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1·The crack propagation path follows some regularity on the whole.

裂纹扩展路径总体上遵循一定的规律。

2·In this paper, the fractal effect of crack propagation path on the fatigue behaviors is studied.

研究了分形裂纹扩展对材料疲劳行为的影响。

3·The fatigue crack initiation life for pipeline connection assemblies is also predicted. The fatigue crack propagation path is analyzed and the fatigue crack propagation life is predicted.

进一步，预估了管路连接件裂纹萌生寿命，预测了裂纹扩展路径并预估了疲劳裂纹扩展寿命。

4·Micro characteristic of cracks propagation research: the path of crack propagation in the heat-affected zone and weld metal is the mix of transgranular and intergranular.

裂纹扩展的微观特征研究：在热影响区与焊缝区的裂纹扩展均为沿晶与穿晶混合型。

5·Statistical analysis of density field was quantified at mesoscale level, including interior, adjacent region, path of propagation of the crack and towards both sides of crack.

细观统计结果表明，裂纹区域和邻近区域的密度要低于正常区域的密度，材料内部的疲劳损伤呈现不均匀性。