圆缺口试样的疲劳启裂和低周疲劳寿命研究  

An Analysis of Fatigue Crack Initiation and LCF Life in Notched Bars

作　　者：季冲平[1,2] 郭晓民[1,2] 蒋瞻[1,2] 

机构地区：[1]上海铁道大学土木系 [2]南京林业大学

出　　处：《上海铁道大学学报》1998年第8期9-13,共5页

摘　　要：通过对３５ＣｒＭｏ材料的不同缺口半径下缺口试样的低周疲劳试验研究，得出缺口半径、载荷水平会影响缺口试样疲劳裂纹的形成和扩展的结论，并通过有限元分析和对各控制参数的比较，说明在多轴应力应变状态下，用局部等效应变能密度法能有效地进行缺口构件的低周疲劳寿命描述。Experimental studies have been done on the LCF fatigue for notched bars of 35 CrMo in various notch radius.The effects of notch radius and load levels on fatigue crack initiation and propagation behaviors are analyzed.As analyzed with finite element calculation and compared with different methods,the LESED approach is effective for describing the LCF life curve of the various radius notched bar and reliable for predicting the LCF life of the notched bars from LCF curve of the smooth bars.

关 键 词：疲劳寿命 疲劳裂纹 缺口试样 35CrMo材料 

分 类 号：TB302.3[一般工业技术—材料科学与工程]