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.
- Hybrid additive manufacturing for tooling applications(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-08) Galván Camarena, Omar Karim; RODRIGUEZ GONZALEZ, CIRO ANGEL; 20794; Rodríguez González, Ciro Angel; puelquio, emipsanchez; Vázquez Lepe, Elisa Virginia; López Botello, Omar Eduardo; Escuela de Ingeniería y Ciencias; Campus MonterreyThe requirements for tooling manufacturing are dimensional accuracy, surface performance, hardness, wear resistance, fatigue strength, repairability and cost. In this research, a methodology for hybrid additive manufacturing, Direct Energy Deposition (DED) and milling process was tested on geometries and materials relevant to the tooling industry. The first stage consisted of the powder feeder characterization. Next, a full design of experiments evaluating laser power, feed, and mass flow with three levels each and their impact on height and width. The third stage was to evaluate the internal structure of single lines with three sets of parameters, evaluating height, width, melting pool height and porosity. Afterwards, five different layer thicknesses were tested on thin walls of six layers each. The results show the effect of layer thickness on the height of the wall, melting pool height and wall’s porosity. Finally, two different scanning strategies were tested to evaluate cubic geometries. The scanning strategies were zigzag 90° and zigzag 360°. Cubic geometries created on DED were machined to create truncated pyramids with a 3° angle by milling. Three different feed per tooth were tested each 2.5 mm of the truncated to evaluate the surface roughness. Results showed a parabolic behavior and the best value for average surface roughness near 0.4 micrometers. After the analysis, the hardness of the samples was characterized by a hardness test. The results showed an average hardness between 30 and 50 HRC which is between the operational hardness values for the tooling industry.
- Desing and additive manufacturing of a transtibial prosthesis socket via powder bed fusion(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-08) González Gallegos, Cynthia Pamela; Rodríguez González, Ciro Angel; tolmquevedo; García López, Erika; Segura Ibarra, Víctor; Escuela de Ingeniería y Ciencias; Campus Monterrey; Vázquez Lepe, Elisa VirginiaThis Thesis Project develops the Design and Additive Manufacturing of a transtibial socket made by powder bed fusion. The use of digital three-dimensional technologies is registered in the entire research, the stump modifications of sensitive and pressure areas are registered in the manner that the advantages of the PTB (Patellar Tendon Bearing) and TSB (Total Surface Bearing) socket types are merged to take advantages of their better features. Finally, the proposal of a Protocol that evaluates the prosthesis assembly in a biomechanical and emotional response is proposed to improve the socket adjustement.