高镍铸铁排气歧管低周热疲劳研究
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摘要
针对某新开发的车用高镍铸铁排气歧管进行了低周热疲劳寿命预测研究,为获取准确的热边界条件,采用STAR-CCM+与有限元软件进行基于疲劳寿命试验条件的非稳态耦合传热分析,得到了排气歧管的对流换热系数和温度场,建立了具有真实装配关系并施加螺栓预紧力的排气歧管有限元模型,在对等效塑性应变分析的基础上,结合Coffin-Manson公式进行寿命预测。结果表明,在排气歧管开发过程中,采用该方法可以快速对其热疲劳寿命进行评估。
The low cycle thermal fatigue life of a newly developed high nickel cast iron exhaust manifold for vehicle was predicted. In order to obtain a more accurate thermal boundary condition,STAR-CCM + and FE software were applied to analyze non-steady coupled heat transfer based on fatigue life experiment. The convective heat transfer coefficient and temperature field of exhaust manifold were then obtained. The FE model of the exhaust manifold was established with accurate assembly relation among different components and bolt pre-tightening loads. At last,using Coffin-Manson equation,life prediction was completed based on analysis of equivalent plastic strain. The result indicates that the analysis method could speed up thermal fatigue life prediction of an exhaust manifold during developing process.
The low cycle thermal fatigue life of a newly developed high nickel cast iron exhaust manifold for vehicle was predicted. In order to obtain a more accurate thermal boundary condition,STAR-CCM + and FE software were applied to analyze non-steady coupled heat transfer based on fatigue life experiment. The convective heat transfer coefficient and temperature field of exhaust manifold were then obtained. The FE model of the exhaust manifold was established with accurate assembly relation among different components and bolt pre-tightening loads. At last,using Coffin-Manson equation,life prediction was completed based on analysis of equivalent plastic strain. The result indicates that the analysis method could speed up thermal fatigue life prediction of an exhaust manifold during developing process.
引文
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[2]杨晓.CFD_FEA耦合计算分析发动机排气歧管热负荷[J].装备制造技术,2010(10):42-43.
[3]孙立旺.基于直接流固耦合的发动机排气歧管热应力分析[J].河南农业大学学报,2012,46(1):81-84.
[4]张强.换热管流固耦合传热的分区求解数值算法[J].科学技术与工程,2010,28(10):6907-6911.
[5]陶文铨.数值传热学[M].西安:西安交通大学出版社,2001:481-488.
[6]李斌.基于流固耦合的发动机冷却水套-缸体传热研究[D].长沙:湖南大学图书馆,2012.
[7]殷之平.结构疲劳与断裂[M].西安:西北工业大学出版社,2012:7-58.
[8]NAOHISA M.Thermal fatigue life of exhaust manifolds predicted by simulation[R].SAE 2002-01-0854,2002.
[9]徐灏.疲劳强度设计[M].北京:机械工业出版社,1981:378-384.
[10]庄茁.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009:170-174.
[11]郭乙木.线性与非线性有限元及其应用[M].北京:机械工业出版社,2005:247-261.
[12]阮宝湘.螺栓的拧紧力矩系数[J].工程力学,1985,2(2):132-137.