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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- Validation of the process parameter for enhancing densification and thermal conductivity of the IN718 superalloy manufactured by selective laser melting(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2023-06-16) Rosete Taboada, Diana Ximena; Elías Zúñiga, Alex; puemcuervo, emimayorquin; Olvera Trejo, Daniel; School of Engineering and Sciences; Campus Monterrey; Martínez Romero, OscarThis thesis proposal aims to investigate the enhancement of thermal and physical properties in Selective Laser Melting (SLM) metallic components, focusing on the improvement of the processing parameters. The research is conducted as part of the master’s degree program in Science in Manufacturing Systems. Additively manufactured metal-based samples face challenges related to microstructural changes and defects impacting their properties. The proposed study addresses these issues by exploring two key factors: the metal powder used and processing parameters. Specifically, the research aims to determine the impact of the processing parameter modification on the mechanical, physical, and thermal properties of additively manufactured metal-based samples using Inconel 718 powder. The goal is to determine the adequate processing parameters, that result in an enhancement in the densification, and thermal conductivity of the IN718 AM samples, aligning with the desired properties outlined in the scientific literature
- Development of a piezoelectric smart device with fiber meshes elaborated by Forcespinning™(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-06-14) Aguirre Corona, Renato Wenceslao; ELIAS ZUÑIGA, ALEX; 2019150; Elías Zúñiga, Alex; puelquio, emipsanchez; Olvera Trejo, Daniel; Martínez Romero, Oscar; Escuela de Ingeniería y Ciencias; Campus Monterrey; Del Ángel Sánchez, KarinaA novel approach was used in this thesis project. BaTiO3 nanoparticles named as BTO nanoparticles were synthesized in the laboratory and commercial graphene named as G are used as fillers in Polyvinylidene Fluoride named as PVDF for the formation of polymeric meshes for the development of piezoelectric devices. Piezoelectric fiber meshes from different materials as: PVDF, BTO/PVDF, G/PVDF, BTO/G/PVDF are done varying the concentration of the fillers to evaluate the materials. The fiber meshes were fabricated in the Forcespinning™ technique and were characterized using different techniques. Scanning Electron Microscopy was used to obtain the morphology and chemical composition by Energy Dispersive Spectroscopy(EDS), Fourier Transformed Infrared Spectroscopy (FTIR) was done for the identification of the phase composition of the material, Thermogravimetric Analysis allows the obtention of the maximum temperature of degradation to identify the materials with more thermal stability and X-ray Diffraction confirmed us the presence of the planes of the β phase in the fiber meshes and in the BTO the planes that are in concordance to the crystallographic card 96-150-7758. For the characterization of the piezoelectric devices an Impact tester was used with a multimeter to record the voltage generated by all the samples. Where the mean maximum voltage generated for the A2 device is 35.77 Voc, the best device with only BTO as filler, while A3, A4, A6 and A7 samples are samples where G is used with a bad performance. The devices developed can be used for different applications as sensors or nanogenerators, showing a promising performance. Piezoelectric devices are of interest by the generation of voltage from sources that were not used before, therefore producing energy from sustainable alternatives, offering an option for remote self-powered sensors.
