Person: Calderón Uriszar-Aldaca, Íñigo
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Calderón Uriszar-Aldaca
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Íñigo
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Ingeniería
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0000-0002-6911-161X
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811725
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Publication Open Access Parametric modelling of 3D printed concrete segmented beams with rebars under bending moments(Elsevier, 2023) Aramburu, Amaia; Calderón Uriszar-Aldaca, Íñigo; Puente, I.; Ingeniería; Ingeniaritza3D concrete printing is gaining relevance as a technology for the manufacture of lightweight components and complex freeform shells. Nevertheless, the insertion of reinforcing elements to withstand tensile stress, the fabrication of large structures, and the insertion of joints between different segments are some targets that are still to be addressed for its full development. A new method which also includes a novel parametric model is presented in this study to simulate the performance of 3DPC reinforced segmented beams subjected to 3-point bending tests. In addition to the geometry of the complete beam, the beam segments, different materials, and the rebar, which were considered in previous works, the material age and the interface between segments and rebar-concrete adhesion are also considered in the new method. The method is complemented by a new set of programmed routines that connect commercial design and finite element calculation programs, requiring only one user interaction with an initial routine to generate the estimated performance of a component in a 3-point flexural test in a given set of cases. Finally, the method was validated through direct comparisons with experimental tests.Publication Open Access Size effects in finite element modelling of 3D printed bone scaffolds using hydroxyapatite PEOT/PBT composites(MDPI, 2021) Calderón Uriszar-Aldaca, Íñigo; Pérez, Sergio; Sinha, Ravi; Cámara Torres, María; Villanueva, Sara; Mota, Carlos; Patelli, Alessandro; Matanza, Amaia; Moroni, Lorenzo; Sánchez, Alberto; Ingeniería; IngeniaritzaAdditive manufacturing (AM) of scaffolds enables the fabrication of customized patient-specific implants for tissue regeneration. Scaffold customization does not involve only the mac-roscale shape of the final implant, but also their microscopic pore geometry and material properties, which are dependent on optimizable topology. A good match between the experimental data of AM scaffolds and the models is obtained when there is just a few millimetres at least in one direction. Here, we describe a methodology to perform finite element modelling on AM scaffolds for bone tissue regeneration with clinically relevant dimensions (i.e., volume > 1 cm3). The simulation used an equivalent cubic eight node finite elements mesh, and the materials properties were derived both empirically and numerically, from bulk material direct testing and simulated tests on scaffolds. The experimental validation was performed using poly(ethylene oxide terephthalate)-poly(butylene ter-ephthalate) (PEOT/PBT) copolymers and 45 wt% nano hydroxyapatite fillers composites. By applying this methodology on three separate scaffold architectures with volumes larger than 1 cm3, the simulations overestimated the scaffold performance, resulting in 150–290% stiffer than average values obtained in the validation tests. The results mismatch highlighted the relevance of the lack of printing accuracy that is characteristic of the additive manufacturing process. Accordingly, a sensi-tivity analysis was performed on nine detected uncertainty sources, studying their influence. After the definition of acceptable execution tolerances and reliability levels, a design factor was defined to calibrate the methodology under expectable and conservative scenarios.