With the assumption that the sites of fracture nucleation are randomly distributed in the sample, we deduce out a set of enclosed equations for predicting the fragment number and size distribution.
同时，假设断裂成核点随机分布于样品中，依据统计原理导出了一组完备的方程组，由此从理论上给出了碎片的数目及其大小分布关系式。
The crack nucleation energy and the propagation energy were measured under impact and tensile testing. The fracture surface was examined by SEM.
测定了析出相的类型和组成，测试和计算了冲击、拉伸状态下裂纹的形核能与扩展能，并通过SEM研究了断面形貌。
The stress whitening can be clearly seen on the fatigue fracture surface and its region is the initiation and nucleation of fatigue crack which is the main part of total fatigue life.
疲劳断口有应力发白现象；应力发白区为疲劳裂纹形核和萌生区，其寿命占疲劳总寿命的大部分；
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