Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Characterization of additively manufactured SS316L lattice geometries for lumbar interbody fusion cage application(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-08) Fraga Martínez, Antonio Abraham; Rodríguez González, Ciro Angel; qro /|bqrotbecerra/tolmquevedo; García López, Erika; López Botello, Omar Eduardo; Escuela de Ingeniería y Ciencias; Campus MonterreyThe Additive Manufacturing provides the capability of fabricate solid and hollow structures. Selective Laser Melting, an additive manufacturing technique, uses a powder bed and a laser melts the powder according to a trajectory needed to generate a 2D layer, then another layer of powder is distributed, and this layer is melted. This process is repeated, and the result is a 3D piece made of 2D layers. Hollow structures can be created reducing the material volume fraction and allowing to have desired mechanical properties for a specific behavior of a piece. For orthopedic implants, hollow pieces allow matching the mechanical properties of the implant to the ones of the surrounding tissue where it is pretended to be placed. Lattice structure are a kind of hollow structures used in many fields, including the health one. In this work, lattice structure cylinders with three different lattice structure (Body centered cubic, Body centered hexagonal and Tetrahedron) of two different unit cell sizes (3x3x3 and 6x6xx mm) with a strut diameter set as 800 µm were fabricated in SS316L using SLM technique and submitted to compression test to be characterized mechanically in order to know their mechanical behavior. Considering the Young’s modulus of the different arrangements, the Tetrahedron lattice structure with a unit cell size of 3x3x3 mm and the same strut diameter was selected to create a lumbar interbody fusion cage, and another unit cell size of 4x4x4 mm was proposed to study with this same geometry. These lumbar cages achieved a Young’s modulus near to the vertebrae cortical and trabecular bone, allowing the correct transmission of loads. For future work, it is proposed to replicate these experiments with Nitinol powder, a biocompatible and biomechanically compatible alloy.
- Optimization of Dimensional Variation for Additive Manufacturing Using Response Surface Methodology Technique for Lattices Structure(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-02) Betancourt Chacón, Diego Antonio; Sandoval Robles, Jesús Alejandro; puelquio/tolmquevedo; Hernández Luna, Alberto Abelardo; Rodríguez González, Ciro Angel; School of Engineering and Sciences; Campus Monterrey; Vázquez Lepe, Elisa VirginiaIn this work, metal powder bed fusion selective laser fusion (SLM) process was used for the fabrication of 3 different lattices structures because of its high resolution for complex geometries, there are plenty of research works in the parameter optimization for solid pieces, however, there is a lack of research for pieces with porosity and a micrometric scale where most of the measurements are not reported. To achieve this, different lattice geometries such as cubic, diamond and fluorite were manufactured, these were produced with different parameters, mainly varying the laser power, the scanning speed or exposure time, and scanning strategy using Surface Response Methodology to optimize the results. The struts from each lattice were measured in the Z and X axis, as well as the porosity of each piece. Additionally, compression test was performed to obtain the stress from the diamond a flourite lattice structure. The results are the parameters to manufacture pieces in micrometric scale for Renishaw AM400 with Stainless Steel 316L with a reduced dimensional difference from the CAD.
- Evaluation of the dimensional capabilities for the technologies of selective laser melting and digital light processing, to fabricate microcavities: microneedle insert as case of study.(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-06-16) Meneses Ricaurte, Cindy Paola; Vázquez Lepe, Elisa Virginia; emipsanchez/tolmquevedo; Sandoval Robles, Jesús Alejandro; Rodríguez González, Ciro Ángel; School of Engineering and Sciences; Campus Monterrey; García López, ErikaAdditive manufacturing technologies are nowadays a feasible resource in micro parts fabrication, which have a wide range of applications from medical industry to injection molding. These technologies allow fabrication of complex parts with a variety of geometries and sizes that ultimately gives a competitive advantage by letting the manufacturing of insert molds. This research study the dimensional capabilities of selective laser melting and digital light processing to produce microneedle cavities from 500 μm to 2500 μm. An insert for microneedle was manufactured variating its bases geometries and successfully fabricated through selective laser melting at 0°, 45° and 90° orientations. Similarly, for the digital light processing technology, inserts for microneedle geometries were manufactured at 0° and 45° build surface orientation. It was found for the hexagonal base geometry, the best for both technologies with the lower dimensional errors, due to a common factor between processes called stair steeping. By using a reduction in border and contour power, height dimensional accuracy of the microneedle insert was improved. There was a minimum error of 3% for 600 μm of nominal height corresponding to the fabricated insert by selective laser melting at 0°orientation of construction with the optimal design.