrated energy source to melt material while simultaneously depositing it through a nozzle. In this scenario, the surface integrity state plays a key role in determining the mechanical behavior of the part. Thus, the present study developed a DED model process using the finite element method to address the residual stress state in the substrate induced by the additive process. The model was developed through Simufact Welding software. Heat source, boundary conditions, sample geometry, meshing and trajectory were modeled to obtain a simulation setup. Specimens’ profiles were measured to understand the effects of parametrization. Experimental evaluation was conducted by comparing the residual stresses numerically obtained against single-tracks DED samples. Model and samples showed a common behavior, which was tensile residual stress over the deposition area, whereas compressive stresses are present at the edges of the substrate. Assessment of the residual stress state showed that the combination of parameters associated with higher linear energy density leads to greater tensile stress. Thus, the DED simulation model was developed, and its results were consistent with experimental assessed values, providing the required validation for further implementation of it.
Keywords
Laser direct energy deposition, Finite Element Method, Residual stresses
