Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Experimental Study of the Influence of Small Defects on Fatigue Life in Low Carbon Steel
Submission Author:
Natalia Gonçalves Torres , DF
Co-Authors:
Natalia Gonçalves Torres, Edgar Mamiya
Presenter: Natalia Gonçalves Torres
doi://10.26678/ABCM.COBEM2019.COB2019-0399
Abstract
This work investigates the effects of small defects in fatigue life on SAE 1020 low carbon steel. For this, the experimental program developed consists of a set of uniaxial fatigue tests in smooth specimens and specimens with three types of defects - cylindrical defect Ø0.42 mm, cylindrical defect Ø0.75 mm and cylindrical shallow defect - in order to obtain S-N curves for each case. Based on the results obtained in these analyzes, it was observed that when change any small defects characteristics - size and depth – the fatigue life is significantly affected. The specimens with defects Ø0.42 mm showed less influence, reducing the fatigue life of material between 48% and 60% in relation to smooth specimens. In general, for lower stress amplitudes, the effects of the small defects are correspondingly larger, for all analyzed cases.
Keywords
small defects, low carbon steel, life estimation
