摘要
为了研究应用于轨道车辆车体结构的镁合金材料疲劳特性,提出了一种新的疲劳寿命预测模型改进方法。首先,将Bootstrap自助法与最小二乘法相结合,对数据样本进行重抽样,并统计分布特征。其次,依托于应用在轨道车辆上的镁合金,进行单周拉伸试验和高周疲劳试验,得到一系列应力水平-疲劳寿命(S-N)试验数据。最后,通过改进前和改进后的最小二乘法对试验数据进行拟合,得到4种不同存活率下的S-N曲线。结果对比发现,通过改进方法得到的疲劳寿命预测模型对试验数据的拟合优度更好,稳定性及准确性更高。
In order to study the fatigue characteristics of magnesium alloy material applied to the body struc-ture of rail vehicles,a new method to improve the fatigue life prediction model is proposed.First,the Boot-strap method is combined with the ordinary least square to resampling the data samples and statistics the distri-bution characteristics.Then,a series of test data of stress level-life(S-N)were obtained through single-cy-cle tensile test and high-cycle fatigue test,relying on the magnesium alloy applied to the rail vehicle.Finally,the S-N curves at four different survival rates were obtained by fitting the test data with improved pre-and im-proved ordinary least square.The results show that the fatigue life prediction model obtained by the improved method has better fitting advantage,stability and accuracy.
作者
阎帅
张哲
王悦东
臧兰兰
任嘉名
董祺
YAN Shuai;ZHANG Zhe;WANG Yuedong;ZANG Lanlan;REN Jiaming;DONG Qi(Urban Railway Development Department,CRRC Dalian Co.,Ltd,Dalian 116021,China;School of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian 116028,China)
出处
《大连交通大学学报》
CAS
2023年第3期27-33,共7页
Journal of Dalian Jiaotong University
基金
中国中车科技研究开发计划资助项目(2020CKB287)。