- Development of a piezoelectric smart device with fiber meshes elaborated by Forcespinning™(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-06-14) Aguirre Corona, Renato Wenceslao; ELIAS ZUÑIGA, ALEX; 19150; Elías Zúñiga, Alex; tolmquevedo/mscuervo; Rodríguez Salinas, Juan José; Martínez Romero, Oscar; Olvera Trejo, Daniel; Escuela de Ingeniería y Ciencias; Campus Monterrey; Del Ángel Sánchez, KarinaA novel approach was used in this thesis project. BaTiO3 nanoparticles named as BTO nanoparticles were synthesized in the laboratory and commercial graphene named as G are used as fillers in Polyvinylidene Fluoride named as PVDF for the formation of polymeric meshes for the development of piezoelectric devices. Piezoelectric fiber meshes from different materials as: PVDF, BTO/PVDF, G/PVDF, BTO/G/PVDF are done varying the concentration of the fillers to evaluate the materials. The fiber meshes were fabricated in the Forcespinning™ technique and were characterized using different techniques. Scanning Electron Microscopy was used to obtain the morphology and chemical composition by Energy Dispersive Spectroscopy(EDS), Fourier Transformed Infrared Spectroscopy (FTIR) was done for the identification of the phase composition of the material, Thermogravimetric Analysis allows the obtention of the maximum temperature of degradation to identify the materials with more thermal stability and X-ray Diffraction confirmed us the presence of the planes of the β phase in the fiber meshes and in the BTO the planes that are in concordance to the crystallographic card 96-150-7758. For the characterization of the piezoelectric devices an Impact tester was used with a multimeter to record the voltage generated by all the samples. Where the mean maximum voltage generated for the A2 device is 35.77 Voc, the best device with only BTO as filler, while A3, A4, A6 and A7 samples are samples where G is used with a bad performance. The devices developed can be used for different applications as sensors or nanogenerators, showing a promising performance. Piezoelectric devices are of interest by the generation of voltage from sources that were not used before, therefore producing energy from sustainable alternatives, offering an option for remote self-powered sensors.
- Carbon fiber polymer composites: a preliminary study on their morphological and mechanical properties.(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022) Trapero Mascareño, Alexis; ELIAS ZUÑIGA, ALEX; 19150; Elías Zúñiga, Alex; emipsanchez; Ramírez Herrera, Claudia Angélica; Martínez Romero, Oscar; Olvera Trejo, Daniel; School of Engineering and Sciences; Campus Monterrey; Cruz Cruz, IsidroWith the increasing demand for air travel and population growth, aircraft efficiency is a top priority to decrease costs and environmental damage. The use of composite materials for modern aircraft construction has been growing rapidly in recent years. The area of opportunity to improve these materials and create more knowledge to get all the benefits they can provide is huge. In this work, further development of a previously proposed material is done. Different variants of Carbon Fiber Reinforced Composites (CFRP) composites are proposed and characterized in order to improve their mechanical properties. The polymer used in this work, a commercially available epoxy resin, is analyzed using differential scanning calorimetry (DSC) to find adequate processing parameters for a faster curing process than that suggested by the resin provider. The composite's tensile properties are improved compared to previous studies performed in the research group, but the CF fabric architecture seems to not affect the properties. Impregnation of the fibers is improved with different CF fabric architectures, and the resulting composite is more resistant in tensile tests than some conventional metallic aerospace components. Further investigation is needed to get insights into the polymer's compatibility with the CF. Further testing of the material and other variants is important to understand which parameters work best for the intended applications.
- Mathematical modeling of ultrasonic micro injection molding using dimensional analysis for manufacturing polymeric parts(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-11-23) Salazar Meza, Marco; Elías Zúñiga, Alex; hermlugo/tolmquevedo; Olvera Trejo, Daniel; Escuela de Ingeniería y Ciencias; Campus Monterrey; Martínez Romero, OscarUltrasonic micro injection molding is a novel processing method to produce micro-scaled specimens at low production volumes that overcomes the material degradation originated by high residence times, and reduces material waste compared to conventional injection molding. Ultrasonic micro injection molding deals with ultrasonic energy and polymers under cyclic loads which experience a phase-change from solid to a non-Newtonian fluid flowing to fill a mold. Attempts have been made to study each of the steps of the process, all of them needing powerful FEM software and the establishment of several assumptions to simplify the calculus on the otherwise thermomechanical coupled problem with different time scales. This research work presents a methodology to reduce the mathematical complexity of the process while preserving the physics of the system through the usage of dimensional analysis. A correct relationship of processing parameters and energy consumption values was obtained using four different polypropylenes with distinct mechanical properties, all of them fitting adequately in the proposed formulation composed of dimensionless groups obtained through the Buckingham-Pi Theorem. A mathematical expression capable of quantitatively predict energy consumption from processing parameters was obtained. Additionally, a relationship between the processing parameters and the Young’s Modulus of the produced specimens was found, and a mathematical expression to calculate this property using processing parameters was stablished.
