Pitting Corrosion and Fatigue Crack Nucleation

摘要: To assess two proposed criteria for the transition from pitting to cracking, corrosion fatigue crack nucleation experiments were conducted on open-hole specimens of 2024-T3 (bare) alloy in a 0.5M NaCI solution at room temperature different loading frequencies, conjunction with coordinated studies and growth (CFCG). The are: (1) stress intensity factor ΔK an equivalent (by modeling pit as semi-elliptical surface crack) equaled or exceeded threshold (ΔK t h ) CFCG, (2) time-based CFCG rate rate. cracks was found be associated large pits. size crack-nucleating pits larger lower frequencies. This frequency dependence reflects competition between CFCG. Validation terms experimental data is presented discussed.