Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Fatigue assessment in Frequency domain of Gaussian stress-time histories with varying irregularity factor
Submission Author:
Thiago Nogueira dos Santos , RJ
Co-Authors:
Thiago Nogueira dos Santos, Jorge Alberto Rodriguez Duran, Juliano Carvalho da Silva Filho
Presenter: Thiago Nogueira dos Santos
doi://10.26678/ABCM.COBEM2021.COB2021-0656
Abstract
This paper is dedicated to the study of fatigue of materials through frequency domain-based methods to estimate life of Gaussian stress-time history. Dealing with random processes in time domain, the Rainflow method is considered the most suitable for cycle counting, however this method requires a history of stress with a high final time to obtain better results. For this reason, a comparison between frequency domain-based methods seen in specialized literature was made, since the computational cost for these methods is lower than by Rainflow method. Four frequency domain-based methods and a time domain-based method were used in comparison. Proximity results for all four stress histories were observed. It was possible to notice that the selected methods in frequency domain provided conservative results in general, obtaining varied errors related to number of cycles when comparing with Rainflow Method as the irregularity factor is changed.
Keywords
fatigue, rainflow, life estimation, frequency domain
