Browsing by Author "Riera Riera, Marilyn Johaira"

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Estudio del proceso de corte láser de CO2 del material compuesto de matriz polimérica reforzada con fibra de abacá
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2019) Riera Riera, Marilyn Johaira; Pérez Salinas, Cristian Fabián
In the present experimental work the process of Laser Cutting by CO2 was carried out, in which two sheets of composite materials were made as: (polyester resin combined with abaca fiber) and (epoxy resin combined with abaca fiber), which they were subjected to cuts; therefore, an analysis process based on the surface response method was proposed, in which the cutting parameters intervened, such as: power, speed and resin with their different levels; generating a total of 26 combinations with their replicas and obtaining a total of 52. Once the cuts were made, the surface quality of the material was evaluated by means of the surface roughness (Ra), for which a Mitutoyo SJ-210 rugosimeter was used, achieving thus to determine the minimum surface roughness of the material of 3.4833 μm, fulfilling like this with the established in ISO Standard 1302; the critical temperature (T) of the cut was also determined through calculations and temperature measurements of the surface were taken while it was cutting with the pyrometer, and getting a lower critical temperature which undoubtedly decreases the amount of material burned. A complementary test was carried out in which the flammability index of the composite materials was obtained, the process to perform these essays is detailed in the ISO 3795 standard; the combustion index was calculated obtaining 15.9 and 19.9 mm / min respectively, fulfilling like this with the requirements of the standards, since they do not exceed the maximum combustion index of 100 mm / min and 250 mm / min established in the standards NTE INEN 1668 and NTE INEN 1323 respectively.