Abstract
In this study, a thermomechanical model is developed to predict the melt-pool dimensions and residual stresses for laser powder bed fusion process. Inherent strain method is also used to predict residual stresses by using only the thermal solution that is free the complexities involved with the mechanical solution. A unique approach is developed to define the surface heat losses as volumetric heat losses in order to avoid the definition of traction-free surfaces and their re-definition after layer deposition. The thermal process simulations predict melt-pool dimensions of experimental cross-sections of single tracks within approximately 10% agreement. The thermomechanical process model is used to forecast the effect of process parameters on the melt-pool dimensions and residual stresses. The inherent strain method reproduces the residual stresses within 15% accuracy, approximately six times faster in comparison to the thermomechanical model, and free of any convergence issues related with the displacement field solution.
| Original language | English |
|---|---|
| Article number | 102708 |
| Journal | Additive Manufacturing |
| Volume | 54 |
| Early online date | 4 Mar 2022 |
| DOIs | |
| Publication status | Published - 15 Mar 2022 |
Bibliographical note
Funding Information:We greatly acknowledge the scholarship awarded by Sabanci University - Faculty of Natural Sciences and Engineering , which is used to fund the graduate student (C.B.) to perform the research activities in this study. We thank M.Sc. Kerem Dortkasli at Sabanci University and Dr. Kemal Davut at Izmir Institute of Technology for the electron microscopy images.
Publisher Copyright:
© 2022 Elsevier B.V.