Ingeniería Mecánica

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    Caracterización y fabricación de madera plástica a partir de la mezcla de aserrín de Pigüe con tereftalato de polietileno reciclado
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2024-06) Mesias Erazo, Gilber Israel; Nuñez Nuñez, Omar Israel; Paredes Salinas, Juan Gilberto
    In the field of Materials Engineering, the demand for improving the mechanical properties of new materials is growing. Experimental design (DOE) with response surface methodology (MSR) under Box– Behnken design was used in this experimental work. This approach allows the manipulation of three input factors with three levels each: extrusion temperature (160, 170 and 180 degrees Celsius), size of Pigüe scrape fibers (No.30, No. 40 and No. 50, under ASTM E11) and percentage of recycled polyethylene terephthalate (PET 1) (92, 95 y 98 percent). To investigate the behavior of the results obtained and identify their optimal performance points. This methodology facilitated the evaluation of mechanical properties by means of traction tests (ASTM D638-14), compression tests (ASTM D695-15) and flexion tests (ASTM D790-17), followed by the compilation and analysis of the data obtained. Traction, compression and flexion results were tabulated and an analysis was carried out which cast the following suitable case: a thimble number of 30 (ASTM E11) for the size of the particles of the shell, with a 98 percent percentage of PET 1 in the mixture and an extrusion temperature of 160 degrees Celsius. This suitable case exhibits the following mechanical characteristics: for traction, a strength of 13.97 MPa, for compression, a resistance of 3.60 MPa and for bending, a maximum effort of 19.84 MPa. Finally, the design regression model MSR reflects a global desirability value of 0.6085. Keywords: MSR, Box–Behnken, Pigue, PET recycled, D
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    Optimización - MSR del material compuesto de matriz epoxi reforzado con fibra natural Chambira (Astrocaryum) y sintética (carbono) mediante infusión de resina al vacío y su incidencia en las propiedades mecánicas
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023-03) Palacios Palacios, Milton Enrique; Paredes Salinas, Juan Gilberto
    Today in the field of Materials Engineering there is a great demand to improve the mechanical properties of new materials that are being designed and thus be able to meet the needs that the user requires. The experimental work was carried out under the (MSR) (Box-Behnken) methodology, which establishes three input factors with three levels for each one, thus allowing to determine the orientation of the fibers and the curing temperature. The values considered were: -45, 0, and 45 degrees and the temperature 60, 90, and 120 degrees Celsius. The conformation of the specimens was carried out by means of a vacuum system by infusion, the same one that allowed to obtain better results in the surface of the material avoiding the porosity, later the curing of the material was carried out at the established temperatures, in addition, it was carried out a laser cut. The results obtained from the tensile, bending and impact tests were tabulated and analyzes were carried out, yielding the following results: that the best combination of fibers to obtain an optimal material should be carried out with orientation1 -10.4545 degrees and orientation2 -37 .2727 degrees; that the curing temperature 120 degrees Celsius and the MSR design regression model explains an overall desirability value of 0.5953.
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    Optimización - MSR del material compuesto de matriz epoxi reforzado con fibra natural Chambira (Astrocaryum) y sintética (vidrio) mediante infusión de resina al vacío y su incidencia en las propiedades mecánicas
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023-03) Tipantasig Pérez, Johnny Israel; Paredes Salinas, Juan Gilberto
    The present experimental work seeks to determine the optimization of the mechanical properties of the compound developed by means of an Epoxy resin matrix (Aeropoxy), reinforced with two layers of natural chambira fiber (Astrocaryum) and a synthetic glass fiber (Fiber Glass HexForce 7788), using the vacuum resin infusion method, subjected to curing of the specimens to finally fragment them through laser cutting. Applying the Response Surfaces Methodology, the Minitab statistical analysis software was used in which the mechanical properties of the composite material were analyzed, using the Box-Behnken design in which we entered 3 input factors with 3 levels each: Orientation 1 (-45.0.45) degrees, Orientation 2 (-45.0.45) degrees and the temperature (60,90,120) degrees Celsius. In the design, the total number of samples to be obtained was indicated and later the respective treatments were carried out to execute the destructive mechanical tests of each case. These results were validated by complying with the parametric assumptions specified in the design. Through the ANOVA analysis of variance, the global analysis was determined with the best combination of the mechanical properties that interact in the process, which gave us values for orientation 1 of 23.18 degrees, orientation 2 of -10.45 degrees and a temperature of 60 degrees Celsius, also in the global optimization a desirability of 0.5173 was obtained.
