根据裂纹扩展方式的变化，对氢致裂纹萌生和扩展机制进行了讨论。

According to the mode of crack propagation the mechanism of crack initiation and propagation was also discussed.

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分析了制动盘裂纹剖面的宏观形貌特征，并对制动盘裂纹萌生和扩展机理进行探讨。

The feature of macro-profile is analyzed, and the crack initiation and extending mechanism of brake disc is discussed.

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利用三维有限元模拟和动态响应试验对点焊接头疲劳裂纹萌生和扩展特性进行了研究。

Fatigue crack characteristics are investigated based on the dynamic response simulation by finite element and the dynamic response experiments for tensile-shear spot-welded specimens.

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