Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures
Dislocation structures can be directly related to the fatigue properties of metals, such as fatigue strength, including the fatigue limit and saturation stress. We present an indirect dislocation-structure-based method to evaluate the local stresses for an in-depth analysis of sleeper screw failures...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/4/656 |
| _version_ | 1797605862030704640 |
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| author | Kang Lin Lichu Zhou Dorte Juul Jensen Xiaodan Zhang |
| author_facet | Kang Lin Lichu Zhou Dorte Juul Jensen Xiaodan Zhang |
| author_sort | Kang Lin |
| collection | DOAJ |
| description | Dislocation structures can be directly related to the fatigue properties of metals, such as fatigue strength, including the fatigue limit and saturation stress. We present an indirect dislocation-structure-based method to evaluate the local stresses for an in-depth analysis of sleeper screw failures, as there is little knowledge about the load and local stresses related to these failures. The sleeper screw, fastening baseplates of rails to sleepers, is a small but critical component in the railway. High loads from passing trains are transferred to the screws, leading to cyclic straining. In the present study, three stress-level tension fatigue experiments are designed in the constant stress mode at a stress ratio R = 0 and a testing frequency of 10 Hz. The microstructures in the failed specimens are characterized and compared with those close to the fracture surface of screws that failed in the field. The dislocation structure similarities and differences are analyzed, and the potential of the proposed methodology is discussed. |
| first_indexed | 2024-03-11T05:07:05Z |
| format | Article |
| id | doaj.art-825af526cac14fa3a9f4f16f6f3eb0f9 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-11T05:07:05Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-825af526cac14fa3a9f4f16f6f3eb0f92023-11-17T18:51:37ZengMDPI AGCrystals2073-43522023-04-0113465610.3390/cryst13040656Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw FailuresKang Lin0Lichu Zhou1Dorte Juul Jensen2Xiaodan Zhang3Department of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, DenmarkDepartment of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, DenmarkDislocation structures can be directly related to the fatigue properties of metals, such as fatigue strength, including the fatigue limit and saturation stress. We present an indirect dislocation-structure-based method to evaluate the local stresses for an in-depth analysis of sleeper screw failures, as there is little knowledge about the load and local stresses related to these failures. The sleeper screw, fastening baseplates of rails to sleepers, is a small but critical component in the railway. High loads from passing trains are transferred to the screws, leading to cyclic straining. In the present study, three stress-level tension fatigue experiments are designed in the constant stress mode at a stress ratio R = 0 and a testing frequency of 10 Hz. The microstructures in the failed specimens are characterized and compared with those close to the fracture surface of screws that failed in the field. The dislocation structure similarities and differences are analyzed, and the potential of the proposed methodology is discussed.https://www.mdpi.com/2073-4352/13/4/656dislocation structuredislocation mechanismsferrite-pearlite dual-phase steelrail screwfatiguefailure |
| spellingShingle | Kang Lin Lichu Zhou Dorte Juul Jensen Xiaodan Zhang Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures Crystals dislocation structure dislocation mechanisms ferrite-pearlite dual-phase steel rail screw fatigue failure |
| title | Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures |
| title_full | Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures |
| title_fullStr | Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures |
| title_full_unstemmed | Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures |
| title_short | Dislocation Mechanisms and Local Strength with a View towards Sleeper Screw Failures |
| title_sort | dislocation mechanisms and local strength with a view towards sleeper screw failures |
| topic | dislocation structure dislocation mechanisms ferrite-pearlite dual-phase steel rail screw fatigue failure |
| url | https://www.mdpi.com/2073-4352/13/4/656 |
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