某型船用铝-钢复合过渡接头焊接态疲劳性能试验研究

Fatigue Performance Test Research on Transition Welded Joint of Marine Aluminum-Steel Composite Plate for Ship of a Certain Type

针对某型船用铝-钢复合过渡接头应用的要求,对铝-钢过渡接头焊接态疲劳性能进行检测并用扫描电镜对断口进行试验分析。结果发现,在应力值80 MPa^196 MPa范围内,经过2×106次的弯曲疲劳试验,均未发生断裂现象,该应力值已完全满足设计要求;当应力值达到224 MPa时,疲劳寿命已不能满足设计要求;通过对断口分析确定铝-铝界面漩涡边缘的空洞为裂纹源。

Fatigue performance tests on the transition joint of the aluminum and steel clad plate for ship of a certain type were carried out according to the application requirements. Results showed that the transition joint didn＇ t fracture for 2 × 106 cycles when the stress value was within 80 ~ 196 MPa,showing that the stress value could meet the designing requirements. When the stress value reached 224 Mpa,the fatigue life couldn＇t meet the designing requirements. Through the analysis of SEM images of the fractures,the holes along the edges of the eddies in the Al-Al interface were confirmed as the source of fracture.