焊接金属疲劳裂纹萌生寿命估算方法的研究  

THE ESTIMATE METHOD OF FATIGUE CRACK INITIATION LIFE IN WELDED METAL

作　　者：杨化仁[1] 

机构地区：[1]沈阳大学,沈阳110044

出　　处：《力学与实践》2004年第3期20-22,共3页Mechanics in Engineering

摘　　要：疲劳裂纹萌生阶段在整个疲劳破坏过程中占有极为重要的地位,而萌生阶段的裂纹体损伤规律用长裂纹断裂力学方法是无法确定的。以萌生阶段中塑性滞回能作为控制参量,根据实验数据拟合出疲劳损伤的连续曲线,得到裂纹萌生寿命估算公式。Fatigue crack initiation is an important period in the whole fatigue life. The crack initiation period can- not be estimated with fracture mechanics, which is used for large cracks. In this paper, the crack initiation life es- timate equation is deduced by using the fatigue damage continuous curve with the basis of experimental data ob- tained from the crack initiation plastic hysteresis energy as a control parameter.

关 键 词：疲劳裂纹 塑性滞回能 金属焊接 焊缝分析 

分 类 号：TG405[金属学及工艺—焊接]