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    Optimización de respuestas múltiples (DOE/MSR) de propiedades mecánicas del material híbrido de matriz epoxi reforzada con fibra sintética (KEVLAR) Y natural (CHAMBIRA)
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2022-03) Amaya Jaya, Liliana Estefanía; Paredes Salinas, Juan Gilberto
    The present experimental investigation began with the elaboration of a hybrid material of epoxy resin matrix and chambira and kevlar fiber reinforcement, based on the optimization of the mechanical properties and through the analysis under the response surface methodology. The composite material was molded using a vacuum stratification method to be cured at different temperatures, after which a laser cutting process was carried out. For the analysis, the factors that intervened directly through the Box-Benken design were taken into account, orientation 1 of -45.45 and 0 degrees, orientation 2 of -45.45 and 0 degrees and temperature of 60, 90 and 120 degrees centigrade, with the exact number of factors, a specific configuration of factors and levels was made, its parametric assumptions executed by the ANOVA variability analysis after the execution of the tests being valid, giving as an optimal result a predicted value of an orientation 1 (-7.727 degrees), orientation 2 (3.18 degrees) and temperature (106 degrees centigrade), presenting a desirability of 0.4887 percent, which allowed reaching highly favorable values for all its properties.
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    Optimización de respuestas múltiples (DOE/MSR) de propiedades mecánicas del material híbrido de matriz epoxi reforzada con fibra sintética (carbono) y natural (Chambira)
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2022-01) Freire Paguay, Diego Romario; Paredes Salinas, Juan Gilberto
    Due to the demand that exists today in Materials Engineering, as the days go by, it has always been sought to help improve the mechanical properties of the new design thus meeting the user's need. The specimens were designed under the methodology (DOE / MSR) (Box – Behnken) which allowed to determine the orientation of the natural fiber, synthetic fiber and the temperature. The values that were considered were -45, 0, 45 degrees and the temperature 60, 90, 120 degrees Celsius. With the help of (Box – Behnken) 15 cases with 3 replicates were determined to determine the mechanical properties. The results obtained from the three tests were tabulated and it was observed that the best combination to obtain the optimum material should be performed with orientation1 45 degrees, orientation2 35 degrees and curing temperature 60 degrees Celsius and the MSR design regression model explains up to 95.61 percent the variability of the properties, with an overall desirability value of 0.989.
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    Optimización bajo metodología de superficie de respuesta (MSR) del material compuesto de matriz epoxi reforzado con fibra de Chambira (Astrocaryum), curado al ambiente y su incidencia en las propiedades mecánica
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2022-01) Tintín Chicaiza, Andrés Santiago; Paredes Salinas, Juan Gilberto
    The present experimental work carried out the analysis of the mechanical properties of the epoxy resin composite material reinforced with chambira fibers, the material was molded through vacuum stratification with ambient curing in different periods of days. For the analysis to be carried out, the Response Surface Methodology (MSR) was proposed, using the Box-Behnken design establishing three input factors, each factor had three levels: orientation 1 of the chambira fiber: -45, 0, 45 degrees, orientation 2: -45, 0, 45 degrees and cure time of 12, 22 and 32 days. The design showed a specific number of treatments with different configurations of factors and levels for the destructive test of the specimens, the data obtained in this process were validated with the fulfillment of the parametric assumptions. The ANOVA variability of the values obtained in the MSR design was analyzed, emphasizing the significant effects and their incidence on the mechanical properties. Once the previous analysis had been carried out, the optimization of each mechanical property analyzed by means of the global desirability function. An optimal configuration was obtained by combining orientation 1 at 4.09 and orientation 2 at 6.81 degrees of spin and a cure time of 32 days, the composite desirability is 0.8323 and the variability of the properties is 99.95 percent.
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    Optimización bajo metodología de superficie de respuesta (MSR) del material compuesto de matriz epoxi reforzado con fibra de chambira (astrocaryum) y su incidencia en las propiedades mecánicas
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-09) Plasencia Tercero, Jhonny Michael; Paredes Salinas, Juan Gilberto
    The experimental research is focused on the mechanical characterization of the epoxy resin composite reinforced with chambira fiber. In the experimental work, the analysis of the mechanical properties of the new composite material was carried out, which was molded by vacuum stratification and later cured at different temperatures, in addition, subjected to CO2 laser cutting. The research raises the analysis of the response surface methodology directed to the BoxBehnken design which establishes three input factors with three levels for each factor: fiber orientation OC1 -45.0, 45 degrees, OC2 -45, 0.45 degree and curing temperature of 60, 90, 120 degrees centigrade. The design suggests a specific number of treatments for the destructive test of the specimens, data that will be validated by fulfilling the parametric assumptions. From the analysis of variance (ANOVA), the adequacy of the model for each mechanical property was corroborated, emphasizing the significant effects and their incidence on the mechanical properties, to complement the analysis, the optimization of each treatment is carried out through the desirability function. The results reveal that the optimal configuration of the composite material where the mechanical properties are used is by combining the OC1 of -35.9 degree; the OC2 of 45 degree and a temperature of 60 degree centigrade, predicted values of desirability with a value of 0.5871, it is also understood that the model explains 96.6 percent of the variability of the properties.