铜铝复合接触线用银铜合金疲劳试验

Low Cycle Fatigue Behavior of Cu-Ag Alloy for Cu Cladding Al Contact Wire

通过采用不同应变幅控制,对不同变形量冷拉银铜合金进行室温低周疲劳试验。结果表明,随着应变幅的增大,滞后环面积也随之增大;随着循环周次的增加,循环应力逐渐降低,从而产生疲劳软化;加工率为38%的银铜合金循环周期大于加工率为19%的银铜合金循环周期;试样断裂后存在三个明显疲劳特征区:裂纹源、裂纹扩展区、瞬断区;银铜合金的裂纹扩展具有穿晶和沿晶两种方式。

Low cycle fatigue behavior of Cu-Ag alloy for Cu cladding Al contact wire was tested by using different strain amplitude control with varied deformation rate.The results reveal that with increasing in strain amplitude,area of hysteresis loop is increased.With increasing in cycling times,cycling stress is gradually decreased to lead to the appearance of fatigue softening.The cycling period of Cu-Ag alloy with 38% deformation rate is higher than that of one with 19% deformation rate.The fracture morphology of the alloy is composed of crack,crack propagation and rupture.The crack propagation of the Cu-Ag alloy is characterized by transgranular and along-grain model.