基于Sehitoglu模型的发动机气缸盖热机疲劳寿命预测  

THERMAL-MECHANICAL FATIGUE PREDICTION OF ENGINE CYLINDER HEAD BASED ON THE SEHITOGLU MODEL

作　　者：邹萍萍 景国玺 曾小春[1] 骆旭薇 袁晓军[1] 魏涛[1] 林宇星[1] ZOU PingPing;JING GuoXi;ZENG XiaoChun;LUO XuWei;YUAN XiaoJun;WEI Tao;LIN YuXing(Powertrain Engineering Department,Jiangling Motors Corporation,Limited,Nanchang 330001,China;School of Mechanical Engineering,Hebei University of Technology,Tianjin 300400,China;Tianjin Key laboratory of Power Transmission and Safety Technology for New Energy Vehicles,Tianjin 300400,China)

机构地区：[1]江铃汽车股份有限公司动力总成开发部,南昌330001 [2]河北工业大学机械工程学院,天津300400 [3]天津市新能源汽车动力传动与安全技术重点实验室,天津300400

出　　处：《机械强度》2021年第5期1184-1190,共7页Journal of Mechanical Strength

基　　金：国防科技重点实验室基金项目(6142212190307)资助。

摘　　要：以某发动机气缸盖为研究对象,开展了气缸盖本体材料力学性能测试与表征、气缸盖热机疲劳寿命预测研究工作。采用流固耦合方法,获得了准确的气缸盖热边界和温度场结果,温度场计算值与实测结果相符合。依照整机热冲击试验规范,采用Sehitoglu模型对缸盖的热机疲劳寿命进行了预测,仿真结果显示,缸盖最低寿命出现在第二缸火力面排气侧鼻梁区,主要由环境损伤引起,最低寿命为6860次,满足设计要求,该气缸盖顺利通过整机热机疲劳台架试验考核。The research work was carried out on the mechanical performance testing and characterization of an engine cylinder head material,and the prediction of the cylinder head thermal engine fatigue life.The fluid-solid coupling method was used to obtain accurate results of the thermal boundary and temperature field of the cylinder head.The calculated temperature field is consistent with the measured results.According to the thermal shock test specifications of the whole machine,the Sehitoglu model was used to predict the thermal fatigue life of the cylinder head.The simulation results show that the minimum life of the cylinder head occurs in the nose bridge area on the exhaust side of the second cylinder fire surface,which is mainly caused by environmental damage.The service life is 6860,which meets the design requirements.At the same time,the cylinder head has successfully passed the heat engine fatigue bench test of the whole machine.

关 键 词：发动机 气缸盖 热机疲劳 寿命预测 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]