Examinando por Materia "RESISTENCIA DE MATERIALES"
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Publicación Acceso abierto Algoritmo de integración para materiales no lineales considerando los efectos de viscoplasticidad, endurecimiento cinemático no lineal y daño(2014-05-07) Gómez-Cataño, J. D. (Juan David)In the Finite Element Method (FEM) material non-linearities are considered through incremental formulations in terms of a pseudo-time variable for the case of rate independent models and a real time variable in the case of rate-dependent models. The incremental statement of the problem implies that the constitutive models need to be time-integrated at the local level. In this article we discuss a standard algorithm available in the literature where additionally we have incorporated the effects of non-linear kinematic hardening, viscoplasticity, and damage. The algorithm is incorporated into a FEM code. In order to verify the correctness of our implementation we have particularized the model to the case of a creep law available from literature for solder alloys. Numerical simulation results are compared with experiments taken from the literature.Publicación Acceso abierto Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas(2013-11-27) Gómez-Botero, M. A. (Maryory Astrid); Alzate, C. C. (Claudia Cecilia); Márquez, A. (Alexánder); Restrepo, José William; Jaramillo-Isaza, F. (Franklin)This paper presents a study of the thermomechanical properties of low carbon steel, AISI-SAE 304 stainless steel, aramid and carbon fibers. Moreover, surface aspect of mineral rock wool of and aluminosilicate wool reinforcements was analyzed prior and after submitting to heat treatments at 1000 ºC. The tensile resistance of the fibers was evaluated prior and after submitting to heat treatments at temperatures of 400, 600, 800 and 1000ºC depending on the degradation that they showed. Moreover, a thermogravimetric analysis was carried out on each kind of fiber to determine the changes in weight at different temperatures. The stainless steel fibers showed the highest mechanical stability, whereas the aramid fibers with treatments at 400ºC showed practically null mechanical properties.Publicación Acceso abierto Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón(2013-11-05) Gómez-Botero, M. A. (Maryory Astrid); Lousa, A. (Arturo); Esteve, J. (Joan)Chromium carbide coatings on steel are a good candidate for applications on forming and molding dies. The high mechanical strength, chemical resistance and high temperature stability of Cr3C2 phase can be compatible with the severe abrasive wear and corrosion found in those manufacture operations. In this work chromium carbide coatings deposited by means of RF magnetron sputtering showed carbon contents between 25 % and 58 % by EDS analysis. Hardness values of these coatings were between 15 and 24 GPa, being the hardest values in the samples with carbon content in the 39-53 % range. The abrasive wear behavior of the coatings was evaluated by using a dimple grinder with diamond powder. The volume of the abrasion craters was measured from the images obtained with the interferometric microscope, and further corroborated by geometrical volume calculation based in profilometer sections that were measured. Abrasive wear behavior showed a marked dependence with carbon content. The lowest abrasive wear was obtained for the coatings with the highest carbon content.Publicación Acceso abierto Guía de laboratorio 1: Identificación de esfuerzos(2013-09-30) Escuela de Ingeniería de Antioquia EIA; Tabares-Ramirez, F. (Fabio) (clb)Identify the different types of stresses induced to structural elements such as axial stress, shear stress and contact stress.Publicación Acceso abierto Lección Estática # 20 Análisis estructural(2014-06-12) Ospina-Muñoz, W. A. (Walter Antonio); Arango, S. (Sergio)Forces analysis on a simple structurePublicación Acceso abierto Lección Estática # 21 Análisis estructural(2014-06-12) Ospina-Muñoz, W. A. (Walter Antonio); Arango, S. (Sergio)Forces analysis on a simple structurePublicación Acceso abierto Lección Estática # 22 Análisis estructural(2014-06-12) Ospina-Muñoz, W. A. (Walter Antonio); Arango, S. (Sergio)Forces analysis on a simple structure. Nodes.Publicación Acceso abierto Lección Estática # 23 Análisis estructural(2014-06-12) Ospina-Muñoz, W. A. (Walter Antonio); Arango, S. (Sergio)Forces analysis on a simple structure. Nodes.