Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/app11093841
Keywords
fatigue; decarburized layer; tension clamp; quenched and tempered steel; rail fastening system
Categories
Funding
- Incheon National University (International Cooperative) Research Grant [2016-2216]
Ask authors/readers for more resources
In the case of fatigue failure occurring in the tension clamps (SKL 15) of the DFF-300 rail fastening system, measuring the depth of the decarburized layer and assessing fatigue crack initiation based on linear elastic fracture mechanics revealed that one of the tension clamps had a thinner decarburized layer than the manufacturer's maximum allowable depth.
The surface of a quenched and tempered spring steel may have a decarburized layer from which the carbon component has been reduced. The fatigue strength of the decarburized layer is low compared to the base metal, which can easily develop fatigue cracks. Recently, fatigue failure was reported in the tension clamp (SKL 15) of the DFF-300 rail fastening system during use on one urban transit route in South Korea. As a result of measuring the depth of the decarburized layer of the SKL 15 tension clamp where the fatigue failure occurred, a decarburized layer thinner than the manufacturer's maximum allowable decarburized layer was found in one of the eight tension clamps. To check the depth of the decarburized layer where the fatigue crack may have initiated, the decarburized layer was assumed to be the initial crack, and fatigue crack initiation was assessed based on the linear elastic fracture mechanics. The manufacturer's maximum allowable decarburized layer depth of 0.2 mm may result in fatigue cracks.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available