- Dimensional analysis for tuning Selective Laser Melting parameters for near-full density of Inconel 718(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-06) Estrada Díaz, Jorge Alfredo; ELIAS ZUÑIGA, ALEX; 19150; Elías Zúñiga, Alex; ilquio, emipsanchez; Martínez Romero, Oscar; Olvera Trejo, Daniel; School of Engineering and Sciences; Campus Monterrey; Rodríguez Salinas, Juan JoséSelective laser melting is a powder bed fusion process that allows the production of metallic pieces of high geometrical complexity. Full densification is regarded as fundamental to achieve mechanical integrity. Nevertheless, doing so for a new material requires an intensive, in time and resources, experimentation stage in order to set proper manufacturing parameters. In this work, dimensional analysis is used to develop a general mathematical model on bulk density of SLMed components taking volumetric energy density, scanning speed and powder’s thermal conductivity, specific heat capacity and average grain diameter as independent variables. Strong relation between dependent and independent dimensionless products was observed. Bulk density is found to be proportional to volumetric energy density and be affected by scanning speed by a factor of negative two. Inconel 718 probes were produced and a particular expression, in the form of a first order polynomial, for its bulk density,in the independent dimensionless product π1 range from 3.17x10−8 to 4.6 x10−8 was obtained. In this range, better densification is achieved at lower scanning speed and lower laser power. The first is related to higher exposure time and ensuring full melt of the powder, and the second may be due to powder particle sublimation / ejection due to improperly large laser power conditions. An average relative density of 95.218% was measured. An average error percentage of 1.6503% between experimental and predicted bulk density (and dimensionless density) was achieved. A mathematical tool for tuning scanning speed to achieve full densification, with respect to laser power, was developed. Moreover, particular conditions for achieving so for Inconel 718 in the π1 range was provided.
- Stability analysis of multi-degree of freedom systems in milling operations: Altintas analytical method vs. chebyshev polynomial approximation-Edición Única(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2006-12-01) Araya Pérez, Francisco Javier; Elías Zúñiga, Alex; ITESM-Campus MonterreyChatter phenomena, essentially known as forced and self excited (regenerative) vibration, has long been a problem in machining operations. Many approaches trend to predict the limits of stable zones based on predictive machine tool chatter vibration theory derived by Tobias and Fishwick (S. A. Tobias, and W. Fishwick, 1958) and Tlusty (Tlusty, J. and F. Ismail, 1981). Different mechanistic models of exciting forces on the machine tool interface has been developed and compared with experimental data. However, since the dynamic cutting force is strongly influenced by the cutting parameters of the process, a great number of variations can be presented when machining a workpiece in milling operations. The importance of chatter study comes from productivity issues related to machining industry. Since the generated vibration affects the surface finish and dimensional accuracy of the workpiece, tool life and even machine life due to excessive wear, chatter becomes both quality and production issues that affect the cost of productivity of a Company. Thus, solutions to chatter problems have become increasingly important in manufacturing industry. Though chatter is simply a consequence of vibration within a machining system, finding causes for the vibration and developing corrective strategies is the main scope of chatter problems. The analytical method developed by Altintas is one of the most used to compute stability zones in milling operations. In this document, we use the Chebyshev approximation method, and compare the results with those obtained by Altintas (Altintas and Budak, 1998), Stepan (Stepan, et. al. 2002 (a)) and De LaCalle (De LaCalle, 2005). The stability analysis was done for one, two and three degree of freedom systems of milling operations.
