基于瞬态响应分析的汽车前舱盖开关疲劳寿命预测  

Opening and closing fatigue life prediction of automotive hood based on transient response analysis

作　　者：张岩[1] 孟凡亮[1] 吴泽勋[1] 王昌胜[1] 

机构地区：[1]奇瑞汽车股份有限公司汽车工程技术研发总院,安徽芜湖241009

出　　处：《计算机辅助工程》2016年第1期15-18,24,共5页Computer Aided Engineering

摘　　要：采用有限元法对汽车前舱盖进行开关疲劳寿命预测分析.基于Abaqus/Expicit,采用直接积分法对前舱盖进行瞬态响应分析,得到前舱盖在关闭过程中的应力时间历程;运用雨流计数法得到离散的应力循环,采用平均应力修正法得到当量应力谱;根据Miner线性疲劳累积损伤理论预测前舱盖疲劳寿命和风险位置.优化改进后的前舱盖结构通过试验验证.The opening and closing fatigue life of an automobile hood is predicted and analyzed by finite element method. Based on Abaqus/Explicit, the transient response is analyzed for the hood using direct integration method, and the time history of hood stress during closing is obtained; the discrete stress cycles are obtained by rain-flow counting method, and the equivalent stress spectrum is achieved by mean stress modification algorithm; according to the Miner linear fatigue damage cumulative theory, the fatigue life and the risk region of the hood are predicted. The optimized hood structure is verified by test.

关 键 词：汽车 前舱盖 有限元法 直接积分法 瞬态响应 疲劳寿命 

分 类 号：U463.83[机械工程—车辆工程]