Analysis of the axial load of bolts of wheel-mounted brake discs of high-speed trains. (July 2022)

• Record Type: Journal Article
• Authors: Qu, Junsheng; Wang, Wenjing; Wang, Binjie; Li, Guoshun; Jiao, Biaoqiang
• Is Part Of: Engineering failure analysis. Volume 137(2022)
• Publication Date: 2022-07
• Subjects: High-speed train -- Wheel-mounted brake disc -- Axial load -- Bolt; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2022.106250
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: Brake disc's temperature rise increases with increasing initial speed of emergency braking. The maximum load of bolt appears in the condition with an initial braking speed of 280 km/h. The bolt enters the material yield during braking with an initial speed of 280 km/h. The variation range of the axial load of the bolt decreases and becomes stable with increasing braking cycles. Bolt load can be reduced by changing material properties. Abstract: In this paper, the axial load of bolts connected to the brake disc under emergency braking conditions with different initial speeds was tested by a 1:1 bench test. A finite element model was established to analyze the evolution law of the bolts' axial load in the braking process in detail. The results show that the axial load variation range of bolts of the bench test first increased and then decreased with the increase of emergency braking initial speed. The maximum load value (59.4 kN) appeared under emergency braking conditions with an initial speed of 280 km/h. The variation range of the bolts' axial load of the simulation was 55.5 kN, and the error was 7% compared with the test. The influence of material changes of disc and bolt on bolts' axial load in the braking process was summarized, thus providing a reference for the material selection of bolt and disc.