Examinando por Autor "Barea, Rafael"

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  • Miniatura
    Ítem
    A geometrical robust design using the Taguchi method: application to a fatigue analysis of a right angle bracket
    (Universidad Nacional de Colombia, Facultad de Minas, 2018-06) Barea, Rafael; Novoa, Simón; Herrera, Francisco; Achiaga, Beatriz; Candela, Nuria
    The majority of components used in aeronautic, automotive or transport industries are subjected to fatigue loads. Those elements should be designed considering the fatigue life. In this paper the geometrical design of a right angle bracket has been simulated byFEM, considering the type of material, the applied load and the geometry of the pieces. The geometry of the right angle bracket has been optimized using the Taguchi’s robust optimization method. As far as the authors know, there are no publications dealing with the use ofthe Taguchi’s robust optimization method applied to the geometric design of industrial pieces having as output variable the Findley fatigue coefficient. This paper presents a method for determining the critical design parameters to extend the product life of components subject to fatigue loading. This pioneer idea is applicable to any other design or physical or mechanical application so it can be widely used as new methodology to fatigue robust design of mechanical parts and components
  • Miniatura
    Ítem
    Process parameter optimization for enhanced mechanical performance in PBF-LB/M of AISI 316L using constant energy density
    (Springer Science and Business Media Deutschland GmbH, 2026-06-29) Achiaga, Beatriz ; Castaño, Blanca; Gómez Lendinez, Daniel; Barea, Rafael ; Pedrolli, Lorenzo; López García, Alejandro
    Laser powder bed fusion (PBF-LB/M) is an additive manufacturing technology (AM) for producing metal components with complex geometries. The mechanical properties of these components play an important role in their performance and functionality. This work has found the process parameters to achieve the optimal properties of AISI 316L stainless steel using SamyLabs Alba 300 system. A Design of Experiments approach was employed under a constant volumetric energy density constraint to identify optimal parameter combinations (laser power, laser frequency, scanning speed and hatching distance). Tensile testing and metallographic analysis show that even at fixed energy input, the material’s properties were still affected by the process parameters. Specifically, higher laser frequencies and reduced scanning speeds, combined with increased hatching distances, led to improved mechanical performance with a significant positive impact on tensile strength and hardness of the manufactured parts. The results demonstrate that laser frequency plays a critical role in melt pool dynamics. Optimal settings derived from this study provide a reliable guideline for enhancing part quality in PBF-LB/M processes and can be extrapolated to similar AM systems.