在第二个临界载荷下，三个判据都满足的区域相互重叠，解理裂纹形核并扩展。

Under the second critical load, the regions, where the three criteria are satisfied, are overlapped each other and cleavage crack is nucleated and propagates.

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为了减少多边形之间重叠性判断的计算量，在本文中采用了临界多边形算法，并对现有的临界多边形算法提出了改进。

To reduce calculation of overlapping judgement, algorithm of no-fit polygon is employed to guarantee that shapes are not overlapping in the paper, and existing algorithm of no-fit polygon is improved.

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给定两个可能相互重叠的凸多边形。

Given two convex polygons, they may or may not overlap.

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