Fatigue crack growth behavior of surface crack in rails

Seo, Jung-Won; Kwon, Seok-Jin; Jun, Hynukyu; Lee, Dong-Hyeong

doi:10.1016/j.proeng.2010.03.093

Cited by 33 publications

(19 citation statements)

References 8 publications

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“…Fatigue crack propagation modeling with fatigue life prediction analysis based on fracture mechanics analysis of specific crack growth geometries is one useful method. This method is usually applied by considering quasi‐static loading and boundary conditions, as well as selecting different initial crack sizes, shapes, and crack front orientation based on the physical observations or measurements from actual fractured cases …”

Section: Introductionmentioning

confidence: 99%

“…This method is usually applied by considering quasi-static loading and boundary conditions, as well as selecting different initial crack sizes, shapes, and crack front orientation based on the physical observations or measurements from actual fractured cases. [13][14][15][16] Another method is to explore a fatigue initiation analysis approach if the complex dynamic stress applied by the train wheel on the rail steel can be simulated employing 3D dynamic finite element analysis methodology. The railway track system comprises a continuous welded rail mounted with rail clips on sleepers (wooden or concrete) integrated to a track form system.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic finite element modeling and fatigue damage analysis of thermite welds

Liu

Shi

Tsang

et al. 2019

Fatigue Fract Eng Mat Struct

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Railway track comprises of continuous welded rail mounted with rail clips on sleepers integrated to a ballast track form system. Modeling the rail structure with thermite weld subjected to the complex dynamic loadings is a challenging problem. Fatigue failures at the head‐to‐web, web‐to‐foot, and foot regions of weld collar are investigated. In this paper, a combined method of multibody system dynamic analysis and dynamic finite element analysis was used. A train roll‐in experiment was conducted at a train depot test track to validate modeling results predicted at the strain gauge location. Three critical plane‐based multiaxial fatigue criterions incorporated with a smallest enclosing circle algorithm were implemented in Python code to study the fatigue behavior at weld collar. Parametric studies were also conducted to investigate the effects of track component materials, track curvature, and train velocity. This approach provides a method for predicting the failures of thermite welded joints in railway tracks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic finite element modeling and fatigue damage analysis of thermite welds

Liu

Shi

Tsang

et al. 2019

Fatigue Fract Eng Mat Struct

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“…Many researches about the growth path of the wheel/rail contact fatigue have been reported. The review by Smith et al [2,4] indicated that there was an acute angle between the crack initiation and the direction of train running during the initial stage, and the growth angle increased with the increase of the depth, and, finally, the rail fractured in the direction perpendicular to the surface, as shown in Figure 1(a). Chen et al [5] studied the spalling path of the rail head through slice analysis and concluded that when the cracks grew to a certain depth, they would change their propagation direction and then spread approximately along the right-about with train running direction towards the rail surface; consequently, spalling was formed in the shape of barb, as shown in Figure 1(b).…”

Section: Introductionmentioning

confidence: 99%

“…As for the crack propagation mechanism, Ringsberg et al [17][18][19] studied the microcracks propagation mechanism of the rail surface based on the Hertz theory and the wheel/rail tribology and found that the propagation of microcracks on surface was mainly open mode. With regard to the long cracks, Seo et al [4,20,21] investigated that sliding propagation was their major mode, and their propagation rate increased as the friction coefficient between the wheel and the rail increased.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Spalling Defect on Rail Surface under Rolling Contact Conditions

Yang

Cao

Kang

et al. 2018

Mathematical Problems in Engineering

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Under the wheel/rail contact loading conditions, the microcracks on the rail surface propagate, leading to spalling defect or rail fracture and threatening the travelling safety of high-speed railway directly. In order to analyze the mechanism of the crack propagation on the rail surface, the calculation model of the wheel/rail contact fatigue was established, and the variation of the stress intensity factor at the crack tip when the crack length was increased from 0.1 mm to 2 mm was obtained. Based on the mixed-mode fracture criterion and Paris growth theory, the mechanism of the crack propagation on the rail surface was analyzed. The results show that when the microcrack grows to macrocrack, the mode of the fatigue crack on the rail surface is mixed including sliding mode and open mode. With the increase of the crack length, the stress intensity factor KI increases first and then decreases gradually, and the relative dangerous location of the open-mode crack moves from the inner edge of the contact area to the outer edge, while the factor KII is increasing during the whole propagation process, and the relative dangerous location of the sliding-mode crack remains unchanged basically. The main failure mode of crack is open during the initial stage and then transforms into sliding mode with the crack length increasing. The crack tends to propagate upward and leads to spalling defect when the crack length is between 0.3 and 0.5 mm. This propagation path is basically identical with the spalling path of the service rail. The research results will provide a basis for improving the antifatigue performance of rail and establishing the grinding procedure.

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“…Crack growth under RCF with a linear elastic fracture mechanics (LEFM) approach (Franklin et al, 2011;Hannes and Alfredsson, 2012) are of great concern in rail life study. There have been a number of investigations that focused on determining the stress intensity factors (SIF) for cracks subjected to RCF (Liu and Hamada, 2011;Seo et al, 2010), which could be a very clear index to show rail crack growth behavior.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crack Geometric Properties on Its Propagation Tendency of Rail Surface Crack under Rolling Contact Fatigue for the Port Machines

Shen

2015

Journal of Coastal Research

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Liu, Y. and Shen, Y., 2015. Influence of crack geometric properties on its propagation tendency of rail surface crack under rolling contact fatigue for the port machines. 0749-0208.With the development of the loading capacity of the port machines, rail cracks have become a safety problem during operation. As rail cracks' geometric properties change, load distribution is rearranged at the crack tips, which affects the propagation tendency of the crack. In this study, simulations of rail surface crack growth under rolling contact fatigue (RCF) were presented based on a 3D finite element model. More specifically, the focus was on the calculation of the stress intensity factors at the crack tip fronts of short surface crack as well as the variation of the crack geometric properties such as the crack's size, inclination angle and shape, etc. The results showed that with the increase of the crack size, the propagation rate increases to a maximum and then decreases when the crack extends away from the domination of RCF loadings. Moreover, with the increase of the crack inclined angle, the crack propagation rate decreases, but this is only true when the crack size is small. Under RCF, the propagation rate at the rail surface in lateral direction was higher than that at the deepest crack tip, which leads the crack to develop from semi-circular into semi-elliptical, and the propagation rate of semi-elliptical crack is higher than the semi-circular one with the same crack size.

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Fatigue crack growth behavior of surface crack in rails

Cited by 33 publications

References 8 publications

Dynamic finite element modeling and fatigue damage analysis of thermite welds

Dynamic finite element modeling and fatigue damage analysis of thermite welds

Mechanism Analysis of Spalling Defect on Rail Surface under Rolling Contact Conditions

Influence of Crack Geometric Properties on Its Propagation Tendency of Rail Surface Crack under Rolling Contact Fatigue for the Port Machines

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