Ingeniería Mecánica

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Subject: search.filters.subject.ENSAYOS MECÁNICOS

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    Caracterización térmica, mecánica y microestructural de un material compuesto de matriz poliéster reforzada con fibra natural de banano y su posible aplicación industrial
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023-09) López Martínez, Erick Isaac; Valle Velasco, Pablo Raúl
    This study investigated the feasibility of using natural banana fiber as reinforcement in a polymeric material made up of polyester resin. The banana fiber was obtained from waste produced from a banana plantation in Ecuador, making it an attractive option due to its easy availability, low cost, and low environmental impact. Three different volumetric proportions were established (80 matrix - 20 fiber, 70 matrix - 30 reinforcement and 60 matrix - 40 reinforcement) to identify the compound with the best mechanical behavior. Mechanical impact, hardness and abrasion tests were carried out, following the ASTM D5628-10, ASTM D2240-15 and ASTM G0195-13a standards, respectively. In addition, microstructure analysis was performed using a Scanning Electron Microscope (SEM) and calorimetry with a Differential Scanning Calorimeter (DSC). The results highlight that the composite material with a proportion of 70 percent polyester resin and 30 percent fiber showed the best mechanical properties, with impact energy values of 0.23J, hardness of 73.1 Shore D, abrasion index of 23.4 (mg/cycle) and a peak temperature of 113.88 degrees Celsius. Banana fiber represents a promising alternative as reinforcement in polyester resin composites, and the composite with the ratio of 70 percent matrix and 30 percent reinforcement demonstrated optimal mechanical behavior. These results have important potential applications in various industries, such as construction, automotive, and aeronautics.
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    Diseño y construcción de un troquel de corte y perforado de platina metálica de espesor 1/8 de pulg. para la empresa ingeniería del acero y matricería en la ciudad de Ambato provincia de Tungurahua
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Pérez Pallo, Edgar Daniel; Pérez Salinas, Cristian Fabián
    The main objective of this project is to develop a methodology for the design and construction of dies that perform cutting and punching operations. It also allows the reader to understand how the optimization criterion works, creating a model using the Finite Elements method that facilitates the cutting process and perforated for a metal plate that has 1/8 inch of thick. For which a series of mechanical Traction and Bending tests were carried out, using the ASTM E8-16a and ASTM E290-14 standards respectively, to determine the properties of AISI SAE D3 steel commercially known as BOHLER K 100, steel selected for construction of the die To carry out the optimization of the punching process, series of simulations were carried out using a Finite Element software to determine the geometry of the punches that produces the least possible cutting effort when these operations are carried out. The results obtained through the simulations carried out by alternating the geometry of the punches allowed to determine values of the shear stress produced, from which the lowest value obtained was selected, which represents a reduction of 62% in relation to the effort obtained when the operation was simulated whit any specific geometry of the drilling punch.