Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
THE INFLUENCE OF SMALL DEFECTS ON THE FATIGUE LIMIT OF 304L STAINLESS STEEL AT ROOM TEMPERATURE
Submission Author:
Artur Dias , DF
Co-Authors:
Artur Dias, Cainã Bemfica de Barros, Fábio Castro
Presenter: Artur Dias
doi://10.26678/ABCM.COBEM2019.COB2019-0905
Abstract
This work investigates the influence of small defects on the fatigue limit of 304L stainless steel. Uniaxial fully reversed force-controlled and torque-controlled fatigue tests were carried out at room temperature in the presence of a cylindrical defect whose square root of area is equal to 400 µm. Fatigue limit obtained from experimental data was 16% greater than the theoretical one obtained from the square root of area parameter model, for both the uniaxial and torsional cases. Nonpropagating cracks were not observed for experiments that did not fail after 2×10^6 cycles. The appearance and growth of fatigue crack were investigated. The cracks initiated close to the point of maximum principal stress at the hole surface, and propagated approximately in the plane perpendicular to the direction of the maximum principal stress.
Keywords
304L stainless steel, small defects, Fatigue Limit, square root of area parameter model
