高强度桥梁钢焊缝疲劳裂纹萌生机理的研究
Initiation Mechanics of Fatigue Crack at Weld Joint of High Strength Bridge Steel
贾坤宁, 王海东, 姜秋月
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作者单位：（长春工程学院 机电工程学院，吉林 长春 130012）
中文关键字：高强度桥梁钢；焊缝；疲劳；位错
英文关键字： high strength bridge steel; weld; fatigue; dislocation
中文摘要：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?邛位错墙?邛位错胞?邛亚晶，亚晶界开裂从而形成裂纹。
英文摘要：The dislocation shape alteration at weld joint of high strength bridge steel was studied at different fatigue cycle index. The results show that the dislocation changed as follows with the increase of cycle index, dislocation tangle?邛dislocation wall formed ?邛dislocation cell formed?邛subgrain formed. Then the crack developes when the subgrain boundary split.