- Determinación de las zonas de estabilidad en operaciones de corte ortogonal usando la función de lambert(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2005-08-01) Salome Delgadillo Molina, Eva M.; ELIAS ZUÑIGA, ALEX; 19150; Elías Zúñiga, Alex; Rodríguez González, Ciro; Ahuett Garza, HoracioEl presente trabajo de tesis está enfocado a investigar la aplicación del método desarrollado por Asi y Ulsoy para obtener los lóbulos de estabilidad en operaciones de maquinado en corte ortogonal y torneado. También, se desarrollan las expresiones matemáticas en las que se incluyen los efectos de desgaste de la herramienta y la fuerza de Coriolis. Además se presenta el desarrollo del procedimiento matemático requerido para obtener las zonas de estabilidad aplicando la función de Lambert. Para comprobar la validez de los resultados obtenidos mediante las soluciones desarrolladas, se comparan las gráficas de estabilidad con aquellas generadas al emplear los métodos clásicos de solución. Los resultados numéricos indican que las gráficas de estabilidad basadas en la función de Lambert tienden a predecir en operaciones de maquinado en corte ortogonal y torneado, mayores profundidades de corte que aquellas obtenidas mediante los métodos clásicos.
- Aplicación del método de Petrov-Galerkin local libre de malla a problemas unidimensionales del tipo C°(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2003-12-01) Esteva Sánchez, Milton Carlos; Elías Zúñiga, Alex; Gallegos Cázares, Sergio; Nungaray Pérez, Carlos; Programa de Graduados en Ingeniería; División de Ingeniería y Arquitectura; Campus MonterreyEn el presente trabajo se hace una implementación didáctica del método de Petrov-Galerkin local libre de malla en la solución de problemas unidimensionales del tipo Cº; poniendo especial énfasis en el desarrollo de cada una de las etapas de implantación del método tales como construcción de la función de aproximación, selección de la función de prueba y generación del sistema de ecuaciones algebraicas. También se presenta un algoritmo en donde se describe detalladamente la generación paso a paso de los elementos que conforman a las matrices de rigidez y a los vectores de fuerzas, lo cual permite tener entendimiento claro de la influencia que las funciones de peso tienen en la solución del problema. Todos los conceptos, etapas, procesos y algoritmos de implementación computacional para ilustrar la aplicación de esta técnica numérica se llevan a cabo a través de: la validación mediante "la prueba de la parcela" y con la solución de dos problemas. Uno relacionado con los desplazamientos y esfuerzos en una barra sometida a fuerzas concentradas y de cuerpo y el otro relacionado con un problema unidimensional de transferencia de calor en donde se analiza una aleta de enfriamiento.
- Relationship between physical and acoustical parameters for road surface characterization(Instituto Tecnológico y de Estudios Superiores de Monterrey) Leos Suárez, Jesús Rodrigo; Elías Zúñiga, Alex; Ibarra Zárate, David Isaac; Campus Monterrey; Ahuett Garza, HoracioAn acoustic system for automated road surface conditions detection from acoustic signals of surface interaction is introduced. The aim of this work is to obtain different characteristics of the roadway surface by which the vehicle is circulating, to analyze its texture, friction and other characteristics related to the road surface with anticipation so that this information could be used in future automotive safety applications. The advantages of using an acoustic device compared with other current technologies is the low cost of the equipment and its portability. The robustness of our approach is evaluated on audio that span an extensive range of vehicle speeds, noises from the environment, road surface types, and pavement conditions including international friction index (IFI) values from 0 km/hr to 100 km/hr. The training and evaluation of the model were performed on different roads to minimize the impact of environment and other external factors on the accuracy of the classification. The results showed that there is a correlation between what we measured with the mechanical systems and what we obtained as a reply from the acoustic system. The hypothesis is that with the application of an acoustic device that characterizes the pavement in real time, future automotive applications such as adjusting the ABS system automatically in an optimal range of braking, showing a warning indicator light on the dashboard, or improving the driving decision making of autonomous cars will be possible by having prior information of the slippery surface conditions in which the vehicle transits.