2026-04-21T06:46:47Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/81842023-12-06T01:05:19Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

Rodríguez Aparicio, Rubén Alegre Calderón, Jesús Manuel Verbeeten, Wilco M.H. Lorenzo Bañuelos, Miriam Cuesta Segura, Isidoro Iván 2023-12-05T11:44:27Z 2023-12-05T11:44:27Z 2023-09 2214-8604 http://hdl.handle.net/10259/8184 10.1016/j.addma.2023.103864 Topology optimization for weight reduction of additive manufacturing parts is commonly achieved throughout the creation of lattice structures, typically generated with beams of small size cross-section. In order to carry out accurate simulations of these lattice structures, knowing the mechanical behavior of pillars is required. In this paper, a methodology for determining the mechanical properties of small size pillars printed in PA-12 material, using polymer powder bed fusion (PBF) and in particular the Selective Laser Sintering (SLS) technology, is presented. The effect of defects originated during the manufacturing process on the macroscopic mechanical properties is studied and the mechanisms which influence these properties are analyzed. A methodology for the determination of these properties is proposed, based on a successive correction of the printed nominal diameters according to two approaches; one due to the outer skin of unmelted material and the other due to internal melting defects. Once the material properties are determined, as a function of the cross-section of the lattice pillars, the numerical simulation of lattice-type structures has been carried out and the degree of adjustment of the proposed methodology has been experimentally verified, obtaining good results. This validation provides a reliable method for the simulation of the macroscopic behavior of lattice-type structures with reduced sizes, taking into account the intrinsic defects generated during the printing process. The authors wish to acknowledge the funding received through the Junta de Castilla y León projects BU-002-P20 and INVESTUN/22/BU/0003 co-financed with FEDER funds, and the projects MR5W.P3 (C17. I01. P01. S21) and MR4W.P2 co-financed by JCyL and MICINN and the NextGenerationEU/PRTR funds. application/pdf eng Elsevier Additive Manufacturing. 2023, V. 78, 103864 https://doi.org/10.1016/j.addma.2023.103864 info:eu-repo/grantAgreement/Junta de Castilla y León//BU-002-P20//Optimización de las técnicas de post-procesado para la mejora de propiedades mecánicas y de fatiga en componentes realizados mediante fabricación aditiva/ info:eu-repo/grantAgreement/Junta de Castilla y León//INVESTUN%2F22%2FBU%2F0003//Prevención de Riesgos Laborales en la Instalación Vertical de Mangueras para el Cuerpo de Bomberos de Burgos/ info:eu-repo/grantAgreement/Junta de Castilla y León//MR5WP3//Planes complementarios de I+D+i, Tecnologías, materiales y procesos para producción a pequeña escala de portadores de Hidrógeno Renovable (Metano y Amoniaco) para aprovechamiento distribuido en CyL/ info:eu-repo/grantAgreement/Junta de Castilla y León//MR4WP2//Plan Complementario de Materiales Avanzados: subproyecto GIE/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess PA-12 Selective Laser Sintering Microstructural defects Finite Element Analysis Lattice structure Ingeniería civil Materiales de construcción Civil engineering Building materials Methodology to predict mechanical properties of PA-12 lattice structures manufactured by powder bed fusion info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Additive Manufacturing 78 103864