Influence of Rail Joint Defects on the Running Impact Coefficient and Fatigue Residual Life of Crane

doi:10.3901/JME.2020.14.254

Abstract

Abstract: In order to study the influence of impact coefficient of rail defects on crane operation, the unevenness function caused by step defects and gap defects is simulated by sine and cosine functions respectively, and the crane dynamics model of the running process under the rail defects is proposed. The expression of the impact coefficient of crane operation under step defects and gap defects is derived. The feasibility of the calculation results is verified by comparison with GB/T 3811:2008 and ISO 8686—1:2012. Based on the structural parameters and the characteristics of the rail defects, the critical conditions for the coupling of step defects and gap defects are analyzed. The results show that step defects play a major role in the impact process, and the gap defects can be ignored when both of them exist at the same time. The strain time history of the most dangerous point of the main beam without rail defect and 7 mm step defect under full load is tested respectively, and the maximum stress of the dangerous point is calculated. The theoretical calculation of running impact coefficient is applied to the finite element model to calculate the maximum stress value of corresponding measuring point under two different situations. The error between the finite element model and the experimental results is 2.63%, which verifies the correctness of the theoretical calculation. Analysis of the influence of rail defects on the remaining life of the crane can be found as follows: the critical crack length and fatigue residual life of the crane decrease with the increase of rail step defect, and the influence degree increases with the increase of rail defect. The increase of the step defects of the rail will increase the impact coefficient and reduce the remaining life of the main girder of the crane.

Key words: crane, running impact coefficient, rail joint defects, experimental verification, fatigue residual life

CLC Number:

TH21

XIN Yunsheng, DONG Qing, XU Gening. Influence of Rail Joint Defects on the Running Impact Coefficient and Fatigue Residual Life of Crane[J]. Journal of Mechanical Engineering, 2020, 56(14): 254-264.

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