Ingeniería Civil y Mecánica

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Subject: search.filters.subject.ESFUERZO DE FLUENCIA

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    Modelo de material para perfiles conformado en frío de sección transversal UV de acero A572, para espesores de 10 mm y 12 mm
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2024-02) Aldas Castro, Oscar Damián; Tasigchana Bonilla, Jimmy Ismael; Peña Jordan, Francisco Agustin
    The cold forming process generates an amount of residual stresses due to the presence of dislocations in the structure that produces an increase in the internal energy of the material. Currently, cold-formed steels have had a wide growth in the market due to their lighter weight, ease of forming and better mechanical properties. With the advances in technology, the behavior of complete sections can be studied in greater detail. The mechanical behavior of ASTM A572 grade 50 steel was studied, due to the cold forming process of the UV type section for 10 and 12 mm thickness. To evaluate the mechanical properties, specimens were obtained by water jet cutting, since they do not undergo stresses or thermal loads. Then, the hardness variability along the UV section was evaluated both in the internal and external part. Finally, the affected parts and the distance of the onset of residual stresses were identified through the visualization of the modification of the grain size. The results of the study by the cold forming process of UV type section for 10 and 12 mm thickness, show that there is a significant increase of the yield stress, a reduction of the ductility and there is no significant difference of the modulus of elasticity. In addition, the variability of Brinell hardness and grain affectation was determined at 1.1 times the plate thickness from the end of the curve.
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    Modelo de material para perfiles conformados en frío de sección transversal UV de acero a572, para espesores de 6 mm y 8 mm
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2024-02) Muzo Chico, Danny Alejandro; Córdova Acosta, Christian Alexander; Peña Jordán, Francisco Agustín
    There is a notable deficiency in accurate data and analysis concerning thick-walled structural sections, particularly those of the UV cross-section. There are studies on thin-walled cold-formed steels, there is a gap in structural engineering knowledge due to the lack of studies performed in the thick-walled environment and the lack of material models specifically designed for cold-formed UV cross-sections using A572 steel. The experimental work started using the cold forming process of a structural profile of UV cross section of ASTM A572 gr 50 steel with thicknesses of 6 mm and 8 mm, which by water jet cutting, standardized specimens were extracted to perform tensile, micrographic and hardness tests, which are performed under ASTM E8, ASTM E112, ASTM E18 standards, respectively. Data were collected from each test and their mechanical behavior was analyzed. Several comparisons were made between the results of curved specimens and flat specimens of each thickness, thus identifying the variations in their mechanical properties. The hardness tests indicate the zone of affectation being 1.6t, in addition to the affectation of the cold forming process. As a result, the tests performed yielded data on the microstructural behavior of ASTM A572 steel in the cold forming process, as well as its mechanical properties, which will be useful for the support of technical reports.
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    Modelo de material para perfiles conformado en frío de sección transversal tipo UV de acero a36, para espesores de 6 mm y 8 mm
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2024-02) Mayancha Vargas, Edward Joel; Quizhpe Bustamante, Boris Alexander; Peña Jordán, Francisco Agustín
    In order to determine the variation of mechanical properties such as hardness, yield stress, modulus of elasticity, maximum load, grain size variation and elongation percentage, comparing them in curved areas and flat areas of a cold-formed profile of UV type section. Tensile, hardness and micrographic tests were developed, ASTM A-36 steel material was used with thicknesses of 6 mm and 8 mm, obtaining specimens for their respective tests under ASTM E8 standards for tensile tests, ASTM E112 for micrographic and the hardness method used was Brinell HBW for hardness tests with ASTM E10 standard, when performing the tests and trials on the virgin material and the cold-formed material of UV type section, it was determined that there are better results of mechanical properties in the curved areas of the cold-formed profile due to its stress concentration, this much more specifically for the specimen of higher thickness for its cross-sectional area, after comparing all the results obtained it was observed that the maximum value of yield stresses in its curved part was 482.81 MPa compared to its wings that have a minimum value of 210.93 MPa. As a result, it was proved that there is a variation of mechanical properties after a cold forming process for an A-36 steel material, which will be very helpful for future research.