The Fatigue Behavior and Mechanism of Large FV520B-I Specimens in a Very High Cycle Regime.

Autor: Zhang, Han, Zhao, Ya-Fan, Zhang, Ming, Li, Meng-Li, Liu, Long, Cui, Yu-Liang, Shang, Xian-Dong
Předmět:
Zdroj: Journal of Materials Engineering & Performance; Jan2024, Vol. 33 Issue 2, p950-960, 11p
Abstrakt: We examined the fatigue properties in very high cycle regime of large FV520B-I specimens in an ultrasonic fatigue test. The fatigue mechanism in very high cycle regime did not change and the fatigue properties obviously degraded as the specimen size enlarged. The fatigue life decreased and the S–N curve moved downward due to the increase in inclusion size in large specimens. The maximum inclusion sizes in specimens were predicted by the method of statistics of extreme value. The characteristic area sizes were obtained by experiment, including the distance from the crack origin to the specimen surface, the fish-eye diameter, the GBF diameter, and the inclusion diameter. According to these data, the relationships of characteristic area sizes with VHCF life were analyzed. The prediction of fatigue strength using the modified Murakami model was closer to the test result, and the fitting of fatigue life using the corrosion fatigue crack initiation life model was less effective compared with the fitting of small specimen test results. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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