Analysis of the fatigue performance of elastic rail clip

Hasap, Anat; Paitekul, Phanasindh; Noraphaiphipaksa, Nitikorn; Kanchanomai, Chaosuan

doi:10.1016/j.engfailanal.2018.05.013

Cited by 40 publications

(33 citation statements)

References 6 publications

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“…The stress amplitude S a and the mean stress S m of each stress cycle are determined. The equivalent stress amplitude S a(R¼À1) when the stress ratio is R ¼ À1 can be obtained by formula (7), and then the fatigue life N corresponding to equivalent stress amplitude S a(R¼À1) . The clip fatigue damage can be calculated by formula (8) via a bogie.…”

Section: Analysis Of the Effects Of Rail Corrugation On The Vibration Fatigue Of Fastener Clipsmentioning

confidence: 99%

“…However, their research did not feature any analysis of the dynamic response and model verification. Hasap et al 7,8 also studied the effects of toe load on the fatigue life of clips, theoretically analyzed the stress distribution using a finite element model, studied the dynamic displacement of clips under normal wheel load and impact wheel load, and carried out fatigue tests at a frequency of 5 Hz based on this displacement. The tests indicated that, when the dynamic displacement of the rail clip was 0.5 mm under a normal wheel load, then the number of cycles was greater than 5 Â 10 6 .…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the fatigue performance of elastic rail clips considering rail corrugation and dynamic axle load

Wang

Lü

Zhao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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To analyze the reasons for rail clip fracture, the characteristics of rail corrugation were first measured using a rail corrugation meter. The vibration acceleration of the fastener clips at the sections with/without rail corrugation was measured, and the effects of rail corrugation on the clip vibration were analyzed. After this, a vehicle--track coupling dynamic model and a refined model for the fastener system were established in order to study the effects of rail corrugation on the vibration acceleration and stress on critical points. Finally, the rail grinding limits were determined based on the fatigue analysis method and the damage accumulation theory from the aspect of the fatigue life of the clip. The results of the study showed that the main wavelength of rail corrugation at the rail clip fracture section was approximately 40 mm. The vibration acceleration of the clip caused by rail corrugation was too large. Under normal installation conditions, the maximum clip stress was 1490 MPa at the small circular arc on the rear arch, which was identical to the on-site fracture location. The intrinsic frequency of the clip was approximately 810 Hz. Rail corrugation excited and triggered the forced vibration of the clip, and induced resonance at a speed of 120 km/h and a wavelength of 40 mm. The large cyclic stress amplitude of the clip with rail corrugation increased from 44 MPa to 68 MPa when compared with the clip without rail corrugation. Rail clip fracture was caused by the naturally occurring resonance fatigue arising from rail corrugation. For metro lines designed with a maximum speed of 120 km/h, it was suggested to control the rail corrugation amplitudes with a wavelength of 40 mm, 50 mm, 30 mm, 120 mm and 160 mm to below 0.04, 0.08, 0.16, 0.19 and 0.2 mm, respectively, taking into account the fatigue life of the clip.

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Section: Analysis Of the Effects Of Rail Corrugation On The Vibration Fatigue Of Fastener Clipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the fatigue performance of elastic rail clips considering rail corrugation and dynamic axle load

Wang

Lü

Zhao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

“…[4][5][6][7] Other similar researches have been conducted to investigate different loading conditions especially for rail clips because that is the critical component of fastening system. 8,9 Fatigue assessment has also been conducted by many researchers to estimate the fatigue life of rail clips. Tamagawa et al 3 developed a fatigue limit diagram for Fast-clip and compared with Fast-clip repeat loading experiments.…”

Section: Introductionmentioning

confidence: 99%

Finite element and experimental study on multiaxial fatigue analysis of rail clip failures

Liu

Tsang

Liu

et al. 2020

Fatigue Fract Eng Mat Struct

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The rail clip fastening system is an important structural component of railway track systems providing flexibility and turnover resistance for running rails. High replacement frequency of fasteners was observed compared with other components because of fatigue failures of rail clips. In this study, implicit and explicit finite element (FE) models were developed for E‐clip and Fast‐clip with material and fatigue properties obtained from experimental testing. The fatigue loading experiments were conducted to determine the strain‐life relationship. The assessments of the fatigue damage and fatigue life were analysed using the FE results for the rail clip strain/stress components with the Fatemi‐Socie multiaxial fatigue criterion. A time‐efficient smallest enclosing circle algorithm was developed to search the critical plane orientation and the maximum shear strain amplitude for fatigue analysis. This work provides a method for FE and experimental study of multiaxial fatigue analysis of rail clip failures subjected to dynamic loading.

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“…e crack initiation life of the elastic rail clips was also analyzed using the rain flow counting method and the Palmgren-Miner linear damage rule. Also, Hasap et al [8,9] analyzed the effects of clamping force and deformation on the fatigue life of the elastic rail clip through fatigue tests and applied the Goodman diagram in evaluating the fatigue performance of elastic rail clips. Xiao et al [10] also established a refined fastener system model and conducted a modal and harmonic response analysis of the fastener system under operation.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Effects of Material Parameters on the Fatigue Performance of Novel Anticorrugation Elastic Rail Clips

Wang

Lü

Zhao

et al. 2020

Shock and Vibration

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A novel elastic rail clip was obtained through size improvement based on the II-type elastic rail clips to solve the fatigue failure of elastic rail clips. The metro vehicle-track coupling model and the fastener system refinement model were developed to analyze the effects of the material (38Si7 and 60Si2Mn) on the static and dynamic responses of the elastic rail clips and their fatigue performances under rail corrugation. According to the results, the elastic rail clip made of 60Si2Mn did not undergo any plastic deformation and exhibited higher strength than that made of 38Si7. Elastic rail clips made of 38Si7 and 60Si2Mn presented a consistent clamping force, natural frequency, and vibration acceleration. However, they were most sensitive to the wavelength of 50 mm. Both materials influenced the small back bending area of the elastic rail clip only. The elastic rail clip made of 60Si2Mn could meet the fatigue life requirements of 5 million times. As for the elastic rail clip made of 38Si7, the corresponding values of corrugation with the wavelength of 50 mm and 40 mm are to be controlled below 0.09 mm and 0.41 mm, respectively. The performance of the elastic rail clips to resist rail corrugation can be improved significantly through the increase in the geometric dimensions and selection of materials with higher strength.

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Analysis of the fatigue performance of elastic rail clip

Cited by 40 publications

References 6 publications

Numerical investigation of the fatigue performance of elastic rail clips considering rail corrugation and dynamic axle load

Numerical investigation of the fatigue performance of elastic rail clips considering rail corrugation and dynamic axle load

Finite element and experimental study on multiaxial fatigue analysis of rail clip failures

Analysis on the Effects of Material Parameters on the Fatigue Performance of Novel Anticorrugation Elastic Rail Clips

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