CAJ | 학술논문

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。
침대모신개발적차용고얼주철배기기관진행료저주열피로수명예측연구，위획취준학적열변계조건，채용STAR-CCM＋여유한원연건진행기우피로수명시험조건적비은태우합전열분석，득도료배기기관적대류환열계수화온도장，건립료구유진실장배관계병시가라전예긴력적배기기관유한원모형，재대등효소성응변분석적기출상，결합Coffin-Manson공식진행수명예측。결과표명，재배기기관개발과정중，채용해방법가이쾌속대기열피로수명진행평고。
The low cycle thermal fatigue life of a newly developed high nickel cast iron exhaust manifold for vehicle was pre -dicted.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 a-mong 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 .