Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/101269
Title: Numerical Analysis of Residual Stresses in Parts Produced by Selective Laser Melting Process
Authors: Marques, Bruno M. 
Andrade, Carlos M. 
Neto, Diogo M. 
Oliveira, Marta C. 
Alves, José L.
Menezes, Luís F. 
Keywords: Additive manufacturing; Selective laser melting; Thermo-mechanical modeling; Residual stresses
Issue Date: 2020
Project: CENTRO-01- 0145-FEDER-031657 under the project MATIS (CENTRO- 01-0145-FEDER-000014) 
info:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC/EME-EME/31657/2017/PT 
info:eu-repo/grantAgreement/EC/H2020/820776/EU/Intelligent data-driven pipeline for the manufacturing of certified metal parts through Direct Energy Deposition processes 
info:eu-repo/grantAgreement/AKA/null/201760/FI/Mathematics Teacher Learning in the Information Society (MATIS) 
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID/EMS/00285/2019/PT/Centre for Mechanical Engineering 
metadata.degois.publication.title: Procedia Manufacturing
metadata.degois.publication.volume: 47
Abstract: Additive manufacturing (AM) of metallic components has received large attention in the last decade, particularly the selective laser melting (SLM) process, due to its ability to produce complex and customized parts. However, the high residual stresses generated by the thermal cycles can lead to significant distortions and ultimately to the part cracking. Therefore, several numerical simulation tools have been adopted to predict and mitigate the unwanted part distortion. This study presents a thermo-mechanical model able to simulate the SLM process, considering multitrack within a single powder layer. The finite element model considers the powder-liquid-solid phase changes, i.e. includes melting, solidification and cooling phenomena. The thermal analysis is based on the transient heat conduction problem, considering a volumetric moving heat source. The mechanical analysis is based in an elastoplastic constitutive law, which predicts the residual stresses through the strains induced by the thermal gradients. Both the thermal and the mechanical material properties are assumed as temperature dependent. The main goal of this study is to assess the effect of the scan strategy on the residual stresses generated in the built component. In this context, unidirectional and alternating scan strategies are compared in terms of thermal history and consequent residual stresses generated.
URI: https://hdl.handle.net/10316/101269
ISSN: 23519789
DOI: 10.1016/j.promfg.2020.04.167
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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