Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
The generalization and analysis of the Stüssi model for several fatigue damage parameters
Submission Author:
Diogo Karmouche , SP
Co-Authors:
Diogo Karmouche, José António Fonseca de Oliveira Correia, Aparecido Carlos Goncalves
Presenter: Diogo Karmouche
doi://10.26678/ABCM.COBEM2023.COB2023-1122
Abstract
In structures subject to cyclic stresses, mechanical failures, and damage cause unacceptable losses in performance, resulting in unexpected stops and corrective maintenance, which increase the cost of maintenance and reduce the reliability of the structures or components. In this situation, the fatigue life prediction of these structures, both for low and high cycle fatigue, is indispensable, especially if the element is subject to cracks or the effects of mean stress. The non-linear function proposed by Stussi is a geometrical approach for stress fatigue cycles. However, the analysis of only the stress parameter may not consider the effects of mean stress or crack initiation, which parameters such as Smith-Watson-Topper and strain includes. Because of this, this study proposes the generalization of the Stussi model for different fatigue damage parameters, such as stress, deformation, and the Smith-Watson-Topper parameter. This study uses the fatigue data of several steels. And with the experimental data, we compared the results with the conventional models for the damage parameters and with another generalized model. The generalization of the models shows good predictions to the materials in our study for the high and low-cycle regions.
Keywords
fatigue, Stussi model, Full-life, Model generalization
