Ingeniería Mecánica

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Subject: search.filters.subject.BOX-BEHNKEN

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    Optimización - MSR del material compuesto de matriz epoxi reforzado con fibra natural chambira (Astrocaryum) y sintética (Kevlar) 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, 2023-02) Moreno Robalino, Jonathan Patricio; Paredes Salinas, Juan Gilberto
    In the following work we will focus on the elaboration and characterization of the search for new hybrid and low weight sandwich materials, using different configurations in the reinforcement stacking. In order to achieve a reduction in weight and facilitate the elaboration, an epoxy resin reinforced with chambira fiber woven with kevlar fiber was used, taking into account the number of layers and positions to be worked, using the vacuum resin infusion method and its impact on the mechanical properties, for the specimens a curing at different temperatures and laser cutting with CO2 was performed. The Box-Behnken design method based on response surfaces was used, which allows the input of three continuous factors with their levels respectively, which are detailed as follows: Fiber Orientation 1 and Orientation 2 between 45, 0 and -45 degrees and curing temperature with 60, 90 and 120 degrees Celsius. At the time of the design, the number of treatments to be carried out was specified and in the mechanical tests of each sample, an analysis of the data was made and organized and validated in order to have their mechanical properties. The tests performed on the specimens yielded several results which helped to determine the most optimal configuration of the layers.
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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 de respuestas múltiples (DOE/MSR) de propiedades mecánicas del material hibrido de matriz epoxi reforzada con fibra sintética (vidrio) y natural (chambira)
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2022-01) Chuquitarco Taco, Santiago Wladimir; Paredes Salinas, Juan Gilberto
    The experimental work was carried out based on analysis of the results of mechanical properties of the hybrid material with reinforcements of chambira fiber and glass with epoxy resin matrix, formed by vacuum stratification, cured in different temperatures and subjected by laser cutting with CO2 of the samples. The use of Response Surface Methodology with Box-Behnken design allowed the entry of three continuous factors with their levels respectively are: Orientation 1, Orientation 2 of the fiber between -45, 0 and 45 degrees and Curing temperature with 60, 90 and 120 degrees Celsius. In the design, the number of treatments to be obtained was specified so that the mechanical tests of each sample were elaborated, the data obtained were organized and validated with the fulfillment of the parametric assumptions having full reliability in analysis of the mechanical properties. With the results obtained, the optimal configuration of the mechanical properties was determined, which are presented in factors with the orientation 1 to 28.68 degrees, orientation 2 to 1.36 degrees and at a curing temperature of 120 degrees Celsius. These values were given by means of the analysis of variance ANOVA the same that has significance and reliability in its data, therefore, the model of the Surface Design DOE / MSR explains up to 99.6 percent of its variability of the properties in that way the global desirability has the value of 0.6373.
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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.