Ingeniería Civil y Mecánica
Permanent URI for this communityhttp://repositorio.uta.edu.ec/handle/123456789/898
Browse
8 results
Search Results
Item Determinación de la resistencia de la junta traslapada simple, entre el acero estructural, resina epóxica y fibra de carbono unidireccional, utilizando métodos de limpieza superficial alternativos(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023) Escobar Altamirano, Jordi Javier; Peña Jordán, Francisco AgustínSandblasting is a cleaning and texturing process based on the projection of an abrasive material on a surface, with a wide industrial use in oxide, impurities and dirt removal processes. However, it is an operation with certain disadvantages, such as its high cost, high waste generation and risk to the health of operators. It was investigated that there is a directly proportional relationship between roughness and the maximum shear stress that an adhesive bond can withstand. Since this technique has given one of the best results, alternative methods such as a steel bristle disc at 2300 rpm and rectangular sander equipped with a 30 grade sandpaper were used in order to obtain similar data. This was developed on A36 structural steel and unidirectional carbon fiber specimens, sized according to ASTM D1002 and bonded with epoxy resin in a simple overlapped joint. The results were obtained by applying tensile tests, obtaining a better result in the specimens treated with steel bristle disc, obtaining average values of 10.522 micrometers in roughness, 8262.5 N in maximum force and 9.6 MPa in maximum shear stress. When comparing and applying a parametric statistical test between the results obtained with the information obtained from previous research, it was found that there is no significant difference between the two techniques.Item Análisis de la resistencia de la junta traslapada simple, entre el acero estructural, resina epóxica y fibra de carbono unidireccional, utilizado para reforzamiento de vigas de acero(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2022-09) Guerra Chiquito, Carlos Daniel; Tigmasa Paredes, Luis Giovanni; Peña Jordán, Francisco AgustínCarbon fiber is a material that provides excellent properties in different situations, one of these is structural reinforcement, due to the fact that it increases the resistance and stiffness of the structure without adding dead loads. One way to bond carbon fiber to steel is by means of epoxy resin which will create an adhesive bond; however, detachment can occur. According to previous research, spalling occurs because of the shear strength of the adhesive. Therefore, we proceeded to improve the shear strength of the adhesive bond by applying four surface treatments to the steel layer, these were manual cleaning, grinding disc, sanding disc and sandblasting. Comparing the results obtained, it was demonstrated, through real tests, that the roughness of the steel is directly proportional to the shear strength of the bond. Due to this, the Sandblasting treatment was the one with the best results due to its high degree of roughness with an average value of 10.79 μm and a maximum shear stress of 10.72 MPa.Item Diseño del alcantarillado sanitario y pluvial para mejorar la calidad de vida de la parroquia Puerto Misahuallí, cantón Tena, provincia de Napo(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2021-07) Moya Andino, Adriana Carolina; Irazábal Villamarín, Marcos Paúl; Moya Medina, Dilon GermánFor the development of this project, the design of sanitary and storm sewers and a proposal for a wastewater treatment plant were proposed to minimize the contamination of the waters that are discharged to the main water tributaries of the parish since it is a highly tourist area. . To carry out the topographic studies, the georeferenced total station was used, with two existing BMs on the site, which guaranteed that the survey had a minimum margin of error, after which the design was carried out in the Civil 3D software taking into account the regulations: national and international for the design of sewerage networks; the use of PVC-type pipe with a nominal diameter of 250 millimeters, with a length of 6844.66 meters in the sanitary sewer, a nominal diameter of 400 millimeters, with a length of 466.59 meters and 600 millimeters in nominal diameter, with a length of of 4498.29 meters for the storm sewer, verifying that all the established hydraulic parameters are met. At the end of the design, twenty four detail plans, 3 hydraulic calculation sheets, 5 water treatment plant design calculation sheets and a referential budget of USD 2,806,737.38 cents