The feature of macro-profile is analyzed, and the crack initiation and extending mechanism of brake disc is discussed.
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。
According to the mode of crack propagation the mechanism of crack initiation and propagation was also discussed.
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。
The micro wear mechanism for PEN is plastic flow and broken of the fiber structure, while that for PI is crack initiation, extending and block fracture.
PEN薄带的微观磨损机理主要是纤维组织的塑性流动和拉断，而PI薄带的微观磨损机理为裂纹的萌生、扩张和块状剥落。
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