结果表明：原始的萌生裂纹不一定是最后形成宏观贯通破坏的主裂纹。

Numerical simulation results show that initial cracks are not always the leading cracks which result in the ultimate macroscopical perforation failure.

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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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数值模拟结果显示混凝土破坏过程实际上就是微裂纹萌生、扩展、贯通，直到宏观裂纹产生导致混凝土失稳断裂的过程。

The numerical simulation results show that the initiation, propagation and linking each other of crack in concrete samples at mesoscale level produce the macro-failure of concrete samples.

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