这种形貌特征有助于判别加载方式的类别，明确铸铁断裂的机理，是失效分析的重要手段。
The characteristics of morphologies are helpful to judging loading mode sort, defining fracture mechanism of cast iron, so they are important means for the failure analysis.
指出了疲劳失效分类以及疲劳裂纹的产生、扩展和断裂机理。
It points out that the classification of fatigue failure and the mechanism of fatigue cracks, expansion and fracture.
在众机理中，主要是：腐蚀失效、环境断裂失效、变形失效和断裂失效。
They are mainly corrosion failure, environment fracture failure, distortion failure and fracture failure.
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