Creep-fatigue reliability modeling and analysis for automotive tubular radiators

doi:10.3969/j.issn.1674-8484.2022.01.016

Abstract

Abstract:

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.

Key words: automotive radiator, creep-fatigue, reliability science principle, cumulative damage, uncertainty

CLC Number:

TB114.3

ZHANG Xiangxiao, YANG Xuanhu, LI Xiaoyang, LI Meijun. Creep-fatigue reliability modeling and analysis for automotive tubular radiators[J]. Journal of Automotive Safety and Energy, 2022, 13(1): 157-167.

Figures/Tables 17

References 28

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热膨胀系数	2.32×10^-5 K^-1
弹性模量	69 GPa
屈服强度	145 MPa
液相线温度	654 ℃

热膨胀系数	2.32×10^-5 K^-1
弹性模量	69 GPa
屈服强度	145 MPa
液相线温度	654 ℃

芯子尺寸	641 mm×419 mm×26 mm
芯体正面面积	0.26 m²
散热管厚度	0.25 mm

芯子尺寸	641 mm×419 mm×26 mm
芯体正面面积	0.26 m²
散热管厚度	0.25 mm

σ_a / MPa	寿命数据N_au
54.2	6 309
52.5	19 953
49.1	63 096
46.8	316 228
44.2	1 000 000
40.6	12 589 254
38.2	199 526 231