Life prediction based on analysis of crack coalescence in low cycle fatigue

✍ Scribed by T. Hoshide; M. Miyahara; T. Inoue

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 820 KB
• Volume: 27
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(87)90007-5

✦ Synopsis

The crack coalescence in some materials is known to make influence on the failure life significantly in low cycle fatigue as well as corrosion fatigue. A model was proposed to simulate crack linking during fatigue process. The crack distribution observed experimentally was idealized by a two-dimensional model with straight cracks. Some assumptions were made for the coalescence criterion in the model. A procedure for estimating residual life was developed based on the proposed model. The procedure was applied to fatigue process of a copper, in which the growth due to crack linkings was observed to be dominant through fatigue life. A good agreement was shown between the experimental and the predicted results. The statistical properties of life distribution were also discussed based on a Monte Carlo simulation.