摘要
针对典型承受高、低周双频复合载荷的水轮机叶片、电机转子用钢进行了低周疲劳、高低周双频复合疲劳的裂纹萌生及扩展规律的探讨。在频率比确定的条件下,载荷比是影响双频疲劳裂纹萌生及扩展的一个重要因素。随着载荷比的升高,疲劳裂纹萌生寿命大大缩短,裂纹扩展速率加快,疲劳断口呈现明显的周期特征。高、低周双频复合疲劳载荷各自的独特作用以及高、低周载荷在裂纹尖端引起的塑性区的交互作用是造成疲劳断口独特形貌的主要原因。
The Initiation and propagation of fatigue crack under low cyclic fatigue and double forequency complex fatigue have been investigated in 0Cr13Ni6Mo and 26Cr2Ni4MoV steels. On constant frequency ratio, loading ratio has an importance influence on the initiation and propagation of fatigue crack under double frequency complex loading. The bigger loading ratio is, the shorter life of crack initiation is, and the faster speed of crack propagation is. Cyclic properties were occurred clearly on fatigue fracture, which result from high and low cyclic fatigue loads and their each other's actions.
出处
《机械强度》
CAS
CSCD
北大核心
1993年第1期29-33,共5页
Journal of Mechanical Strength
