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。

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The fatigue crack growth rate is the core for predicting fatigue life by use of fatigue crack propagation (FCP) theory.

疲劳裂纹扩展率表达式是采用疲劳裂纹扩展理论预报疲劳寿命的核心。

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Size of reinforcement bar significantly affected the fatigue life of materials, the larger the matrix space can make more resistance to crack propagation.

增强柱的尺寸对材料疲劳寿命影响较大，较大的基体空间可以为裂纹扩展增加更多的阻力。

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