Experimental study of the fatigue characteristics and reliability of continuous welded rails

Sarikavak, Yasin; Takeuchi, Takaki; Horiuchi, Toshitaka; Goda, Koichi

doi:10.1111/ffe.13219

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Mao et al 14 investigated the motor hangers of high‐speed trains, and multi‐scale fracture analyses indicated that the cracks originated from weld defects and propagated under high amplitude and high frequency vibration. Sarikavak et al 15 conducted four‐point bending fatigue tests on specimens extracted from rail sections and established S–N curves at different load levels. The study delved into the fatigue characteristics and reliability of continuously welded rail specimens formed by flash butt welding technology.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic fatigue evaluation of the equipment cabin of high‐speed trains based on sub‐zone loading method

Xiao,

Liang,

Sun

et al. 2024

Fatigue Fract Eng Mat Struct

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The equipment cabins of high‐speed trains encountered alternating pressure loads during operation. A fatigue evaluation methodology based on sub‐zone aerodynamic loading was proposed. Theoretical model was given between pressure load at each zone and the accompanying six structural stress components. Stress recovery matrix was formulated by finite element analysis (FEA) in sub‐zone loading cases to relate the stress to the measured pressure loads. Vehicle test gathered the pressure time‐history data of cabin sub‐zones at the head car in different ambient conditions, from which the two‐dimensional stress spectrum was derived by rain‐flow counting. The fatigue damage of welds was then assessed utilizing the Miner's and Corten Dolan's rules, yielding maximum equivalent damages of 0.72 and 0.23, respectively. The structural fatigue damage under high environmental wind conditions was 1–3 times greater than in calm weather. Nonetheless, the fatigue damage incurred by the metal matrix was significantly lower, demonstrating a substantial safety margin.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic fatigue evaluation of the equipment cabin of high‐speed trains based on sub‐zone loading method

Xiao,

Liang,

Sun

et al. 2024

Fatigue Fract Eng Mat Struct

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“…Commonly, in metro systems, rails that are 25‐m long are permanently joined together using aluminothermic welding (ATW) or flash‐butt welding (FBW; Sarikavak et al., 2020), and there are still a few insulated joints that function as signaling elements and broken rail detection systems (Mandal, 2016). As of December 2021, the operating mileage of China's metro lines is 7253.73 km, and the number of RWJs can be estimated to be as high as 580,300.…”

Section: Introductionmentioning

confidence: 99%

Profile evaluation of rail joint in a 3‐m wavelength based on unsupervised learning

Cong

Xue

Chen

et al. 2022

Computer aided Civil Eng

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Previously, electronic straightedges with a length of 1 m were widely used to measure the longitudinal profiles of rail joints. However, owing to the lack of an efficient measurement device, rail joints with 3-m wavelengths are seldom studied. In this study, a rail measurement trolley based on the chord-reference method was developed with a measurement wavelength of up to 3 m. A field measurement was performed on a 53-km metro line, and the waveforms of 4340 rail joints were obtained. First, to visualize the distribution of the dataset and to find out the common features, t-distributed stochastic neighbor embedding dimensionality reduction was applied to the rail joint dataset, and each rail joint waveform was mapped to a point in a two-dimensional space. Second, K-means was applied to the rail joint dataset, and six categories of rail joints were obtained.The results indicated that there are two types of rail joints: M-type and W-type, accounting for 18.41% and 76.08% of the total number of joints, respectively, and the remainder are bolted rail joints. Third, to better evaluate rail joint status, the concept of rail joint triangle (RJT) is proposed, and five shape-based features of a rail joint in 3-m wavelength are defined. Finally, using RJT distribution analysis, we observed that the shape-based features provide more essential information about a rail joint, such as symmetry, asymmetry, M-type, or Wtype, compared with conventional indexes such as the quality index. Notably, compared with the waveform of a rail joint at 1 m, a 3-m waveform provides significantly more essential information, which can be meaningful for future research on the dynamic impact of rail joints, as well as profile grinding around

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“…Weld material properties like hardness, microstructure and other physical and mechanical properties show variations between the weld and base metal. 1,2 Heavy haul trains have high traffic volume, high density and long-term dynamic load, leading to the formation of irregularities around welds. This high wheel-rail impact at the weld, causes serious damage to welds, especially in case of thermit welds.…”

Section: Introductionmentioning

confidence: 99%

Field testing and performance optimization of a weld reinforcement device in heavy haul railways

Liu

Xiao

Shi

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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The Bowed plates weld device (BPWD) is a new type of rail weld reinforcement device, which has been widely applied in heavy haul railway lines in China. It changes the service state and vibration characteristics of a weld. In order to explore the BPWD vibration influence on the track, static, and dynamic on-site tests were carried out on a heavy haul line. The vibration influence and spectrum characteristics of the track between BPWD and unplated weld (UW) was compared. At the same time, a 3D coupling model of heavy haul train-rail weld was established and optimization of service performance of the BPWD was carried out. The results showed that the average acceleration of rail, sleeper and ballast at the BPWDwere 52.7%, 43.5%, and 50.2% lower than that of UW. In comparison with UW, peak value of the periodic frequency spectrum and dominant frequency distribution in the BPWD track structure could be effectively reduced from rails to ballast. Length of 0.8 m for plate was found to be optimum in order to reduce the rail stress effectively. The material of the insulating interlayer should preferably be nylon.

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Experimental study of the fatigue characteristics and reliability of continuous welded rails

Cited by 9 publications

References 20 publications

Aerodynamic fatigue evaluation of the equipment cabin of high‐speed trains based on sub‐zone loading method

Aerodynamic fatigue evaluation of the equipment cabin of high‐speed trains based on sub‐zone loading method

Profile evaluation of rail joint in a 3‐m wavelength based on unsupervised learning

Field testing and performance optimization of a weld reinforcement device in heavy haul railways

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