Abstract
Reliability prediction of the brake pads is indispensable to guarantee their safety. In the paper, the fatigue reliability of brake pads is analyzed by dynamic stress-strength interference (SSI) model considering strength degradation. Firstly, reliability model of the brake pads was established based on stress-strength interference model considering the influence of impact load. Then reliability of the brake pads was predicted under different impact load frequency and initial strength. Finally, the influence of random degradation strength on reliability was studied by contrast. The analysis results show that random strength degradation, impact load and initial strength have great influence on reliability prediction for the brake pads. Therefore, the reliability prediction of the brake pads fatigue strength considering strength degradation is more in line with the actual situation and the calculation accuracy is higher.
Highlights
As an important guarantee device for the safe operation of vehicles, the performance of vehicle brake directly affects the reliable operation of vehicles and the safety of drivers
The results showed that this method can obtain all the factors and weak links of the brake system and provide theoretical basis for the maintenance and fault diagnosis [11]
To evaluate the fatigue reliability of rotor components, reliability model comined with high and low cycle fatigue loadings was developed on the basis of the stress-strength interference (SSI) method considering the strength degeneration by Yue et al In this method, low frequency fatigue load, high frequency fatigue load and residual strength were taken as random variables
Summary
As an important guarantee device for the safe operation of vehicles, the performance of vehicle brake directly affects the reliable operation of vehicles and the safety of drivers. Noortwijk et al used gamma process to express the strength attenuation, while poisson process was applied to represent the fluctuating load.The dynamic SSI model varying with time was established [23]. To evaluate the fatigue reliability of rotor components, reliability model comined with high and low cycle fatigue loadings was developed on the basis of the SSI method considering the strength degeneration by Yue et al In this method, low frequency fatigue load, high frequency fatigue load and residual strength were taken as random variables. Dynamic SSI model will be used to predict the reliability of brake pads considering the effect of strength degradation and impact load in this paper.
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