were obtained as a final product so that in a In the future, this project can be executed, thus contributing to the development of the Puerto Misahuallí parish.Item Desarrollo de un sistema híbrido “Plug and Play” de lubricación pulverizada con nanofluido y fluido criogénico para mejorar los procesos de mecanizado por arranque de viruta torneado(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Manufactura, 2021-07) Arias Soto, Diego Rafael; Núñez Núñez, Diego FernandoThe present research work focuses on the development of a hybrid system, which increased the surface quality of the machined material; CO2 was used for the cryogenic fluid and the MQL system with biodegradable oil Unist Coolube 2210 EP with TiO2 nano particles as additive for the spray lubrication. The system was evaluated using an experimental methodology applying a design of experiments of 8 runs where it was proposed to run the experiments with cutting speeds of 235 and 195 m/min and feeds of 0.1 and 0.2 mm/rev using a cutting tool, a sintered carbide insert CNMG120408 in a material applicable in the Ecuadorian industry such as API L80 steel pipes with an outer diameter of 3.5 inches. For the measurement of the surface finish, a measuring instrument, the Mitutoyo SJ-210 roughness meter, was used, while for the measurement of the cutting tool flank wear, the VB life criterion equal to 300 micrometers in zone B of the insert established by the ISO3685 standard was evaluated with the help of SEM scanning microscopy. The results obtained were favorable since an increase in the cutting tool life of up to 40 percent was obtained, while in the surface finish minimum Ra roughness of 0.4 micrometers was achieved; therefore, it was possible to establish that the proposed system is efficient in this machining process.Item Análisis de la influencia de un dieléctrico ecológico sobre la rugosidad superficial en el maquinado del acero K100 mediante el proceso de electroerosión por hilo (WEDM)(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Diseño, 2020) Molina Molina, Diego Patricio; Analuiza Maiza, Oscar IvánIn the Ecuador, non-conventional mechanized process have carried an analysis that is referred to the form of production of mechanic elements of complex geometry, that’s why the necessity of investigate the cuts of wire electroerosion (WEDM); using an alternative dielectric which is ecological in base to the electrochemical effect, for the aim of substitute the common way of coolant without the alteration of the final roughness and hardness on the cutting section, and preserve the equipment integrity, and contributing to the factories dedicated to the sheet metal process, to the ecology and the environment around us. The mentioned process goer together with the adequate cutting parameters study, based on an experimental investigation lead to characterized the representative ones of the surface finishing. The analysis is based on a comparative treatment which permits knowing the variability of the roughness and hardness acquired amounts on the cutting section through a variances analysis ANOVA about the factors that influence on the cutting process, in addition observe the presence of possible alterations on the cutting zone through the application of a scanning electron microscope (SEM). Having as a result the applicability of the alternative dielectric because under the influence of the same is achieved to obtain in average a significant value of roughness equal to 4,658 micrometers which is less to the achieved average amount with the application of the coolant, where the average is 5,253 micrometers. Furthermore, the surface represents less rate of irregularities, and one significant average to hardness it is referred. That is why the ecologic fluent gets to substitute easily, achieving with the asked expectations for the mechanized type.Item Estudio de la rugosidad superficial y el desgaste de herramientas de carburo en el proceso de torneado para una aleación de aluminio AA 7075-T6 (PRODAX)(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Diseño, 2020) Ramírez Gangotena, Leonidas Esteban; Analuiza Maiza, Oscar IvánThe aluminum alloy AA 7075-T6 has advantages due to its mechanical properties, its good machinability and its understandable cost compared against other materials. Therefore, it has a great field in its industrial applications, especially in the automotive industry, aviation, marine, injection, among others. The aim of this investigation is to study the impact of the cutting parameters in the surface roughness and the tool wear, for the CNC turning machining of an aluminum alloy