Research on Coupled Extension Characteristic of Thermal Fatigue Cracks at Forged Brake Disc for High Speed Train

doi:10.3901/JME.2016.10.126

Abstract

Abstract: According to the profile of brake disc crack macro-morphology, the main forms of long crack are approximately its own expansion and multiple cracks connectivity. Regarding the brake disk typical conditions during operation, the circumferential residual stress are considerable by calculated the thermal stress in 300 km/h emergency braking using the finite element method. Thereafter, the thermal fatigue crack growth of brake disc is drove through circumferential residual stress. Based on the conclusion, the brake disc grid with crack is established, and then the distribution of the stress intensity factor and the coupled propagation law between multi-cracks in the crack propagation process are researched. The results show that, the stress intensity factor of crack tip have regularity for different initial crack size and the crack shape tends to flatten with crack propagation under same load; When multiple crack are propagated, crack spacing smaller, the faster expansion and the interaction are more obvious; however, considering the structure and size limits, the more the number of cracks, the smaller the stress intensity factor when crack extended to critical value.

Key words: brake disc, coupling expansion, high speed train, residual stress, stress intensity factor, thermal fatigue crack

CLC Number:

U270

SHI Xiaoling, LI Qiang, SONG Zhanxun, YANG Guangxue. Research on Coupled Extension Characteristic of Thermal Fatigue Cracks at Forged Brake Disc for High Speed Train[J]. Journal of Mechanical Engineering, 2016, 52(10): 126-132.

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