考虑耦合损伤的高低周复合疲劳寿命预测模型  

COMBINED HIGH AND LOW CYCLE FATIGUE LIFE PREDICTION MODEL TAKING ACCOUNT OF COUPLED DAMAGE

作　　者：刘朋帅 王晓玮 侯军 LIU PengShuai;WANG XiaoWei;HOU Jun(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《机械强度》2024年第5期1175-1183,共9页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(52005319);上海市青年科技英才扬帆计划(20YF1415400)资助。

摘　　要：燃气轮机叶片等机械零部件在工作过程中常受到由低频离心力导致的低周疲劳和由高频振动引起的高周疲劳的共同作用,高低周复合疲劳损伤是其发生破坏的重要因素之一。高低周复合载荷条件下产生的损伤不再是简单的损伤叠加,还需要考虑高周载荷和低周载荷交互作用产生的耦合损伤。在Miner理论的基础上考虑高低周复合载荷引起的耦合损伤,建立高低周复合疲劳寿命预测模型。经过实验验证,对比所提出的模型与Miner模型、Trufyakov-Kovalchuk模型的预测效果,结果表明,提出的模型有较好的预测精度。Mechanical parts such as gas turbine blades are often subjected to low cycle fatigue caused by low⁃frequency centrifugal force and high cycle fatigue caused by high⁃frequency vibration loads during the working process,and the damage caused by the combined cycle loadings is one of the important factors for fatigue.The damage generated under the combined high and low cycle loading is not a simple damage superposition,and the coupled damage due to the interaction of high and low cycle loading also needs to be considered.On the basis of Miner′s rule,through considering the coupled damage caused by the interaction between high and low cycle loading,combined high and low cycle fatigue life prediction model was established.The proposed model was compared with the Miner model and the Trufyakov⁃Kovalchuk model through the material test data.The results show that the proposed model has a good prediction accuracy.

关 键 词：高低周复合疲劳 耦合损伤 疲劳寿命 低周疲劳 高周疲劳 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]