Unidad de Posgrado Civil y Mecánica

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Análisis de la influencia de las pruebas tecnológicas sobre las propiedades mecánicas de compuestos de resina polimérica reforzado con fibras naturales del Ecuador bajo norma ASTM
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Diseño, 2019) Salán Guevara, Luis Geovanny; Analuiza Maiza, Oscar Iván
This document responds to an investigative work, against the lack of knowledge of the degree of degradation of composites in the open air, for this purpose the study of the influence of UV radiation and humidity, considered as technological tests, on the mechanical properties of tensile and flexion in two types of composite materials, one with a matrix of polyester resin and reinforcement of cabuya fiber and the other with the same matrix of the previous one with banana fiber reinforcement, under ASTM regulations. In order to determine the percentage of humidity and UV affectation in the aforementioned composite materials, by comparing their properties and determining which one offers better anti-degrading benefits to technological tests, tensile and flexural tests were carried out in the pre and post phases exposure to them. From the experimental treatment of the data obtained, conclusions are established that determine that the composite with better characteristics to resist technological tests is one that uses banana reinforcement. Subsequently, it was validated its use within the automotive industry - body supported by the analysis of finite elements performed by the specialized software intermediary, determining that its ideal application is for internal cover for bus roofs.
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 Iván
In 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.
Análisis de las combinaciones porcentuales del material de aporte de una junta a tope en un acero ASTM A588 Grado A utilizando los alambres tubulares E71T1 y E81T1NI2 para determinar las propiedades mecánicas en la fabricación de superestructura para puentes
(2016) Analuiza Maiza, Oscar Iván; Paredes Salinas, Juan Gilberto
For the present research work, three types of percentage combinations of tubular wires were made in a butt joint steel ASTM A 588 Grade A. Afterwards, the test specimens were obtained to perform destructive test of traction, impact, double guidance and macrography in order to determine the mechanical properties. The analysis and interpretation of results helped to determine, the best combination of the filler material. Finally, a proposal of a WPS and PQR welding process is set up to combine 80% E71T1 - 20% E81T1NI2 along with CO2 as protection gas which has proved to be the combination with the best mechanical properties. This research project is based on the AWS D1.5 code, which contains the general provisions, design of connections, execution, techniques and qualification for the welding of bridges. The development of this project counted on the equipment of the laboratories and advice from civil engineering and mechanics faculty teachers of the Technical University of Ambato.
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 Iván
The 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].
Tecnología de fabricación de moldes para optimizar el proceso de moldeo por soplado de envases PET, en una planta embotelladora de bebidas
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Mecánica Mención Manufactura, 2021-01) Yugsi Llano, Diego Javier; Analuiza Maiza, Oscar Iván
Currently, the best designed and manufactured molds are not made in Ecuador, they come from foreign companies, increasing the cost of imports and manufacturing times of prototype molds for testing, factors that affect the efficiency of packaging production; therefore, the objective of this research project is to design the mold manufacturing technology and simulate the blow molding process of PET containers, which will be validated according to the specifications required by the beverage bottling plant in order to optimize times, manufacturing costs and process parameters. Mold manufacturing technology was designed through computer-aided design and manufacturing and engineering software (CAD/CAM/CAE) and the machining parameters and materials available in the country were established for the manufacture of each of the parts that make up a blow mold. With the development of the simulation of the blow molding process using computational fluid dynamics (CFD) software, the mechanical and thermal properties of the mold were evaluated and the thickness for the containers was determined, thus, the transfer temperatures were analyzed heat in the mold during the molding process according to process parameters of the bottling plant. Finally, a technological report was implemented to optimize the blow molding process, which describes the appropriate parameters to eliminate defects in the containers, which are a pressure of 32 bars, a temperature of 95 degrees centigrade, cycle time blowing speed of 2.5 seconds at a speed of 7.31 meters per second and a heat transfer coefficient of 6569.3 Watts, whose data is associated with the simulation run.