Study on Fatigue_Crack Behavior in Welded Structure of DSS 2205

摘要

The fatigue crack growth behavior of weld metal (WM),heat affected zone (HAZ) and base metal(BM) of Duplex Stainless Steel (DSS) 2205 standard sample was tested in different stress ratios at HF fatigue testing machine.ANSYS analysis software was used to simulate the fatigue crack growth rate of the steel under different stress ratio.Regression equations and da / dK-△K curves of experiment and simulation are compared and analyzed.The results show that the fatigue crack growth rate of WM is slowest and the ability to resist fatigue crack growth is highest among the three parts,the lowest is BM.Secondly,the sensitivity of the rate caused by the stress change of WM is the highest,and the lowest is BM.The simulation of fatigue crack growth rate of DSS 2205 is completely correct and feasible by the experiment.