Desenvolvimento de um software educacional para análise de fadiga pelo método da vida sob tensão

Abstract

This work consists of the development and application of a didactic numerical tool for fatigue failure analysis of mechanical components, made of ductile materials subjected to high cycling. This software is developed in the Python language with the GNU Image Ma nipulation Program Toolkit or GIMP Toolkit (GTK) open source toolset to create graphical user interfaces (GUI) for the program. In order to facilitate the development and writing of the code, the aid tool to create intuitive interfaces Glade is used, allowing to generate a source code in .xml for the chosen programming language (in this case, Python). The fatigue analysis methodology is based on the literature in the area, presenting the equations and analytical approaches. From the analysis of loads and stresses acting on the evaluated part, obtained in the initial static analysis as input data of the software, and with the insertion of material and loading data, the user of the program can computationally analyze the results of a dynamic analysis and draw the fatigue failure diagrams according to the most usual criteria in the literature. Two case studies were chosen to verify the proper functioning of the proposed software, one based on Budynas e Nisbett (2019) and the other on Norton (2013). As a result, the first case study, analyzing two examples from that reference, obtained a difference of 0.014% and 0.068% for the determination of the fatigue resistance limit S ′ e and, for the determination of the fatigue failure safety coefficient, using Goodman’s criterion, there were no significant differences up to the second decimal place, according to the same literature. Similar results for the second case study were also obtained. At the end of the development of this work, a functional program was developed, called Fatigue Life Calculator, in which it is able to calculate mechanical fatigue for two different calculation methodologies.