汽车管带式散热器蠕变- 疲劳确信可靠性的建模与分析

A creep-fatigue reliability modeling and an analysis method were proposed for automobile engine tubular belt radiators based on the reliability science principle and the uncertainty theory to analyze the radiator reliability for the radiators' design, manufacture, operation and maintenance. Key failure mechanisms and performance parameters were determined based on functional performances and failure analysis, with constructing the causal relationship between key performance parameters, and their physical attributes, external conditions, time and failure criteria to quantify the uncertainty by using the uncertainty theory and the reliability model. An AA3003 aluminum alloy radiator was used to verify the proposed method, when the variation coefficient of external conditions is reduced to 5%, the radiator reliability increases by 0.1. The results show that the method describes the causal law and the uncertainty effect on the automotive radiator reliability, in addition, reducing the variation coefficient of external conditions improves the radiator reliability.