缺口对车轴钢疲劳性能的影响  

Experimental Research on the Effects of Notches on the Fatigue Behavior of Axle Steel

作　　者：张俊清[1] 周素霞[2] 谢基龙[1] 

机构地区：[1]北京交通大学轨道车辆结构可靠性与运用检测技术教育部工程研究中心,北京100044 [2]北京建筑工程学院机电与汽车工程学院,北京100044

出　　处：《北京交通大学学报》2010年第4期132-135,共4页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"973"计划项目资助(2007CB714705)

摘　　要：采用钼丝进行线切割,制作了车轴钢表面缺口试样,运用有限元方法,计算了不同缺口的理论应力集中系数,通过旋转弯曲试验得到光滑试样和缺口试样的疲劳寿命(S-N)曲线,研究了不同缺口应力集中系数下车轴钢的参数变化规律.结果表明,缺口对材料疲劳寿命的影响,不仅仅表现在其S-N曲线相对于光滑试样S-N曲线整体下降,而且不同缺口S-N曲线左段的直线部分斜率也是不同的.The surface notches samples of axle steel are made by cutting with molybdenum thread and the theory stress concentration factors of different notches are obtained by finite element method. Then the S-N curves of smooth and notched samples are acquired through rotary bending tests and the pa- rameter change rules are studied under different stress concentration factors. It shows that the S-N curves of notched samples are lower than smooth ones on the whole, and the slopes of the left curves on the S-N curves are different also.

关 键 词：车轴钢 表面缺口 理论应力集中系数 S-N曲线 

分 类 号：TG113[金属学及工艺—物理冶金] O346.2[金属学及工艺—金属学]