Browsing by Author "Pérez Salinas, Cristian Fabian"

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Análisis de dureza, resistencia a la tracción y desgaste de materiales termoplásticos obtenidos a partir de la resina Tough de prototipado robusto para impresión 3D por estereolitografía (SLA)
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-01) Villena López, Oscar Rodrigo; Pérez Salinas, Cristian Fabian
For this experimental work, Clear resin and Tough resin were used. Clear resin is one of the most widely used commercial prototype resins. On the other hand, Tough resin is used in the engineering field (mainly in scale mechanical components). All these resins are used in stereolithography 3D printing. The investigation considered 3 different post-cure times, all of them recommended by the manufacturer. Three types of curing were used: no curing, normal curing and maximum curing. For the Clear resin, post-curing times of 0, 15 and 30 minutes were applied under the incidence of UV rays. While for the Tough resin, times of 0, 60 and 120 minutes were considered. The CAD models were produced taking into account international testing standards (ASTM D638 and ISO 9352). This is due to hardness, traction and abrasion tests. The abrasion and hardness tests were carried out in the university laboratories. The tensile test is a compendium of several authors whose information has been verified and approved, that is, their level of confidence is high. Once the tests had been carried out, it was determined that the standard resin (Clear), in terms of hardness, has a higher grade compared to Tough. On the other hand, Engineering resin (Tough) has less resistance to abrasion. The tensile results affirm that both resins do not have a marked difference in their behavior.
Diseño de un punzón para corte-troquelado de un material compuesto de matriz polimérica reforzado con fibras naturales
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-06) Acosta Castro, Lucas David; Pérez Salinas, Cristian Fabian
In the present project, a punch was designed and built with the purpose of being used in composite materials, in such a way that it was analyzed whether the type of punch configuration, the type of reinforcement fiber and the type of matrix influence the quality of the cut. Four different configurations were used for the study: straight, Wshaped, double shear at 20 degrees and single shear at 30 degrees; which were designed in a CAD with a diameter of 12.7 mm and a height of 70 mm. The study focuses on the simulation through the application of the finite element method in a specialized software where the dynamic behavior of the various types of punch was evaluated and through which six types of composite materials were designed and used for each simulation. In order to validate the simulations carried out, we chose to build the punches with their various secondary components to be evaluated and tested in two composite materials: One made of epoxy resin with jute fiber and the second of polyester resin with jute fiber. Once the punching test was performed, the cuts were evaluated, resulting in a delamination factor at the entrance of 1.046 and at the exit of 1.066; in this way it was analyzed that the W punch is the ideal cutting tool for the application in composite materials.
Estudio de las propiedades de componentes termoplásticos, obtenidos a partir de la resina ingeniería-tough y resina standard en orientación paralela, mediante la aplicación de la técnica aditiva para impresión 3D (SLA)
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-07) Yumbolema Narváez, Darío Javier; Pérez Salinas, Cristian Fabian
The present experimental work was focused on the study of the properties obtained from a thermoplastic component obtained by applying the additive technique of 3D printing SLA. The specimens were obtained by applying a high-power laser beam in order to harden the liquid resin to form the desired three-dimensional elements, that is, Type I and Type II specimens, which are used in Hardness and wear tests respectively. For the elaboration of these samples, two types of components were taken into account, standard resin and Ingenieril Tough resin with the aim of making a simultaneous comparison between them after the stereolithographic process. In determining the weight, a digital analytical balance of thousandths of grams in precision STX 223 OHAUS recommended by the ISO 9352 standard of abrasive wheel wear was used; the data on wear was carried out in the Taber Type Abrasion tester with the abrasive wheels H22. The Hardness test was performed using the Shore D Durometer and the ASTM D2240 standard in the Laboratory of the Technical University of Ambato.
Fabricación del mecanismo de conformado de la punta de un tubo hipodérmico usado en un dispositivo mecánico generador de flujo con presión positiva CPAP usado como alternativa en el tratamiento de pacientes con covid-19
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-09) Ramos Freire, Christopher Vicente; Morales Criollo, William Mauricio; Pérez Salinas, Cristian Fabian
With the development of the mechanism system for shaping the tip of a hypodermic tube, it will allow the manufacture and adaptation of this fundamental internal element of the respirator, consequently it will help to reduce the time of elaboration and assembly of the same. The methodology of this technical project begins with an evaluation of the information provided by the Mercedes AMG company and the UCL. For the design of the deformation mechanism of hypodermic tubes, SolidWorks software was used, while ANSYS software was used for simulation, in which an analysis of the machine's infrastructure was carried out to determine that there is no overstress and that it may cause failures; likewise, an impact analysis was carried out in a specific contact region, between the tip and the hypodermic tube, based on a height of fall of an element (weight), in order to determine the deformation of the tube. Finally, the construction of the machine was executed. Functional tests were carried out in the laboratory of the Faculty of Civil and Mechanical Engineering, where results of 1.31 mm (average value) of deformation of the hypodermic tube were obtained, tests that were adapted with the simulations carried out, resulting in a correct operation of the mechanism.
Influencia de la exposición a la intemperie en el desgaste de un material compuesto de látex y partículas de gránulo de caucho reciclado
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-03) Criollo Rojas, Jennifer Ashley; Pérez Salinas, Cristian Fabian
The development of this research is focused on the material composed of the matrix of latex and recycled rubber granule particles (PGCR) as reinforcement, since this composite has optimal peculiarities for the elaboration of floors. For the development of this study, the variation in the percentage of reinforcement was taken into account in such a way that, it is possible to show which of the volumetric configurations has the best properties of Wear and Hardness. The tests were applied according to the specifications of the wear standard ISO 9352, Hardness ASTM- D2240 and ASTM D 1435 for outdoor exposure. Through the application of experiment design (DOE), a complete overall factorial design was made from which six volumetric configurations were obtained with a reinforcement variation of twenty, thirty and forty percent. The material behaviour was then analysed using the Taber wear test, measuring Shore D hardness using ISO and ASTM standards respectively. At the end of the execution of the tests by means of tables and graphs it is evident that the percentage of wear for the three reinforcement variations is minimal, yet the statistical analysis shows that the exposure time has an influence on the wear rate and that the volumetric configuration that best fits a real flooring application is 80 percent Latex (matrix) and 20 percent PGCR (reinforcement) , at zero days of exposure as it has less wear and greater hardness.