Análise do efeito da tensão média sobre a resistência à fadiga do aço ASTM A743 CA6NM
This report regards the influence of the mean stress on the fatigue fracture of an ASTM A743 CA6NM, done by Silva et al (2009). In this report, it‟s shown the historical review of the fatigue studies, followed by the analysis of the experiments promoted by Silva for the following load ratios: R=1, R=2/3, R=1/3 and R=0. More data is obtained and shown in this report by some uniaxial fatigue experiments for load ratios of R=-2/3 and R=1/3. From the results previously achieved by Silva and those acquired in the experiments that took place in this report, it was possible to specify the S-N curve and determine the fatigue limits for this material and for the load ratios experimented. Moreover, an analysis took place in order to compare the obtained results with the theory for uniaxial fatigue from Goodman, Gerber, Walker and Kwofie, among which, the Walker criteria presented the closest results to the experimental ones