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建立了对接熔透焊缝连接在疲劳荷载作用下的断裂力学计算模型 ,计算连接在疲劳荷载作用下不同阶段的裂纹扩展速率 ,分析存在不同尺寸偏差的连接的疲劳强度 (寿命 ) ,得出了尺寸偏差对熔透焊缝连接疲劳强度 (寿命 )的影响 ,可评估已建钢结构熔透焊缝连接在疲劳荷载作用下的疲劳强度 (寿命 ) ,控制新建结构熔透焊缝连接的尺寸偏差。
The fracture mechanics calculation model of butt-welded joint under fatigue load was established. The crack growth rate at different stages of connection under fatigue load was calculated. The fatigue strength (life span) of the joints with different size deviations was analyzed. Dimensional deviation on the fatigue strength (life) of welded joints can assess the fatigue strength (life) of welded joints of constructed steel structures under fatigue load and control the dimensional deviation of the welded joints of new structures .