RT info:eu-repo/semantics/article
T1 Methodology to predict mechanical properties of PA-12 lattice structures manufactured by powder bed fusion
A1 Rodríguez Aparicio, Rubén
A1 Alegre Calderón, Jesús Manuel
A1 Verbeeten, Wilco M.H.
A1 Lorenzo Bañuelos, Miriam
A1 Cuesta Segura, Isidoro Iván
K1 PA-12
K1 Selective Laser Sintering
K1 Microstructural defects
K1 Finite Element Analysis
K1 Lattice structure
K1 Ingeniería civil
K1 Civil engineering
K1 Materiales de construcción
K1 Building materials
AB 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.
PB Elsevier
SN 2214-8604
YR 2023
FD 2023-09
LK http://hdl.handle.net/10259/8184
UL http://hdl.handle.net/10259/8184
LA eng
NO 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.
DS Repositorio Institucional de la Universidad de Burgos
RD 09-may-2024