起重机用Q355钢母材与焊接接头试件拉压扭转疲劳性能研究  

Study on tensile,compressive and torsional fatigue performance of Q355 steel base material and test piece of welded joint for crane

作　　者：杨军斌 罗振坤 刘浩[3] 张雷 康笃刚 Yang Junbin;Luo Zhenkun;Liu Hao;Zhang Lei;Kang Dugang

机构地区：[1]重庆市特种设备检测研究院,重庆401121 [2]国家市场监管重点实验室(西部复杂环境机电设备安全),重庆401121 [3]重庆大学航空航天学院,重庆400044

出　　处：《起重运输机械》2023年第3期71-76,共6页Hoisting and Conveying Machinery

摘　　要：文中选取4级应力水平,在应力比R=-1的情况下开展Q355钢母材和焊接接头试件的单轴拉压及扭转疲劳试验,每级应力下进行3个试样,得到不同应力水平的疲劳寿命,绘制出不同加载条件下的应力-寿命(S-N)散点图。另外,分别采用Basquin模型、指数模型和三参数幂函数模型对S-N散点进行分析,得到不同模型对于试验数据的拟合结果,为材料的工程应用提供了参考依据。Four stress levels were selected,and uniaxial tension-compression and torsional fatigue tests of Q355 steel base material and test piece of welded joint were carried out with the stress ratio of r=-1.Three test species were tested under each level of stress,and the fatigue life of test species under different stress levels was obtained for drawing stress-life(S-N)scatter plots under different loading conditions.In addition,Basquin model,exponential model and three-parameter power function model were adopted to analyze the S-N scatter points to obtain the fitting of the test data of different models,which provides a reference for the application of materials in engineering.

关 键 词：起重机 焊接接头试件 拉伸疲劳 扭转疲劳 S-N曲线 

分 类 号：TH215[机械工程—机械制造及自动化] TG407[金属学及工艺—焊接]