摘要
针对铝合金轮毂的疲劳寿命预测问题,提出考虑损伤累积的轮毂疲劳寿命预测模型并进行试验研究。建立了轮毂在弯曲疲劳试验、径向疲劳试验的有限元模型,通过仿真分析研究了轮毂的主要失效模式;采用名义应力法分别建立了轮毂材料S-N曲线、零件S-N曲线,并利用莫罗直线对轮毂承受的非对称循环载荷进行平均应力修正;考虑轮毂的旋转过程,采用线性累积损伤理论构建了轮毂疲劳寿命预测理论模型。以某型号铝合金轮毂为例,采用理论模型计算得到轮毂的寿命为44.82万转,与弯曲疲劳试验给出的疲劳寿命47.33万转相比,误差约为5.6%,验证了疲劳寿命预测理论模型的有效性。
Aiming at the problem of fatigue life prediction of aluminum alloy wheel hub,a fatigue life prediction model considering damage accumulation is proposed and tested.The Finite Element Models of a wheel hub under bending fatigue test and radial fatigue test are established,and the main failure positions are studied by simulation analysis.The S-N curves of material and part are established by using the nominal stress method,and the average stress of the asymmetric cyclic load borne by the wheel hub is corrected by using the Morrow line.Considering the rotation process of the wheel hub,a theoretical model for predicting the fatigue life is constructed by using the linear cumulative damage theory.Taking an aluminum alloy wheel hub as an example,the life calculated by the theoretical model is 448.2 thousands revolutions.Compared with the fatigue life of 473.3 thousands revolutions given by the bending fatigue test,the error is about 5.6%,which verifies the effectiveness of the fatigue life prediction theoretical model.
作者
王朝华
吴凤和
刘加亮
连辉
WANG ZhaoHua;WU FengHe;LIU JiaLiang;LIAN Hui(College of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China)
出处
《机械强度》
CAS
CSCD
北大核心
2023年第4期970-976,共7页
Journal of Mechanical Strength
基金
国家重点研发计划项目(2020YFB1711803)
山西省高等学校科技创新项目(2021L291)
河北省高等学校科学技术研究重点项目(ZD2020156)资助。
关键词
轮毂
疲劳寿命
损伤累积
弯曲疲劳试验
Wheel hub
Fatigue life
Damage accumulation
Bending fatigue test
