Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
CHARACTERIZATION OF MULTIAXIAL LOW CYCLE FATIGUE PROPERTIES OF SAE 1020 STEEL AND 6351-T6 ALUMINUM ALLOYS
Submission Author:
Thiago Cunha , RJ
Co-Authors:
Thiago Cunha, Jaime T P Castro, Marco Antonio Meggiolaro
Presenter: Thiago Cunha
doi://10.26678/ABCM.COBEM2019.COB2019-1854
Abstract
A simplified method to estimate shear (gammaN) fatigue properties via displacement-controlled experiments is proposed, and used for characterization of SAE 1020 Steel and 6351-T6 Aluminum alloys. This data is compared with the also measured tensile (epsilonN) fatigue properties to identify if these materials are tensile or shear sensitive under multiaxial loading conditions. The Levenberg-Marquardt algorithm is used to optimize the fitting of the experimental data into the Coffin-Manson and in the gammaN equations, and its implementation procedures are discussed. Finally, the most suitable critical-plane multiaxial fatigue models are proposed for each material tested, based on the measured data.
Keywords
low-cycle fatigue, multiaxial fatigue, critical plane damage model, Levenberg-Marquardt Algorithm
