After first crack ends there is usually a period of about one minute before second crack begins.
在一爆结束后,一般有个阶段大概有1分钟,是在二爆前。
The second crack is a crack originating at the groove weld toe of the column flange-girder flange connection.
第二种是产生于立柱翼缘与主梁翼缘连接处的坡口焊缝焊趾处的裂纹。
The fractography of the fatigue crack initiation displayed cleavage facet and more second cracks after pre-training.
裂纹形成的断裂为穿晶解理机制,预应变可导致更多的二次裂纹。
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