Effect of service damage on fatigue crack growth behavior of brake disc

被引：0

作者：

Li, Zhiqiang ^{[1
]}

Han, Chen ^{[1
]}

Zhang, Xiaokang ^{[1
]}

Yang, Zhiyong ^{[1
]}

机构：

[1] School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing

来源：

Journal of Railway Science and Engineering | 2024年 / 21卷 / 10期

关键词：

brake disc; crack propagation; performance degradation; residual stress; service damage;

D O I：

10.19713/j.cnki.43-1423/u.T20232110

中图分类号：

学科分类号：

摘要：

The brake disc is an important component of high-speed train braking system. Its complex service conditions cause various forms of service damage to brake disc, which affects its subsequent maintainability and service safety. The brake disc before service and the serviced brake disc with warping deformation and fatigue cracks on the friction surface were selected as the research objects. By testing the tensile mechanical properties of the brake disc material before and after service at different temperatures, a mechanical performance degradation model affected by the depth and temperature on the friction surface was constructed to characterize the damage of the brake disc material. By constructing the three-dimensional transient simulation model of the brake disc under different braking conditions, the structural deformation and residual stress state of the brake disc after service were obtained to represent the structural damage of the brake disc. The fatigue crack growth life of brake disc was analyzed based on the Paris theory, and the influence of service damage on the fatigue crack growth ability of brake disc was evaluated. The results show that the mechanical properties of the brake disc material decline after long-term service. The mechanical properties show a gradient distribution from the surface to the center of the friction surface. The strength of the near-surface material decreases by about 20%. A dish-warping deformation of the disc occurs after the release of the residual stress in the brake disc. Under the effect of the degradation of the mechanical properties of the brake disc after service, the value of stress intensity factor of the crack is significantly higher than that of the brake disc before service. For the crack in the middle of friction surface, the crack growth rate in radial direction is higher than that in the depth direction of brake disc, which makes the depth-to-length ratio of crack shape decrease continuously. Compared with the brake disc before service, the crack growth life for the crack in the middle of the friction surface of the brake disc after service is reduced by 48% when propagating from 0.5 mm to 70 mm. The bolt hole crack mainly propagates in the depth direction at the initial stage. With the increase in crack size, the crack growth rate in the radial and depth direction are gradually consistent for the brake disc after service. Compared with the brake disc before service, the crack growth life for the bolt hole crack of the brake disc after service is reduced by 29% when propagating from 0.5 mm to 50 mm. The research method could be used for the performance characterization and failure analysis of the brake disc with different damage. The research also provides engineering reference for the maintenance and safe service of the brake disc. © 2024, Central South University Press. All rights reserved.

引用

页码：4253 / 4265

页数：12

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