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Strength of Materials

Erschienen in:

01.01.2015

Short Fatigue Crack Growth at Different Maintenance Times for LZ50 Steel

verfasst von: B. Yang, B. Q. Ma, Y. X. Zhao, S. N. Xiao

Erschienen in: Strength of Materials | Ausgabe 1/2015

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Abstract

Based on the average fatigue life of LZ50 axle steel specimens without surface rolling, five maintenance times were determined. Accordingly, five groups of specimens were turned and rolled at above maintenance times and were fatigued using a replica technique. The results show that the crack growth rate is much lower than that before rolling at a given dominant short crack size. The effective short crack density of all specimens decreases significantly after maintenance. However, with the postponement of surface maintenance, the highest effective short crack density for the five studied groups of specimens increases continuously, while the average fatigue life decreases gradually. A maintenance time effect function is presented to refine a short crack growth model described previously. The refined model can include a significant effect of the maintenance time on short crack growth and predict its patterns at different maintenance times with exiting test results for LZ50 axle steel.

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Titel: Short Fatigue Crack Growth at Different Maintenance Times for LZ50 Steel
verfasst von: B. Yang
B. Q. Ma
Y. X. Zhao
S. N. Xiao
Publikationsdatum: 01.01.2015
Verlag: Springer US
Erschienen in: Strength of Materials / Ausgabe 1/2015
Print ISSN: 0039-2316
Elektronische ISSN: 1573-9325
DOI: https://doi.org/10.1007/s11223-015-9636-0

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