2A70铝合金应变疲劳全寿命预测模型  

STRAIN FATIGUE LIFE PREDICTION MODEL OF 2A70 ALUMINUM ALLOY IN THE FULL LIFE RANGE

作　　者：张军海 景国玺 刘烨 张文凯 武一民[1,2] 陈升 ZHANG JunHai;JING GuoXi;LIU Ye;ZHANG WenKai;WU YiMin;CHEN Sheng(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles,Tianjin 300130,China;China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]天津市新能源汽车动力传动与安全技术重点实验室,天津300130 [3]中国北方发动机研究所,天津300400

出　　处：《机械强度》2024年第3期736-742,共7页Journal of Mechanical Strength

基　　金：国防科技重点实验室基金项目(61422120301)资助。

摘　　要：针对2A70铝合金在全寿命范围内的疲劳寿命预测问题,开展了2A70铝合金材料拉伸试验、单轴拉压条件下的低周疲劳试验和高周疲劳试验,讨论了全寿命范围内通过应变进行寿命预测的优势,提出了一种应变疲劳全寿命曲线模型,建立了2A70铝合金的应变疲劳全寿命曲线。通过试验结果对本模型以及3种常用模型的参数进行了标定,并对4种模型的预测结果进行了对比分析,结果表明,提出的新模型寿命预测结果均在3倍误差带范围内,平均误差和分散性都较小,寿命预测精度优于其他3种模型,新模型更适合于2A70材料在同样应变比条件下的疲劳寿命预测。Aiming at the problem of fatigue life prediction of 2A70 aluminum alloy in the full life range,carried out the tensile test of 2A70 aluminum alloy material,low⁃cycle fatigue test and high⁃cycle fatigue test under uniaxial tension and compression conditions.Discussed the advantages of life prediction by strain over the full life range.Proposed the strain fatigue full life curve model,and established the strain fatigue full life curve of 2A70 aluminum alloy.Calibrated the parameters of this model and three commonly used models through the test results,compared and analyzed the prediction results of four models.The results show that the life prediction results of the new model proposed in this paper are all within the range of triple error band,the average error and dispersion are small,and the life prediction accuracy is better than the other three models.The new model is more suitable for the fatigue life prediction of 2A70 material under the same strain ratio.

关 键 词：2A70铝合金 应变疲劳 全寿命范围 寿命预测模型 

分 类 号：TG141[一般工业技术—材料科学与工程]