短裂纹阶段，疲劳裂纹以角裂纹的形式向内扩展；
In the steady propagating stage, the fatigue crack extended in a toughness tearing way of crystal penetrating.
疲劳裂纹的形成是该阶段最重要的特征。
The formation of fatigue cracks became the most important features in this stage.
对于蠕变裂纹扩展的分析研究还是处于初期阶段，还有许多事情有待于认识和完成。
The analytical investigation of nonlinear creep crack growth is in its infancy and much remains to be learned and done .
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