Computer Simulation of Corrosion Fatigue Process Considering Stress Relaxation Due to Initiation and Propagation of Multiple Cracks

概要

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In order to investigate stress relaxation behavior at the specimen surface during the corrosion fatigue process caused by the initiation and propagation of many cracks, rotating bending fatigue tests were carried out in sodium chloride aqueous solution using specimens of 6 and 12 mm diameters. Stress amplitude decreases of about 25～50% were observed during the corrosion fatigue process performed at low stress amplitude. This stress relaxation behavior is well evaluated by calculating the compliance increase of the specimen. Computer simulations of the corrosion fatigue process of the unnotched specimens were conducted. The results showed good agreement with the experimental results. In the simulations, probabilistic crack initiation behavior during the corrosion fatigue process, the stress relaxation effect at the cracked parts and crack coalescences among many distributed cracks are taken into consideration.
社団法人日本機械学会の論文
1992-01-00