AA 7075-T6. An experimental methodology has been used and the considered factors were the cutting speed (Vc), feed rate (f), cutting depth (Ap) and the experimental essays were done with two levels for each factor. The turning machining was carried out in a CNC turning machine, EMCO brand model EMCOMAT E-200 by doing 16 essays according to the arrangement, by the corresponding experimental design of a complete factorial. Thus, it was established the factors that influence in the surface finish and the cutting tool wear. By using an ANOVA analysis of variance, it was determined that, for a surface roughness, the feed rate influences in 95.91 percent, the cutting speed 0.00803 percentage, the cutting depth 0.1813 percent and the type of cutting tool 1.22 percent. Meanwhile, for the cutting tool wear, the feed rate influences in 0.94 percent, the cutting speed 1.84 percent, the cutting depth 3.954 percent and the type of cutting tool 82.136 percent. In function of the analysis of the obtained results, it was determined the optimum cutting parameters, establishing a cutting speed of 400 [m/min], feed rate of 0.1 [mm/rev], cutting depth of 1.5 [mm] and chemical vapor deposition covering (CVD) as type of cutting tool. Under these parameters, the surface roughness (Ra) was 0.7098 [µm] and the cutting tool wear was 0.9233 [µm].Item Estudio de calidad superficial y desgaste de herramientas en el proceso de rectificado plano sobre hierro fundido(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Fiallos Zamora, Luis Fabián; Pérez Salinas, Cristian FabiánThe main objective of this experimental work is to study the surface quality of the cast iron and wear of the tools, silicon carbide stone and aluminum oxide in the grinding process of flat surfaces on the cast iron material with the different parameters that influence these processes. These two tools were used since they are those that exist in the national market and those that meet the requirements to perform this type of machining. The tool of silicon carbide has dimensions of 125x60x15 mm and with a hardness of 50 HRC, and the grinding wheel of aluminum oxide with dimensions of 110x60x20 mm and with a hardness of 60 HRC. The machine in which the experiments were carried out was the machine for rectifying flat surfaces of motors (headstocks) of Chinese origin, model 3M. 18 experiments were carried out with different cutting parameters with the tool of silicon carbide, of the same way we performed 18 remaining experiments with the aluminum oxide tool, taking a total of 36 experiments for both roughness and wear. The parameters that have significance in the surface roughness is the type of tool used, while for wear is the speed of advance of the work table. Finally, the surface roughness (Ra) obtained in the cast iron head was measured with a Mitutoyo SJ210 rugosimeter under the ISO 1997 standard, with which it was possible to determine that the roughness level is lower with the silicon carbide tool than with the aluminum oxide tool. The highest roughness value was 3,000 μm with the aluminum oxide abrasive wheel and the lowest value was 1,008 μm with the silicon carbide abrasive wheel. We also measured the wear (G) of the same tools obtained with the scale KERN model FKB301A with a sensitivity of 0.1 g, in the same way the highest value of wear was 69.19 with a feed rate of 13000 mm / min and the lowest value was 17,05 with a feed rate of 20,000 mm / min.Item Incidencia del incremento de tráfico en el costo del mantenimiento de la carretera Calpi - San Juan - El Arenal - empate vía Ambato Guaranda(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Vías Terrestres, 2015) Ronquillo Paucar, Antonio Vicente; Almeida Lema, Vinicio FabiánDebido al incremento de tráfico vehicular que circula en la carretera Calpi-San Juan-El Arenal-Empate vía Ambato-Guaranda de 41 Km de longitud y ancho de calzada de 9.0 metros en promedio, cuya capa de rodadura es de doble tratamiento superficial bituminoso DTSB y que se encuentra actualmente con fallas en la estructura del pavimento debido a las cargas de vehículos pesados, es necesario intervenir realizando labores de mantenimiento tanto rutinario como periódico de una manera eficiente, además de su pronta rehabilitación. Realizados los estudios técnicos de ingeniería, se propone dos alternativas de solución al problema: La alternativa No.1 de base asfáltica disminuye el espesor total de la estructura, pero sumando los espesores de base asfáltica + carpeta asfáltica, son mayores que la alternativa No.2 de base granular, por la razón indicada, se recomienda optar por la alternativa No.2.