Short Fatigue Crack Growth at Different Maintenance Times for LZ50 Steel

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...

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Bibliographic Details
Published in:Strength of materials 2015-01, Vol.47 (1), p.114-121
Main Authors: Yang, B., Ma, B. Q., Zhao, Y. X., Xiao, S. N.
Format: Article
Language:English
Subjects:
Axles
Carbon steels
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack propagation
Density
Fatigue
Fatigue life
Fatigue testing machines
Maintenance
Materials
Materials Science
Mathematical models
Medium carbon steels
Short cracks
Solid Mechanics
Steels
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Summary: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.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-015-9636-0