基于临界平面法的发动机机体疲劳寿命预测研究  

Engine Body Fatigue Life Prediction Based on Critical Plane Method

作　　者：陈晓平[1,2] 李京鲁 季炳伟 陈文华[2] 胡如夫[1] 

机构地区：[1]宁波工程学院机械工程学院,宁波315016 [2]浙江理工大学机电产品可靠性技术研究浙江省重点实验室,杭州310018 [3]潍柴动力股份有限公司杭州分公司,杭州310012

出　　处：《内燃机工程》2015年第5期122-127,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51305215)

摘　　要：基于临界平面法计算分析了发动机机体疲劳破坏薄弱位置、疲劳极限和疲劳寿命曲线,并进行了试验验证。结果表明:基于临界平面法进行有限元分析得出的疲劳危险点与疲劳试验试件破坏断裂部位一致;计算得到机体疲劳极限载荷值与试验样本母体均值的相对误差小于10%;计算得到的疲劳寿命与试验疲劳寿命落在3倍误差带以内。在计算模型的边界条件、载荷选取与试验工况一致的前提下,采用临界平面法能准确预测发动机机体疲劳寿命。Based on the critical plane approach, the weak points, ultimate fatigue strength and S-N curve of the vehicle engine were analyzed with the verification tests. The results show that the fatigue critical points obtained from the finite element analysis based on the critical plane approach are consestent with the frature areas of fatigue test specimens. The ultimate fatigue strength calculated from the analytical method has less than 10% of deviation from the test results with fatigue life deviation within 3-time error zones. Therefore, it is suggested that with the same boundary conditions and loading, the critical plane method could accurately predict the vehicle engine body fatigue life.

关 键 词：内燃机 临界平面法 发动机机体 疲劳寿命预测 试验验证 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]