Browsing by Author "RIVERA VILLALOBOS, ISAAC AARON"
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Thesis ESTUDIO NUMÉRICO DEL EFECTO DE LA TEMPERATURA SOBRE LA PRESENCIA DE UNA GRIETA CERCANA A LA SOLDADURA DE UNA UNIÓN CIRCULAR EN T.(Universidad Técnica Federico Santa María, 2015) RIVERA VILLALOBOS, ISAAC AARON; PEREZ POZO, LUIS CARLOS; Universidad Tecnica Federico Santa Maria UTFSM DEPARTAMENTO DE INGENIERÍA MECÁNICA; ROSALES HUERTA, CARLOS EDUARDOThe Finite Element Method in the recent decades has become the most powerful technique to design, modeling and simulation in mechanical engineering. It has multiple applications in the analysis and design on different fields such as hydraulic, heat transfer, solid mechanics, fluids mechanics, among others. Allows the modeling of complete designs, refining and optimization for detailed display of strength, stiffness, stress, strain, displacement with high accuracy, enhanced design and better insight of the critical design parameters. In this study the Finite Element Method is used to obtain the global solution of a circular hollow section welded T-joint supported by the chords under tensile loading at the end of the brace which it has generated an elliptical crack at the bottom of the weld. To evaluate the local response of the welded joint a sub-modeling technique is used, which allows greater refinement of mesh and a better precision results in the area next to the crack. To evaluate the model, is calculated the displacement of the point of application of the load at the free brace to a temperature of 20, 200, 400 and 600 °C, the strain field of the critical zone for the four different temperatures and opening area of the crack to the most critical case. The results obtained using the MEF technique of sub-modeling in displacement the point of application of load is expected, since the higher temperature is higher displacement. For the deformation of the critical zone modeled curves are similar and closer the weld is greater deformation. The opening of the mouth of the crack is governed by a linear curve and an offset of 0,03 mm.
