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Initiation Mechanics of Fatigue Crack at Weld Joint of High Strength Bridge Steel
Author(s): 
Pages: 25-27
Year: Issue:  19
Journal: Hot Working Technology

Keyword:  高强度桥梁钢焊缝疲劳位错;
Abstract: 利用高频疲劳试验机研究高强度桥梁钢焊缝金属在不同应力循环次数下位错形态的变化,揭示高强度桥梁钢焊接接头疲劳裂纹的萌生机理.结果表明:高强度桥梁钢焊缝金属随着疲劳载荷下循环次数的增加,依次形成位错纠结→位错墙→位错胞→亚晶,亚晶界开裂从而形成裂纹.
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