The effect of braking energy on the fatigue crack propagation in railway brake discs

Li, Zhiqiang; Han, Jingtao; Yang, Zebin; Pan, Like

doi:10.1016/j.engfailanal.2014.05.022

Cited by 58 publications

(28 citation statements)

References 14 publications

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“…[22][23][24] If that is above the threshold value, cracks were observed. [25][26][27] The temperature investigation will help predict the speed threshold value for crack initiation of the disc.…”

Section: Introductionmentioning

confidence: 99%

Temperature evolution of the train brake disc during high-speed braking

Wang

Han

Liu

et al. 2019

Advances in Mechanical Engineering

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Temperature evolution of the train brake disc during high-speed braking was investigated using in situ experiments, theoretical analysis, and finite element modeling. The experimental results show that the temperature distribution on the friction surface experienced the formation of a hot ring first, then expansion and duration of the hot ring. Alternative hot spot and cold zone were observed on the friction surface, which is attributed to the local contact in the friction couple and heterogeneous heat dissipation condition in the disc. The corresponding maximum temperature in the disc increased rapidly first, kept stable then, and decrease slowly in the end. The one-dimensional heat conduction equation was applied to predict the maximum temperature variation and was found to be in agreement with the experimental results. Furthermore, the maximum temperature evolution and the temperature distribution of the disc at the braking time of 45 s were simulated by the finite element method, which is satisfactory. In additional, the temperature variation caused the corresponding fluctuation of instantaneous frictional coefficient and thermal stress distribution in the disc, which results in the thermal damages.

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Section: Introductionmentioning

confidence: 99%

Temperature evolution of the train brake disc during high-speed braking

Wang

Han

Liu

et al. 2019

Advances in Mechanical Engineering

Self Cite

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“…Brake discs are important components of trains, and they mainly fail due to thermal fatigue cracks [2][3][4]. Analyzing the condition of railway train brake discs suggests that their surfaces experienced significant pressures and friction, and they often operate in hot/cold alternating environments due to frequent braking which generates large thermal stresses [5]. When the stress exceeds the limit of the material strength, thermal fatigue cracks appear and expand on the disc surface, leading to the failure and discarding of brake discs and huge wastes of resources [6].…”

Section: Introductionmentioning

confidence: 99%

Bionic Repair of Thermal Fatigue Cracks in Ductile Iron by Laser Melting with Different Laser Parameters

Zhou

et al. 2020

Metals

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Nodular iron brake discs typically fail due to serious thermal fatigue cracking, and the presence of graphite complicates the repair of crack defects in ductile iron. This study presents a novel method for remanufacturing ductile iron brake discs based on coupled bionics to repair thermal fatigue cracks discontinuously using bio-inspired crack blocking units fabricated by laser remelting at various laser energy inputs. Then, the ultimate tensile force and thermal fatigue crack resistance of the obtained units were tested. The microhardness, microstructure, and phases of the units were characterized using a digital microhardness meter, optical microscopy, scanning electron microscopy, and X-ray diffraction. It was found that the units without defects positively impacted both the thermal fatigue resistance and tensile strength. The unit fabricated at a laser energy of 165.6 − 15 + 19 J/ mm 2 had sufficient depth to fully close the crack, and exhibited superior anti-cracking and tensile properties. When the unit distance is 3 mm, the sample has excellent thermal fatigue resistance. In addition, the anti-crack mechanism of the units was analysed.

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“…In addition, Li analyzed the growth of cracks through fracture tests [30]. Korea Railroad Corporation (KORAIL) suggested a method of regenerating the disc crack using the tungsten inert gas (TIG) welding technique [15].…”

Section: Introductionmentioning

confidence: 99%

A Study on Depth Sizing for Surface Cracks in KTX Brake Disc Using Rayleigh Wave

Yeom

Kim

et al. 2019

Advances in Materials Science and Engineering

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Korea Train eXpress (KTX), high-speed railway system, provides an important platform for public transportation and connects major metropolitans in Korea. KTX aiming towards next-generation transportation system has plans to increase the operation times. However, with increasing operation times, safety and reliability of the railways especially inspection of brakes systems becomes important. erefore, in this study, a KTX brake disc inspection system using the Rayleigh wave is developed to characterize the cracks in the discs. e performance of the inspection system is evaluated on the KTX brake discs specimen having fabricated cracks as well as natural cracks. e result shows that the proposed algorithm successfully characterizes the crack types and estimated the length, width, depths and gap between cracks with good accuracy.

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The effect of braking energy on the fatigue crack propagation in railway brake discs

Cited by 58 publications

References 14 publications

Temperature evolution of the train brake disc during high-speed braking

Temperature evolution of the train brake disc during high-speed braking

Bionic Repair of Thermal Fatigue Cracks in Ductile Iron by Laser Melting with Different Laser Parameters

A Study on Depth Sizing for Surface Cracks in KTX Brake Disc Using Rayleigh Wave

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