Load variation of the wheel-mounted brake disc bolts of a high-speed train

Tongbai, Fan; Ren, Zhenwen; Xue, Rui

doi:10.1016/j.engfailanal.2020.105001

Cited by 11 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among them, the frequency was automatically defined by the experimental equipment based on the specimen itself and loading parameters, and the maximum axial excitation load was obtained by multiplying the safety factor 2 by the actual load of the bolt in the brake disc of a high-speed rail. 42 The specimens were numbered P1-P12, and the detailed parameters of the test are given in Table 3.…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…Due to the complicated coupling effects of stress concentration and dynamic fatigue, a variety of factors can influence the formation of the fatigue crack propagation of high- strength bolts, 23 the establishment of an accurate fatigue crack propagation model is thus a key tool for estimating the fatigue life of bolts. In this study, the fatigue crack propagation behavior of high-strength bolts under the coupling action of preload and axial cyclic loading was investigated by experimental and computational methods based on the theory of linear elastic fracture mechanics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation and experimental verification of fatigue crack propagation in high-strength bolts based on fracture mechanics

Zhang,

Li,

Zhao

et al. 2023

Science Progress

View full text Add to dashboard Cite

To investigate the fatigue crack propagation behavior of high-strength bolts for high-speed train brake discs, the fatigue crack propagation of high-strength bolts with initial defects under various load ratios was numerically simulated and experimentally verified based on fracture mechanics in this paper. Firstly, the fracture mechanics model of a three-dimensional hexahedral mesh with initial root defects was established using ABAQUS-FRANC3D interactive technology. Then the stress intensity factor (SIF) of the crack front was calculated by the stress superposition of the crack surface to simulate the coupling effect of preload and axial cyclic load. Based on it, fatigue crack propagation was simulated. Finally, the corresponding fatigue experiments on prefabricated crack bolts were carried out. The results show that mode I cracks dominate in the process of crack propagation. The stable crack propagation zones of the fractured high-strength bolts all show a semi-elliptical cross-section. The SIF of the crack front decreases with the increase of the load ratio, thus making the crack propagation life increase with the increase of the load ratio. The experimental outcomes are in great agreement with the simulation results, which verify that the numerical simulation method can effectively and accurately evaluate the fatigue life of high-strength bolts with initial defects and provides an effective means for predicting the fatigue crack propagation life of the same type high-strength bolts in engineering applications.

show abstract

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental verification of fatigue crack propagation in high-strength bolts based on fracture mechanics

Zhang,

Li,

Zhao

et al. 2023

Science Progress

View full text Add to dashboard Cite

show abstract

“…Zhou Jun-bo [2] independently designed a practical bolt loosening test device, successfully simulated the loosening process of single/double bolt connection structure under shear load, and revealed the important influence of shear load amplitude, preload torque, fitting accuracy and bolt/nut material on the loosening behavior and damage behavior of bolted connection structure. Fan Tong-bai [3] took the wheel-mounted brake disc bolts of high-speed EMUs as the research object, and used theoretical research, finite element analysis and line test to study the reliability of brake disc bolts under the dual action of wheel-rail disturbance and braking, and obtained the variation law of brake disc bolt load and fatigue damage. Xu Yang, et al [4] systematically sorted out and summarized the research results of bolt loosening and fatigue from four aspects: bolt looseness, fatigue, zone fatigue, and loosening and fatigue competition failure.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of the gap elimination connection between a light chassis girder and the subframe

Wang,

Chen,

Zhang

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

View full text Add to dashboard Cite

In order to solve the problem of fatigue failure of the connecting bolts between the integrated subframe and the girder under the continuous high load of the chassis of a light combat vehicle, the rigid strength of the superstructure and the chassis is reduced, which affects the shooting stability. Combined with the structural characteristics of rigid connection between different materials of subframe and beam, the location and cause of bolt failure are analyzed, the " Bolt clearance connection method " is proposed, the finite element calculation model of integrated subframe and girder is established, and the mechanical characteristics of the bolt connection between the original and improved scheme are studied, and the results show that under the continuous high-intensity load of off-road surface, the method can effectively reduce the equivalent force at the bolt joint, and realize the reliable connection between the subframe and the girder in the high and low and lateral directions. Solve the rigid fixing problem of two different materials. It provides a certain reference for the optimization design of light off-road chassis stability.

show abstract

“…During the long-term operation, bolts are prone to looseness due to the variable speeds and loads in the periodic speeding-braking working conditions as well as the dramatic variation of temperature. 1,2 When bolt looseness occurs, the brake disc may run out of the effective braking load and be unable to stop the high-speed train within the effective brake distance, which may cause severe accidents. Therefore, it is of great importance to effectively detect the bolt looseness for the safe operation of high-speed rail.…”

Section: Introductionmentioning

confidence: 99%

Bolt Looseness Detection in Brake Disc of High-Speed Rail Using Wavelet Packet Decomposition and 1D Convolutional Neural Network

Xiao,

Li,

Guan

et al. 2024

The International Journal of Acoustics and Vibration

View full text Add to dashboard Cite

The effective and in-time detection of bolt looseness in the brake disc of high-speed rail is of great significance to ensure the safe operation of the train. The hammer tapping method is one of the most widely used methods for bolt looseness detection. Due to the complex structure of the brake disc, the vibration characteristics associated with bolt looseness are coupled with the transmission path from the head of the bolt through the brake disc to the sensors, which make it difficult to quantitively identify the bolt looseness. In this work, a method based on wavelet packet decomposition and a one-dimensional convolutional neural network (1D CNN) is proposed to quantitively detect the bolt looseness of brake disc. Firstly, the vibration signals collected from the two sensors mounted on the nut side are fused by autocorrelation summation to reduce the influence of transmission path. Secondly, the fused signal is decomposed to sub signals in low frequency and high frequency components by wavelet packet decomposition. The relative difference of wavelet packet energy among sub signals is extracted as the features to enhance the difference among different degrees of looseness. Finally, the 1D CNN model is established and trained by the features of energy relative difference to quantitively identify the bolt looseness. To validate the effectiveness of the proposed method, an experimental platform for bolt looseness detection in brake disc is constructed. Compared with the single-channel 1D CNN and fused signal-1D CNN models, the accuracy of the proposed method is approximately 97%, which confirms the superiority of the proposed method.

show abstract

Load variation of the wheel-mounted brake disc bolts of a high-speed train

Cited by 11 publications

References 19 publications

Numerical simulation and experimental verification of fatigue crack propagation in high-strength bolts based on fracture mechanics

Numerical simulation and experimental verification of fatigue crack propagation in high-strength bolts based on fracture mechanics

Analysis and optimization of the gap elimination connection between a light chassis girder and the subframe

Bolt Looseness Detection in Brake Disc of High-Speed Rail Using Wavelet Packet Decomposition and 1D Convolutional Neural Network

Contact Info

Product

Resources

About