Authors: Chrystopher Vaca Terán; Javier Martínez-Gómez; Julio César Leguísamo Milla
Addresses: Universidad Internacional SEK Ecuador, Quito, EC170134 Quito, Ecuador; Instituto de Investigación Geológico y Energético (IIGE), Quito, Ecuador ' Universidad Internacional SEK Ecuador, Quito, EC170134 Quito, Ecuador ' Universidad Internacional SEK Ecuador, Quito, EC170134 Quito, Ecuador
Abstract: The aim of this study was to select the best material using the multi-criteria decision methods, obtaining the best results and the respective choice of material, optimising surface fatigue and increasing its resistance to wear applied to a gearbox. For which the multi-criteria decision methods were done to obtain an order or ranking of the set of alternatives. To obtain this ranking, the set of alternatives must be well defined, just as the criteria must be well determined. After using the multi-criteria, it was determined that the material chosen according to the ranking and is the third alternative that has relevant characteristics such as elastic limit, tensile strength and good thermal capacity. The entropy method applied to the weights helps avoid the subjectivity of the designer and make it conform to real parameters. According to the methods COPRAS, TOPSIS, PROMETHEE and VIKOR; the best material is the AISI 4140, due to the best mechanical and thermal properties. On the basis of the numerical results, it can be concluded that the proposed methods can deal with the problems of material selection with the dependence of criteria.
Keywords: multi-criteria decisions methods; MCDM; material selection; weighting and classification factors; criteria dependence; helical gear.
International Journal of Mathematics in Operational Research, 2020 Vol.17 No.1, pp.90 - 109
Received: 08 Feb 2019
Accepted: 21 May 2019
Published online: 06 Aug 2020 *